Self-Compacting Concrete or Self Consolidating Concrete (SCC) is a highly flowable, stable concrete which flows readily into place, filling formwork without any consolidation and without undergoing any significant segregation. The use of SCC eliminates the need for compaction therefore saving time, reducing labor costs and conserving energy.Fresh SCC must possess the key properties including filling ability, passing ability and resistance to segregation at required levels. The filling ability is the ability of the SCC to flow into all spaces within the formwork under its own weight. Without vibrating the concrete, SCC has to fill any space within the formwork and it has to flow in horizontal and vertical directions without keeping air entrapped inside the concrete or at the surface. Passing ability is the ability of the SCC to flow through tight openings such as spaces between steel reinforcing bars, under its own weight. Passing ability is required to guarantee a homogenous distribution of the components of SCC in the vicinity of obstacles. The resistance to segregation is the resistance of the components of SCC to migration or separation and remains uniform throughout the process of transport and placing.
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.
Presentation on Self Compacting Concrete / SCCAmit Haridas
Presentation describing the typical parameters of SCC, the tests required to conduct SCC and the issues faced when handling SCC.
This is just the slideshow and does not include commentary part of the original lecture.
Self-Compacting Concrete or Self Consolidating Concrete (SCC) is a highly flowable, stable concrete which flows readily into place, filling formwork without any consolidation and without undergoing any significant segregation. The use of SCC eliminates the need for compaction therefore saving time, reducing labor costs and conserving energy.Fresh SCC must possess the key properties including filling ability, passing ability and resistance to segregation at required levels. The filling ability is the ability of the SCC to flow into all spaces within the formwork under its own weight. Without vibrating the concrete, SCC has to fill any space within the formwork and it has to flow in horizontal and vertical directions without keeping air entrapped inside the concrete or at the surface. Passing ability is the ability of the SCC to flow through tight openings such as spaces between steel reinforcing bars, under its own weight. Passing ability is required to guarantee a homogenous distribution of the components of SCC in the vicinity of obstacles. The resistance to segregation is the resistance of the components of SCC to migration or separation and remains uniform throughout the process of transport and placing.
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.
Presentation on Self Compacting Concrete / SCCAmit Haridas
Presentation describing the typical parameters of SCC, the tests required to conduct SCC and the issues faced when handling SCC.
This is just the slideshow and does not include commentary part of the original lecture.
This presentation gives an overview on different types of acid attacks on concrete. Mechanism of each attack is discussed with few case studies. Hope it is useful
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
This presentation covers the chemical constituents of Portland cement (PC) and the effects and properties of each of the main and minor compounds that make up the (PC). Their typical ranges in PC and in various types of PC. (edited)
Popular as Building material.
Material with adhesive and cohesive properties.
To bind the fine and corse aggregate together.
Common variety of cement is known as the Portland cement.
India is the fifth largest producer of cement in the world.
Rajasthan is the second largest producer of cement in india after Andra Pradesh.
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.
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.
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
This presentation gives an overview on different types of acid attacks on concrete. Mechanism of each attack is discussed with few case studies. Hope it is useful
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
This presentation covers the chemical constituents of Portland cement (PC) and the effects and properties of each of the main and minor compounds that make up the (PC). Their typical ranges in PC and in various types of PC. (edited)
Popular as Building material.
Material with adhesive and cohesive properties.
To bind the fine and corse aggregate together.
Common variety of cement is known as the Portland cement.
India is the fifth largest producer of cement in the world.
Rajasthan is the second largest producer of cement in india after Andra Pradesh.
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.
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.
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
Impact and Performance of Linen Fiber Reinforced Concrete in Slender ColumnsAJSERJournal
This study was consisted of two phases, revealed the behavior of Self-Compacting Concrete (SCC)
specimens of small-diameter slender column to achieve high quality concrete properties without using concrete
vibrator. The first phase investigated the effect of linen fiber on the rheological properties of SCC using two mixes types:
type I mix: without lime powder, and type II mix: with 20% lime as a replacement of cement content. The linen fiber was
contented of 0, 2, and 4 Kg/m³. In the second phase, the type II mix was used to cast three columns; one with plain SCC
and the other two with 2 and 4 Kg/m³ fiber contents. These columns were cured and cut in a certain manner to obtain 7
cylinders 150 × 300 mm and 8 slices 20 mm thickness. The cylinders were used to measure the distribution of unit
weight, compressive strength, and ultrasonic pulse velocity (UPV) along the column height. The rheological properties
of SCC were reduced with the additives of fibers to the mix constituents, but the properties of Fiber reinforced SelfCompacted Concrete (FSCC) were tested at 4 Kg/m³ fiber content. The distribution of unit weight, compressive strength,
and UPV provided good compaction of concrete. Also, the distribution of coarse aggregate at bottom, middle and top
sections of columns were uniformly distributed.
Self-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly fluid nature of SCC makes it suitable for placing in difficult conditions and in sections with congested reinforcement. Use of SCC can also help minimize hearing-related damages on the worksite that are induced by vibration of concrete. Another advantage of SCC is that the time required to place large sections is considerably reduced.
Self-compacting concrete (SCC) is considered as a concrete which can be placed and compacted under its own weight with no vibration.
It is not affected by the skills of workers, the shape and amount of reinforcing bars or the arrangement of a structure.
Due to its high-fluidity and resistance to segregation, it can be pumped longer distances.
It consists of the same components as conventionally vibrated concrete, which is cement, aggregates, and water, with the addition of chemical and mineral admixtures in different proportions.
Usually, the chemical admixtures used are superplasticizers and viscosity-modifying agents.
SCC is especially useful in confined zones where vibrating compaction is difficult.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Study of Boundary Value Analysis in Structural Engineering and Fluid Mechanic...ijtsrd
This paper presents a focused study on properties of porous concrete to widen its application to structural engineering. Mechanical properties like compressive strength, indirect tensile strength, flexural strength and physical properties like density, permeability and porosity are studied. To determine those parameters, twenty seven cubes, cylinders and prisms were tested. Also, three polymer impregnated porous concrete slabs were tested under pure bending moment to study the efficiency of selected resin to integrate particle of concrete to achieve a new generation in using porous concrete in structural engineering. Three different cement content specimens of porous concrete were considered, studied cement contents are 200 kg m3, 300 kg m3 and 400 kg m3. The results show that, increasing the cement content can increase the compressive strength, indirect tensile strength and flexural strength. Density of porous concrete is less than conventional concrete by 21 but permeability factor recorded higher value compared to conventional concrete by sixteen times. Increasing the cement content has no significant effect on either ultimate load or maximum deflection of polymer impregnated porous concrete slabs but the results recorded an achievement to use this concrete in structural engineering applications and give an easy way to cast special concrete like polymer concrete without special tools. Rambha Kumari "Study of Boundary Value Analysis in Structural Engineering and Fluid Mechanics using Homotopy Perturbation" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30516.pdf Paper Url :https://www.ijtsrd.com/engineering/civil-engineering/30516/study-of-boundary-value-analysis-in-structural-engineering-and-fluid-mechanics-using-homotopy-perturbation/rambha-kumari
Code approaches to seismic design of masonry infiled rc framesBinay Shrestha
Masonry infill (MI) increases the initial stiffness of reinforced concrete RC frames. Behavior of MI is difficult to predict because of significant variations in material properties and because of failure modes that are brittle in nature.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
1. Self-Compacting Concrete
Er. Binay Charan Shrestha
SDE, DUDBC
The term Self-Compacting Concrete (SCC) refers to a special type of concrete mixture, characterized
by high resistance to segregation that can be cast without compaction or vibration. This type of high-
performance concrete has been in use only since the late 1980s. The first prototype was developed in
Japan in 1988 as a response to the growing problems associated with concrete durability and the high
demand for skilled workers.
The self-compacting behavior is achieved by adjusting the aggregate content and using a combination
of chemical and mineral admixtures. These admixtures, typically consists of polycarboxylate-based
high-range water-reducing (HRWR, or super-plasticizing) and viscosity-modifying admixtures. Filler
materials are often used for replacing some of the aggregates and modifying the viscosity. High doses
of super-plasticizer produce mix with high fluidity and allow for a reduced water-powder ratio. For the
purposes of SCC, powder can be described as particles smaller than 0.25mm, including some fine
aggregate, cement, fly ash, limestone powder, blast furnace slag, and silica fume. Without a viscosity-
modifying admixture, the mixture would tend to segregate. However, the viscosity-modifying
admixture enhances the viscosity of the mixture, which reduces aggregate segregation, settlement, and
bleeding.
The basic compositions of the self-compacting concrete are essentially similar to the ordinary concrete
except that the proportion of ingredients is varied to improve the workability of SCC. Main
constituents of the SCC include Binder(Cement & fine powder), Water, fine and course aggregates
and Chemical Admixtures. As observed from Figure 1, Self-Compacting Concrete differs from
ordinary concrete mainly with respect to the increase in amount of finer materials and reduction of
course aggregates.
Figure 1 Comparison between SCC and Conventional Concrete.
Before any SCC is produced at a concrete plant and used at a construction site, the mix has to be
designed and tested. A self-compacting concrete mixes must meet three key properties:
1. Ability to flow into and completely fill intricate and complex forms under its own weight.
2. Ability to pass through and bond to congested reinforcement under its own weight.
3. High resistance to aggregate segregation.
2. To achieve these performances, the following three different aspects need to be accomplished:
1. Reduction of the coarse aggregate content in order to reduce the friction, or the frequency of
collisions between them, increasing the overall concrete fluidity.
2. Increasing the paste content to further increase fluidity.
3. Managing the paste viscosity to reduce the risk of aggregate blocking when the concrete flows
through obstacles.
The main characteristics of SCC are the properties in the fresh state. SCC mix design is focused on the
ability to flow under its own weight without vibration, the ability to flow through heavily congested
reinforcement under its own weight, and the ability to obtain homogeneity without segregation of
aggregates. The SCC is characterized by being highly flowable and stable with the following
properties:
o Slump flow > 600 mm
o Remain flowable ≥ 90 minutes
o Withstand a slope of 3%
o Pumpable ≥ 90 minutes through pipes ≥ 100 m long
Laboratory and field tests have demonstrated that the SCC hardened properties are similar to those of
HPC.
SCC compressive strengths are comparable to those of conventional vibrated concrete made
with similar mix proportions and water/cement ratio.
Tensile strengths and the ratios of tensile and compressive strengths are in the same order of
magnitude as the conventional vibrated concrete.
Bond strengths are higher than those of conventional concrete.
Permeability is lesser than similar conventional concrete.
Several test methods have already been developed worldwide to characterize the performance of a
fresh SCC. Among the various test methods only the common tests used for evaluating the compacting
characteristics of fresh SCC are described below.
3. i) Slump Flow Test using the traditional slump cone, is the most common testing method for
flowability. The basic equipment is the same as for the conventional slump test. When the
slump cone has been lifted and the sample has collapsed, the diameter of the spread is
measured (Figure 2). The spread can range from 455 mm to 810 mm.
(a) (b)
Figure 2 Slump Flow Test
ii) Funnel Test: is done to evaluate the material segregation resistance of SCC and viscocity,
using a V-shaped funnel. SCC is allowed to flow through an orifice under its own weight,
and the time taken to drain the content is measured. Usual value of flow time is 8-15
seconds.
(a) (b)
Figure 3 Funnel Test
iii) T50 Test is another test method for evaluating the material segregation resistance of SCC,
whereby the time for the flow to reach 500 mm is measured in the slump flow test.
4. iv) U-Type and L-Type Tests are performed to determine the self-compactability or filling
ability and passing ability of the SCC. These two tests simulate the casting process by
forcing an SCC sample to flow through obstacles under a static pressure (Figure ). Once
the tube is filled with fresh SCC, the sliding door is opened to let flow the concrete to other
chamber. The final height H and H2/H1 for the U-box and the L-box respectively are
recorded. They provide indication on the static and dynamic segregation resistance of an
SCC as well as its ability to flow through reinforcements. They are frequently used in the
field as acceptance test methods. Concrete with the filling height of over 300 mm can be
judged as self-compacting. Acceptable value of the passing ability ratio, H2/H1, is
normally 0.80 - 0.85 but values as low as 0.60 have sometimes been shown to give
acceptable results in the actual structure.
Figure 4 U & L Type Test
The structural design requirements of SCC are no different from those for standard concrete. Existing
codes and standards can be used when designing products using SCC. However, it has been argued
that the fluidity of the mix may increase the hydrostatic pressure on the formwork.
The benefits of using SCC are grouped into two catergories: financial and engineering benefit.
Financial Benefits
1. Labor savings.
2. Placed at a faster rate with no mechanical vibration, resulting in savings in placement costs.
3. Shorter construction periods.
4. Reduced energy consumption from vibration.
5. Reduced wear and tear on forms from vibration.
6. Reduced wear on mixers due to reduced shearing action.
7. Elimination of vibrator noise.
Engineering Benefits
1. Improved architectural surface finish with little to no remedial surface work.
2. Ease of filling restricted sections and hard-to-reach areas. Opportunities to create structural and
architectural shapes and surface finishes not achievable with conventional concrete.
5. 3. Improved consolidation around reinforcement and bond with reinforcement.
4. Improved pumpability.
5. Improved uniformity of in-place concrete by eliminating variable operator-related effort of
consolidation.
6. Increased jobsite safety by eliminating the need for consolidation.
7. Reduced permeability.
8. Superior strength and durability.
SCC does have limitations to consider. One of the most significant limitations concerns the apparent
lack of established reliable test standards that can quantify the physical properties of SCC. In order for
SCC to be accurately specified and to assure quality, uniform standards must exist that can be
accepted and used by those in the industry.