High-performance fiber-reinforced cementitious composites (HPFRCCs) are a group of fiber-reinforced cement-based composites which possess the unique ability to flex and self-strengthen before fracturing. This particular class of concrete was developed with the goal of solving the structural problems inherent with today’s typical concrete, such as its tendency to fail in a brittle manner under excessive loading and its lack of long-term durability. Because of their design and composition, HPFRCCs possess the remarkable ability to strain harden under excessive loading. In layman’s terms, this means they have the ability to flex or deform before fracturing, a behavior similar to that exhibited by most metals under tensile or bending stresses. Because of this capability, HPFRCCs are more resistant to cracking and last considerably longer than normal concrete. Another extremely desirable property of HPFRCCs is their low density. A less dense, and hence lighter material means that HPFRCCs could eventually require much less energy to produce and handle, deeming them a more economic building material. Because of HPFRCCs’ lightweight composition and ability to strain harden, it has been proposed that they could eventually become a more durable and efficient alternative to typical concrete.
HPFRCCs are simply a subcategory of ductile fiber-reinforced cementititous composites (DFRCCs) that possess the ability to strain harden under both bending and tensile loads, not to be confused with other DFRCCs that only strain harden under bending loads.
High performance concrete (HPC) is an engineered concrete that results in a very dense microstructure through careful material selection and a low water-to-binder ratio. HPC bridges provide advantages like reduced maintenance costs, increased durability to withstand environmental conditions, and longer service life. Some examples of notable HPC bridges that demonstrate its construction efficiency and architectural distinction include the Lake Alvord Bridge built in 1889, bridges promoted by the National Concrete Bridge Council using precast segments, and modern landmark bridges like the Hoover Dam Bypass Bridge.
This document discusses high performance concrete (HPC) and ultra-high performance concrete (UHPC), including their mix designs, ingredients, characteristics, advantages, disadvantages, applications, and specific structures where HPC has been used. HPC is designed to achieve higher strength, durability, and workability than conventional concrete through the use of additives like fly ash, slag, and superplasticizers. It has been used in tunnels, bridges, tall buildings, and other structures where high strength and durability are required.
The strength of a material is defined as the ability to resist stress without failure.
It is important to note that High strength and High-performance concrete are not synonymous.
Concrete is defined as High strength concrete on the basis of its compressive strength measured at a given age.
In early 1970’s any concrete mixture that showed 40MPa or more compressive strength at 28 days were design as High strength concrete.
Later 60-100MPa concrete mixture was commercially developed and used in the construction of high rise buildings and long-span bridges in many parts of the world.
high performance concrete by ABHINAV RAWATAbhinav Rawat
High performance concrete (HPC) provides improved strength, durability, workability, and toughness compared to normal concrete. HPC achieves these properties through the use of high-quality cement, supplementary cementitious materials like fly ash and silica fume, and superplasticizers. The main purpose of HPC is to enhance the life of structures by improving impermeability and durability. HPC requires sufficient workability despite very low water-cement ratios, attained through superplasticizers. Strength ranges from 60 to 150 MPa, while improved elastic modulus and dimensional stability counteract undesirable volume changes.
This document provides an overview of high performance concrete (HPC). It defines HPC as concrete with high durability and strength compared to conventional concrete, containing materials like fly ash or silica fume. The document discusses the history, properties, uses, types and limitations of HPC. It explains that HPC is important because it allows for improved structural capacity, durability and reduced costs. HPC provides benefits like early strength, long-term properties and suitability for severe environments.
ultra high performance concrete mix
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A pdf file on High Performance Concrete giving full details about High Performance Concrete, their use,advantages,disadvantages,strength,applications,tensile strength,bridges.
High-performance fiber-reinforced cementitious composites (HPFRCCs) are a group of fiber-reinforced cement-based composites which possess the unique ability to flex and self-strengthen before fracturing. This particular class of concrete was developed with the goal of solving the structural problems inherent with today’s typical concrete, such as its tendency to fail in a brittle manner under excessive loading and its lack of long-term durability. Because of their design and composition, HPFRCCs possess the remarkable ability to strain harden under excessive loading. In layman’s terms, this means they have the ability to flex or deform before fracturing, a behavior similar to that exhibited by most metals under tensile or bending stresses. Because of this capability, HPFRCCs are more resistant to cracking and last considerably longer than normal concrete. Another extremely desirable property of HPFRCCs is their low density. A less dense, and hence lighter material means that HPFRCCs could eventually require much less energy to produce and handle, deeming them a more economic building material. Because of HPFRCCs’ lightweight composition and ability to strain harden, it has been proposed that they could eventually become a more durable and efficient alternative to typical concrete.
HPFRCCs are simply a subcategory of ductile fiber-reinforced cementititous composites (DFRCCs) that possess the ability to strain harden under both bending and tensile loads, not to be confused with other DFRCCs that only strain harden under bending loads.
High performance concrete (HPC) is an engineered concrete that results in a very dense microstructure through careful material selection and a low water-to-binder ratio. HPC bridges provide advantages like reduced maintenance costs, increased durability to withstand environmental conditions, and longer service life. Some examples of notable HPC bridges that demonstrate its construction efficiency and architectural distinction include the Lake Alvord Bridge built in 1889, bridges promoted by the National Concrete Bridge Council using precast segments, and modern landmark bridges like the Hoover Dam Bypass Bridge.
This document discusses high performance concrete (HPC) and ultra-high performance concrete (UHPC), including their mix designs, ingredients, characteristics, advantages, disadvantages, applications, and specific structures where HPC has been used. HPC is designed to achieve higher strength, durability, and workability than conventional concrete through the use of additives like fly ash, slag, and superplasticizers. It has been used in tunnels, bridges, tall buildings, and other structures where high strength and durability are required.
The strength of a material is defined as the ability to resist stress without failure.
It is important to note that High strength and High-performance concrete are not synonymous.
Concrete is defined as High strength concrete on the basis of its compressive strength measured at a given age.
In early 1970’s any concrete mixture that showed 40MPa or more compressive strength at 28 days were design as High strength concrete.
Later 60-100MPa concrete mixture was commercially developed and used in the construction of high rise buildings and long-span bridges in many parts of the world.
high performance concrete by ABHINAV RAWATAbhinav Rawat
High performance concrete (HPC) provides improved strength, durability, workability, and toughness compared to normal concrete. HPC achieves these properties through the use of high-quality cement, supplementary cementitious materials like fly ash and silica fume, and superplasticizers. The main purpose of HPC is to enhance the life of structures by improving impermeability and durability. HPC requires sufficient workability despite very low water-cement ratios, attained through superplasticizers. Strength ranges from 60 to 150 MPa, while improved elastic modulus and dimensional stability counteract undesirable volume changes.
This document provides an overview of high performance concrete (HPC). It defines HPC as concrete with high durability and strength compared to conventional concrete, containing materials like fly ash or silica fume. The document discusses the history, properties, uses, types and limitations of HPC. It explains that HPC is important because it allows for improved structural capacity, durability and reduced costs. HPC provides benefits like early strength, long-term properties and suitability for severe environments.
ultra high performance concrete mix
ultra high performance concrete
high performance concrete mix design
high performance concrete mix
ultra high strength concrete mix
ultra high strength concrete
ultra high performance concrete strength
high performance concrete pdf
A pdf file on High Performance Concrete giving full details about High Performance Concrete, their use,advantages,disadvantages,strength,applications,tensile strength,bridges.
The project was undertaken to design M50 grade concrete using GGBS cement and POZZOLANA cement and comparing the fresh concrete and hard concrete properties with concrete designed using conventional cement.
A STUDY ON HIGH STRENGTH SELF COMPACTING CONCRETE ON EXPOSURE TO VARIOUS TEMP...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in concrete manifests in the form of cracking and
spalling of concrete surface.
High Performance Concrete & Durability of ConcreteAbhal Gudhka
This e-poster by students from A. D. Patel Institute of Technology discusses high performance concrete (HPC) and concrete durability. HPC has improved workability, high strength, and durability. The poster explains factors affecting concrete durability like permeability and chemical attacks. It presents methods to improve durability including using mineral and chemical admixtures. Specifically, fly ash is discussed as an admixture that improves strength, permeability, alkali-silica reaction resistance, and reduces heat of hydration. A case study on a university building that used high volume fly ash concrete is also summarized.
This document provides an introduction to Ultra-High Performance Concrete (UHPC), including its key properties. UHPC has very high compressive and tensile strengths due to its reduced porosity and improved microstructure from the addition of discontinuous fibers. It also has enhanced durability and dimensional stability. Some key properties discussed include UHPC's high compressive strength above 21.7 ksi, tensile strength above 0.72 ksi, lower drying shrinkage compared to normal concrete, and improved resistance to chloride ion penetration and carbonation. In conclusion, UHPC exhibits high strength, dimensional stability, durability and toughness due to its dense microstructure and inclusion of fibers.
High-strength concrete is generally used in the shaping of high-rise structures. It has been used in components of building such as columns (especially on lower floors where the loads will be greatest), shear walls, and foundations. High strengths are also occasionally used in bridge applications as well
High performance concrete (HPC) is a concrete mixture that possesses high durability and strength compared to conventional concrete. HPC contains cementious materials like fly ash or silica fume and superplasticizers that enhance its strength, durability, and workability. HPC can be used where high strength, workability, durability, or improved appearance is needed. It provides benefits like reduced material needs, fewer structural elements, lower maintenance costs, and an extended lifespan, especially in severe environments. However, HPC requires more careful production and quality control than conventional concrete, which can increase costs.
A presentation on High Performance Concrete - High performance concrete is a concrete mixture, which possess high durability and high strength when compared to conventional concrete.
This document summarizes a project report on high strength (M70) and high performance concrete. It lists the project team members and their institution. It then provides details on the properties, methods to achieve, parameters, and material selection for high performance concrete. The document discusses the work done on mix design, laboratory tests, mix preparation, test results and conclusions for M70 concrete.
This document discusses ultra-high performance concrete (UHPC) and its properties and production methods. It describes the materials used in UHPC including cement, silica fume, quartz fines, fine aggregates, and steel fibers. The mixing and curing processes are also outlined. UHPC is shown to have high compressive strength over 150MPa, low permeability, and excellent durability. Its residual flexural tensile strength allows it to be used without conventional reinforcement. While UHPC has great benefits, its high cost currently limits its widespread use. Special applications like precast elements and manhole covers show promise to help reduce costs. Proper mix design and material quality control are needed to achieve UHPC's outstanding mechanical and
1) The document discusses methods for designing high-performance concrete mixes, including the limitations of existing methods like ACI 211-1 which are intended for normal concrete.
2) It proposes a new simplified method that involves selecting the water-to-binder ratio, water content, superplasticizer dosage, coarse aggregate content, and entrained air content in sequence.
3) The key aspects of high-performance concrete that make existing mix design methods inadequate include the ability to independently control slump and water content using superplasticizers, and the need to satisfy requirements like low permeability and high durability in addition to high strength.
This document discusses high-strength concrete (HSC). It defines HSC as concrete with a 28-day compressive strength of over 40 MPa. HSC uses a low water-cement ratio, smaller aggregate sizes, and admixtures like silica fume and superplasticizers. Compared to normal-strength concrete, HSC has higher resistance to pressure, modulus of elasticity, and strength gained at an earlier age. Some applications of HSC mentioned include bridges, high-rise buildings, power plants, and skyscrapers. The document concludes that interest in HSC is growing rapidly due to its advantages like reduced material needs and increased construction speeds.
High-performance concrete provides enhanced properties and performance compared to normal concrete. It is made with specially selected materials and mixture designs to achieve high strength, durability, and other desired characteristics. Common properties of HPC include high early strength, high modulus of elasticity, low permeability, chemical resistance, and resistance to cracking and damage from freezing and thawing or deicing chemicals. HPC is often used in infrastructure projects such as bridges and tunnels where high performance is critical.
This document summarizes research on the structural behavior of high-strength concrete (HSC) columns exposed to fire. It finds that HSC columns experience more spalling than normal-strength concrete columns due to higher pore pressures developing in HSC. The fire resistance of HSC columns is affected by material properties like strength, moisture content, and aggregate type as well as structural factors like member size and reinforcement. Experimental tests showed HSC columns with carbonate aggregate had less spalling than those with siliceous aggregate. Lateral ties also improved fire resistance by limiting column expansion.
Self-compacting concrete (SCC) is a highly flowable concrete that can spread into place and fill formwork without mechanical vibration. SCC has a slump flow ranging from 1 to 32 inches depending on project requirements. It is used to allow faster placement without vibration, improve surface finish, ease placement in restricted areas, and improve consolidation around reinforcement. SCC achieves its flowability through superplasticizers and stability through a higher paste volume, less coarse aggregates, and a higher sand-to-coarse aggregate ratio than conventional concrete. Proper testing ensures SCC does not segregate or bleed once placed.
Concrete is the most widely used construction material in India with annual consumption exceeding 100 million cubic meters.
High performance concrete is a concrete in which certain characteristics are developed for a particular application and environment, so that it will give excellent performance in the structure in which it will be placed.
A high-strength concrete is always a high performance concrete, but a high-performance concrete is not always a high-strength concrete.
This document provides an overview of high performance concrete (HPC). It defines HPC as concrete with high durability and strength compared to conventional concrete, containing cementious materials like fly ash or slag and superplasticizers. The document outlines the history of concrete, properties of HPC like strength and durability, structures it can be used in, and benefits like reduced costs and maintenance needs. It also discusses setting time, durability characteristics, when to use HPC, types of HPC, and limitations before concluding that HPC is crucial for tall buildings due to its strength, durability, and ability to withstand severe environments.
The project was undertaken to design M50 grade concrete using GGBS cement and POZZOLANA cement and comparing the fresh concrete and hard concrete properties with concrete designed using conventional cement.
A STUDY ON HIGH STRENGTH SELF COMPACTING CONCRETE ON EXPOSURE TO VARIOUS TEMP...Ijripublishers Ijri
The extensive use of concrete as a structural material for the high rise buildings, storage tanks, nuclear reactors and
pressure vessels increase the risk of concrete being exposed to high temperatures. This has led to a demand to improve
the understanding of the effect of temperature on concrete. The behavior of concrete exposed to high temperature is a
result of many factors including the exposed environment and constituent materials.
Concrete structures are exposed to fire when a fire accident occurs. Damage in concrete structures due to fire depends
to a great extent on the intensity and duration of fire. The distress in concrete manifests in the form of cracking and
spalling of concrete surface.
High Performance Concrete & Durability of ConcreteAbhal Gudhka
This e-poster by students from A. D. Patel Institute of Technology discusses high performance concrete (HPC) and concrete durability. HPC has improved workability, high strength, and durability. The poster explains factors affecting concrete durability like permeability and chemical attacks. It presents methods to improve durability including using mineral and chemical admixtures. Specifically, fly ash is discussed as an admixture that improves strength, permeability, alkali-silica reaction resistance, and reduces heat of hydration. A case study on a university building that used high volume fly ash concrete is also summarized.
This document provides an introduction to Ultra-High Performance Concrete (UHPC), including its key properties. UHPC has very high compressive and tensile strengths due to its reduced porosity and improved microstructure from the addition of discontinuous fibers. It also has enhanced durability and dimensional stability. Some key properties discussed include UHPC's high compressive strength above 21.7 ksi, tensile strength above 0.72 ksi, lower drying shrinkage compared to normal concrete, and improved resistance to chloride ion penetration and carbonation. In conclusion, UHPC exhibits high strength, dimensional stability, durability and toughness due to its dense microstructure and inclusion of fibers.
High-strength concrete is generally used in the shaping of high-rise structures. It has been used in components of building such as columns (especially on lower floors where the loads will be greatest), shear walls, and foundations. High strengths are also occasionally used in bridge applications as well
High performance concrete (HPC) is a concrete mixture that possesses high durability and strength compared to conventional concrete. HPC contains cementious materials like fly ash or silica fume and superplasticizers that enhance its strength, durability, and workability. HPC can be used where high strength, workability, durability, or improved appearance is needed. It provides benefits like reduced material needs, fewer structural elements, lower maintenance costs, and an extended lifespan, especially in severe environments. However, HPC requires more careful production and quality control than conventional concrete, which can increase costs.
A presentation on High Performance Concrete - High performance concrete is a concrete mixture, which possess high durability and high strength when compared to conventional concrete.
This document summarizes a project report on high strength (M70) and high performance concrete. It lists the project team members and their institution. It then provides details on the properties, methods to achieve, parameters, and material selection for high performance concrete. The document discusses the work done on mix design, laboratory tests, mix preparation, test results and conclusions for M70 concrete.
This document discusses ultra-high performance concrete (UHPC) and its properties and production methods. It describes the materials used in UHPC including cement, silica fume, quartz fines, fine aggregates, and steel fibers. The mixing and curing processes are also outlined. UHPC is shown to have high compressive strength over 150MPa, low permeability, and excellent durability. Its residual flexural tensile strength allows it to be used without conventional reinforcement. While UHPC has great benefits, its high cost currently limits its widespread use. Special applications like precast elements and manhole covers show promise to help reduce costs. Proper mix design and material quality control are needed to achieve UHPC's outstanding mechanical and
1) The document discusses methods for designing high-performance concrete mixes, including the limitations of existing methods like ACI 211-1 which are intended for normal concrete.
2) It proposes a new simplified method that involves selecting the water-to-binder ratio, water content, superplasticizer dosage, coarse aggregate content, and entrained air content in sequence.
3) The key aspects of high-performance concrete that make existing mix design methods inadequate include the ability to independently control slump and water content using superplasticizers, and the need to satisfy requirements like low permeability and high durability in addition to high strength.
This document discusses high-strength concrete (HSC). It defines HSC as concrete with a 28-day compressive strength of over 40 MPa. HSC uses a low water-cement ratio, smaller aggregate sizes, and admixtures like silica fume and superplasticizers. Compared to normal-strength concrete, HSC has higher resistance to pressure, modulus of elasticity, and strength gained at an earlier age. Some applications of HSC mentioned include bridges, high-rise buildings, power plants, and skyscrapers. The document concludes that interest in HSC is growing rapidly due to its advantages like reduced material needs and increased construction speeds.
High-performance concrete provides enhanced properties and performance compared to normal concrete. It is made with specially selected materials and mixture designs to achieve high strength, durability, and other desired characteristics. Common properties of HPC include high early strength, high modulus of elasticity, low permeability, chemical resistance, and resistance to cracking and damage from freezing and thawing or deicing chemicals. HPC is often used in infrastructure projects such as bridges and tunnels where high performance is critical.
This document summarizes research on the structural behavior of high-strength concrete (HSC) columns exposed to fire. It finds that HSC columns experience more spalling than normal-strength concrete columns due to higher pore pressures developing in HSC. The fire resistance of HSC columns is affected by material properties like strength, moisture content, and aggregate type as well as structural factors like member size and reinforcement. Experimental tests showed HSC columns with carbonate aggregate had less spalling than those with siliceous aggregate. Lateral ties also improved fire resistance by limiting column expansion.
Self-compacting concrete (SCC) is a highly flowable concrete that can spread into place and fill formwork without mechanical vibration. SCC has a slump flow ranging from 1 to 32 inches depending on project requirements. It is used to allow faster placement without vibration, improve surface finish, ease placement in restricted areas, and improve consolidation around reinforcement. SCC achieves its flowability through superplasticizers and stability through a higher paste volume, less coarse aggregates, and a higher sand-to-coarse aggregate ratio than conventional concrete. Proper testing ensures SCC does not segregate or bleed once placed.
Concrete is the most widely used construction material in India with annual consumption exceeding 100 million cubic meters.
High performance concrete is a concrete in which certain characteristics are developed for a particular application and environment, so that it will give excellent performance in the structure in which it will be placed.
A high-strength concrete is always a high performance concrete, but a high-performance concrete is not always a high-strength concrete.
This document provides an overview of high performance concrete (HPC). It defines HPC as concrete with high durability and strength compared to conventional concrete, containing cementious materials like fly ash or slag and superplasticizers. The document outlines the history of concrete, properties of HPC like strength and durability, structures it can be used in, and benefits like reduced costs and maintenance needs. It also discusses setting time, durability characteristics, when to use HPC, types of HPC, and limitations before concluding that HPC is crucial for tall buildings due to its strength, durability, and ability to withstand severe environments.
Reactive powder concrete (RPC) is a very strong and durable building material developed in the 1990s. It consists of a finely-ground mixture of cement, silica fume, quartz flour, water and steel fibers that is cured at a high temperature. RPC has extremely high compressive strength, even over 200 MPa, along with high flexural strength and very low permeability. It has been used in bridges, seawalls, buildings and other structures where high strength and durability are required. However, RPC is more expensive to produce than normal concrete due to its specialized composition and processing requirements.
High performance concrete (HPC) is a type of concrete mixture that possesses high workability, high strength, low permeability, and resistance to chemical attack. HPC uses carefully selected, high-quality ingredients and optimized mixture designs to produce concrete with a low water-cement ratio between 0.20 to 0.45. Plasticizers are used to make HPC fluid and workable. HPC exceeds the properties and constructability of normal concrete. It has been used in tunnels, bridges, tall buildings, shotcrete repair, poles, parking garages, and agricultural applications due to its strength, durability, and high modulus of elasticity.
Paste Viscosity!
Attained by one of three means:
High cement content
High content of Fly Ash, Silica Fume etc
Use of Viscosity Modifying Admixture
Also low water content using HRWR
High Performance Concrete PresentationnnNamrataPal15
High performance concrete is a specialized concrete mixture that provides benefits like high strength, durability, and early strength compared to conventional concrete. It contains supplementary cementitious materials and superplasticizers. Some applications of high performance concrete include bridges, high-rise buildings, tunnels, and pavements. Its objectives include early usage and reducing column sizes. Its characteristics are high strength, modulus of elasticity, abrasion resistance, and volume stability. Advantages include longer spans, reduced maintenance, and better long-term performance, while disadvantages include more careful manufacturing and quality control requirements.
This document discusses different types of special concrete and factors that affect the durability of concrete. It describes 10 types of special concrete: 1) light weight concrete, 2) polymer modified concrete, 3) fiber reinforced concrete, 4) high performance concrete, 5) pumped concrete, 6) roller compacted concrete, 7) self-compacting concrete, 8) high density concrete, 9) ready mixed concrete, and 10) green concrete. It also discusses recycled concrete and various methods to improve the durability of concrete structures. The document provides details on the composition, properties and applications of these special concretes.
Introduction and sustainable development in concrete technologyKathan Sindhvad
The document discusses sustainable development practices in concrete technology. It covers several topics:
1. Concrete has high embodied energy due to cement production, but has potential to be efficient over its long lifespan. Supplementary cementing materials and reducing cement content can lower environmental impacts.
2. Concrete's thermal mass allows it to reduce operational energy usage in buildings through passive heating and cooling. It also enables more efficient radiant heating systems.
3. Recycled concrete aggregate can be used in new concrete, reducing waste and costs while maintaining durability. This supports sustainable development goals.
what is polymer concrete, types, properties, material used in manufacturing process , manufacturing process, applications and their advantages. case study on polymer composite concrete.
This document provides information about ready-mix concrete (RMC), including its history, composition, production process, and use in India. Some key points:
- RMC was first developed in Germany in 1903 and introduced in the US in 1913. It involves premixing concrete ingredients off-site and delivering it via transit mixer trucks.
- RMC provides better quality control than on-site mixing and eliminates the need for construction sites to store raw materials. India's first major RMC projects were dams in the 1950s.
- RMC is composed of cement, aggregates like sand and gravel, water, and sometimes admixtures or fly ash. Major companies in India operate over 100 RMC plants
High performance concrete provides improved durability and structural capacity compared to conventional concrete. It has a denser microstructure due to a lower water-cement ratio, making it more impermeable and durable. Various methods can be used to produce high strength concrete, including seeding, revibration, and using admixtures. High performance concrete requires careful material selection and mixing to obtain properties like low permeability, high early strength, and resistance to chemical attack. It is an engineered concrete that achieves optimized performance for given loading and exposure conditions.
High performance concrete provides improved durability and structural capacity compared to conventional concrete. It has a denser microstructure due to a lower water-cement ratio, making it more impermeable and durable. Various methods can be used to produce high strength concrete, including seeding, revibration, and using admixtures. High performance concrete requires different curing than conventional concrete due to its reduced potential for plastic and autogenous shrinkage. It has enhanced strength, ductility, and durability characteristics compared to normal strength concrete.
Here, I attach a PowerPoint presentation created by me for a competition held by UltraTech. Have a look at this and feel free to share your views with me.
Self-compacting concrete (SCC) is a highly flowable concrete that can spread into place and fill formwork without any mechanical consolidation. SCC was developed in Japan in the 1980s to ease construction challenges. SCC consists of the same materials as regular concrete but with optimized proportions and use of chemical and mineral admixtures to improve flowability and prevent segregation. Tests are conducted to evaluate the filling ability, passing ability and resistance to segregation of SCC. While SCC provides benefits like faster construction and improved quality, further research is still needed to fully understand its properties. SCC has been used successfully in large projects in Japan and India.
- High performance concrete (HPC) provides improved durability and structural capacity compared to conventional concrete through enhanced material properties and mixture design.
- Key characteristics of HPC include high strength, improved ductility, and enhanced durability through reduced permeability. Strength is increased using a low water-to-cement ratio, supplementary cementitious materials, and chemical admixtures.
- Proper curing of HPC is important to control autogenous shrinkage during hydration. Water ponding or fogging provides the most effective curing to develop strength and minimize cracking.
the presentation covers the history of SCC, its composition and its comparision with conventionally vibrared concrete.
The presentation was made for ultratech rising star competion and won the third prize in the zone.
This document provides an overview of ready mix concrete (RMC). It discusses that RMC is concrete manufactured at a central batching plant according to a customer's specifications. The key components of an RMC plant include batching plants for mixing materials, transit mixers for transporting concrete, and concrete pumps. Common materials used in RMC include aggregates, cement, fly ash, and water. RMC has applications in foundations, buildings, bridges and more. Advantages include consistent quality, reduced time and waste. Limitations include high initial investment and effective transportation requirements.
International Conference on NLP, Artificial Intelligence, Machine Learning an...gerogepatton
International Conference on NLP, Artificial Intelligence, Machine Learning and Applications (NLAIM 2024) offers a premier global platform for exchanging insights and findings in the theory, methodology, and applications of NLP, Artificial Intelligence, Machine Learning, and their applications. The conference seeks substantial contributions across all key domains of NLP, Artificial Intelligence, Machine Learning, and their practical applications, aiming to foster both theoretical advancements and real-world implementations. With a focus on facilitating collaboration between researchers and practitioners from academia and industry, the conference serves as a nexus for sharing the latest developments in the field.
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODELgerogepatton
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEMHODECEDSIET
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
2. CONTENTS
• INTRODUCTION
• MIX DESIGN OF HPC
• INGREDIENTS OF HPC
• CHARACTERISTICS OF HPC
• ADVANTAGES
• DISADVANTAGES
• APPLICATIONS
3. INTRODUCTION
Concrete is known as most durable and strong material ,Researchers and
experiments made it to greater durable and strong ,This scenario leads to use of the
additive mixtures to improve the quality of concrete.As outcome of the experiments
many different concretes are found ,In which ‘HPC’ and ‘UHPC' are advanced interms of
properties(durability,workability and strength).
American Concrete Institute(ACI) defined HPC as concrete m eet in g special
p e rfo rm a n ce a n d u n i fo r m l y requirements that ca n no t a lw a y s be
achieved routinely conventional concrete.
4. MIX DESIGN OF HPC
CONCRETE MIX
The primary aim of a mix design is to obtain more (or) less required properties of a
concrete.mix design of HPC concrete is different from that of usual concrete.The three
important characteristics of HPC that are kept in mind while Mix designing are
1)Strength
2)Durability and
3)Workability
5. INGREDIENTS USED IN HPC AND WHY:
MATERIAL DESIRED PROPERTY
1)Ordinary portland cement
2)Fly ash
3)Slag
4)Silica fume
5)Superplasticizers 6)Water
reducers
7)Retarders/Accelerators
8)Corrosion inhibitors
-Binding/Strength
-Durability/cost
-Flowability
-reduce w/c ratio
-control setting
-control corrosion
-high strength
1) cement:-
Generally ordinary portland cement is used for mixing HPC and
used cement should be compatible with chemical admixtures.
2)Aggregates:-
Fine aggregate:-Locally available allival sand(medium ,specific gravity =
2.6) is used.
6. - Coarse aggregres:-
- Upto 70MPa comp.strength ,coarse aggregate of maximum size is 20 to 28mm is used.
- For 100MPa comp.strength, aggregate of size 10 to 14mm is used.
- Greater than 125MPa comp.strength 10 to 14 mm size is used.
3)Mineral Admixtures:-
- GGBS,Fly ash and natural pozzolanos, not only reduce cost of concrete,but also addresses the
slump loss problems.
- While silica fume is usually required to attain higher strength to concrete,and gives durableness to
concrete.
4)Water cement ratio: - To attain higher strength for a concrete w/c ratio is to be reduced.But reduction in
w/c ratio makes non workable, to get better workable superplasticizers are used.
- Water cement ratio is vary for different places due to different temperatures,humidity.
9. CHARACTERISTICS OF HPC:-
High-performance concrete characteristics are developed for particular applications and
environments; some of the properties that may be required include:
• High strength
• High early strength
• High modulus of elasticity
• High abrasion resistance
• High durability and long life in severe environments
• Low permeability and diffusion
• Resistance to chemical attack
• High resistance to frost and deicer scaling damage
• Toughness and impact resistance
• Ease of placement
• Compaction without segregation
• Inhibition of bacterial and mold growth.
10. ADVANTAGES
• Reduction in member size, resulting in increase in plinth area/useable area and direct savings in the
concrete volume saved.
• Reduction in the self-weight and super-imposed DL with the accompanying saving due to smaller
foundations.
• Reduction in form-work area and cost with the accompanying reduction in shoring and stripping time
due to high early-age gain in strength.
• Construction of High –rise buildings with the accompanying savings in real-estate costs in
congested areas.
• Superior long-term service performance under static, dynamic and fatigue loading.
• Low creep and shrinkage.
• Higher resistance to freezing and thawing, chemical attack, and significantly improved long-term
durability and crack propagation.
11. Disadvantages:-
The current disadvantages of HPC pointed out by some engineers include:
• The initially higher construction bid prices to be expected with the use of any new technology.
• Quality control concerns related to various material selection, testing methods in use and the
number of tests.
.
12. • APPLICATIONS:-
• High-performance concrete has been primarily used in tunnels, bridges, and tall buildings for its
strength, durability, and high modulus of elasticity (Fig. 17-1). It has also been used in shotcrete repair,
poles, parking garages, and agricultural applications.
• HPC is also used at adverse environment conditions .concrete doesn't easily get corrode or
damaged due to high compaction and low permeability of it.