Reactive Powder Concrete
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This document summarizes the composition and properties of reactive powder concrete (RPC). RPC consists of very fine powders of cement, micro silica sand, quartz powder, minimal water, and steel fibers which provide high strength of 200-800 MPa and ductility. It was developed to eliminate flaws in other concretes and uses coarse aggregates. RPC exhibits improved abrasion resistance, lower water absorption and corrosion rates, and reduced chloride diffusion compared to regular concrete. While costly, it is suitable for applications where high strength and weight savings are beneficial, though long-term properties and construction details require more research.
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RPC is an ultra-high strength concrete with improved properties achieved through enhanced homogeneity, compactness, and microstructure. It replaces coarse aggregates with fine powders and optimizes particle packing to increase density. Heat curing activates pozzolanic reactions and improves strength and durability. Steel fibers provide ductility. Two types of RPC exist - RPC 200 which achieves 200 MPa strength, and RPC 800 which uses stainless steel fibers and reaches 800 MPa through high temperature curing and applied pressure.
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Concrete is a widely used construction material consisting of cement, water, and aggregates. The strength of concrete is specified using its 28-day cube strength in N/sq.mm. Formwork is used to mold wet concrete into desired shapes and allow it to cure. Formwork design involves choosing traditional or systematic approaches using wood or steel components like props, beams, sheathing to form columns, walls, and beams until the concrete gains sufficient strength. Proper formwork is important for quality concrete finish and structural integrity.
High Performance Concrete
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.
Presentation on non destructive testing
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Ajm and wjm
Abrasive jet machining uses abrasive particles suspended in a gas or liquid to machine materials through erosion. Key points include:
- Abrasive particles like aluminum oxide or silicon carbide are accelerated to high velocities and directed at a workpiece to erode away material.
- Process parameters like abrasive size and flow rate influence the material removal rate, with larger abrasives providing higher removal.
- Applications include cutting, cleaning, etching, and polishing of brittle materials like ceramics, concrete, and composites that are difficult to machine with traditional methods.
- While allowing machining of hard materials, abrasive jet machining has low material removal rates and issues with stray cutting
Ajmandwjm
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High density concrete, high strength concrete and high performance concrete.
The document discusses high density concrete, its components, types of aggregates used, admixtures, applications, advantages and disadvantages. High density concrete has a density over 2600 kg/m3 and offers greater strength than regular concrete. Its main components are cement, water, aggregates and admixtures. Natural aggregates come from iron ores while man-made aggregates include iron shots, chilcon and synthetic aggregates. Admixtures like water reducers are used to increase workability and reduce cement and water requirements. High density concrete has applications in radiation shielding, precast blocks, bridges and more due to its high strength and durability.
Reactive-Powder-Concrete.pptx
The document discusses reactive powder concrete (RPC), including its composition, properties, applications, advantages, and disadvantages. RPC is an ultra-high strength cement composite developed in the 1990s. It contains cement, silica fume, quartz flour, steel fibers, and superplasticizer. RPC has very high compressive strength of up to 200 MPa due to its dense microstructure and absence of coarse aggregates. It has been used in applications like bridges where high strength and durability are required. Advantages include high strength and reduced weight, while disadvantages include higher material costs. A case study on using RPC for the Qinghai-Tibet Railway in China is also presented.
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The document discusses different types of high-value concrete including high-performance, high-early strength, high-strength, high-durability, self-consolidating, and reactive powder concrete. It provides details on the materials, properties, and characteristics of each type. Reactive powder concrete is able to achieve very high strengths over 200 MPa through an optimized mix design with a very low water-cement ratio, fine particles, and steel fibers. Ductal is a type of reactive powder concrete that offers high strength, ductility, abrasion resistance, and impermeability.
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hvalue.ppt
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This document provides information on different types of concrete, including their compositions and uses. It discusses aggregates, which make up 60-75% of concrete's total volume. It also summarizes different concrete classifications based on strength (ordinary, high-strength, polymer), design (plain cement, reinforced cement), and compaction method (roller-compacted). Additional topics covered include fiber-reinforced concrete, ferrocement, and durability issues like chloride, sulfate, carbonation, alkali-aggregate, and acid attacks.
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Ferrocement is a thin concrete made of cement mortar reinforced with closely spaced layers of wire mesh. It is composed of a matrix of cement mortar reinforced with steel wire mesh. Ferrocement can be formed into various shapes and exhibits high tensile strength and flexibility compared to conventional concrete due to the higher steel-cement ratio. It has applications in marine structures, water and sanitation infrastructure, housing, and agriculture due to properties such as lightweight, durability, and waterproofness.
4. cement
Portland cement concrete is an artificial rock composed of aggregates, water, and a cementing agent like Portland cement. Portland cement is produced by burning and grinding a mixture of limestone, silica, alumina, and iron. The major constituents of Portland cement are compounds like C3S, C2S, C3A, and C4AF that form during burning and fusion and influence properties like strength. Concrete is composed of cement, water, fine aggregate, coarse aggregate, and sometimes admixtures. Admixtures are added during mixing to improve properties and aid construction. Curing protects concrete from moisture loss and temperature extremes to ensure proper strength development.
Ferrocement ppt
Ferrocement is a thin reinforced concrete made of wire mesh and cement mortar. It was introduced in 1943 and offers high strength and flexibility compared to conventional concrete. Ferrocement consists of thin layers of wire mesh embedded in and covered by a sand-cement mortar mix, with a typical ratio of 5% wire mesh to 95% mortar. It can be formed into various shapes by hand or machine and has applications in construction, agriculture, transportation and more due to its strength, versatility and affordability.
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Group presentation 101 firefighting
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ABRASIVE JET MACHINE
Abrasive jet machining is a machining process that uses a high-pressure stream of abrasive particles to erode material from a workpiece. It allows for precision machining of brittle materials with no heat affected zone and surface finishes as fine as 0.4-1.2 micrometers. The process involves mixing abrasive particles with a pressurized gas before passing them through a nozzle to eject them at speeds up to 300 m/s onto the workpiece. Factors like abrasive type, nozzle characteristics, gas pressure and flow rates influence the machining rate, accuracy and surface quality achievable.
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Reactive Powder Concrete
- 3. Need of High Strength and Highly durable concrete. Eliminated flaws of other types of concrete and use of coarse aggregates. Consists of very fine powders of Cement, Micro Silica Sand, Quartz Powder, Minimum Water and Steel fibers for ductility. Typical range of compressive strengths: 200 to 800 Mpa. Developed by P Richards and M Cheyrezy.
- 4. Component s Selection Parameters Function Particle Size Types Sand Good Hardness, Available at low Cost Gives Strength 150-600 microns Natural Crushed Cement C3S: 60%, C2S: 22%, C3A: 3.8%, C4AF: 7.4% Binds Ingredients and produces primary hydrates 1-100 microns OPC Medium Fineness Quartz Powder Fineness Maximum reactivity during Heat treating 5-25 microns Crystalline Silica Fumes Very low impurities Fills voids, produces secondary hydrates 0.1 – 1 micron Highly Refined Steel Fibres Good aspect ratio Improves ductility L: 13-25 mm Dia: 0.15 – 0.20 mm Straight Super Platicizers Less retarding Nature Reduce W/C ratio Polyacrylate
- 5. Abrasive Wear 2.5 times lower Water Absorption 7 times lower Rate of Corrosion 8 times lower Chloride ion diffusion 25 times lower Strength 200-800 Mpa
- 6. Least costly materials replaced by expensive materials. Suitability: Areas where characteristics are fully utilized and weight savings are realized. Long term properties yet to established. Detailed design and Construction aspects not covered in codes.