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SEMINAR REPORT ON REACTIVE POWDER CONCRETE -:Presented By:Subhendu Rana Department of Civil Engineering University Roll no- 10301310058 Haldia Institute of Technology
Introduction •
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A composite material & ultra high strength with mechanical properties. Mixture of fiber reinforced, super plasticized, silica fume, cement & quartz sand with very low water cement ratio. Quartz sand used instead of ordinary aggregate. Therefore increases compressive strength.
COMPOSITION Composition •
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It is composed of similar modulus of elasticity and size increasing homogeneity reducing differential tensile strain. The material having the largest particle size in RPC is the sand. The higher the density, the greater the strength & lower the permeability. Water cement ratio used in RPC ranges from 0.15 to 0.25 Strength more than 200MPa achieved , cured at 90 degree celsious.
Components with function parameters Components •
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Function parameters
Sand
Cement Quartz powder
Silica fume Steel fibers Superplasticiser
Give strength to aggregate Binding material Maximum reactivity during heat-treating Filling the voids Improve ductility Reduce water binding
Properties of RPC 1. COMPRESSIVE STRENGTH
Higher compressive strength than HPC
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It is a factor linked with durability of material.
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Maximum compressive approximately 200MPa. •
strength
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RPC
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2. Flextural Strength •
Plane RPC possess high flextural strength than HPC
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By introducing steel fibers, RPC can achieve high flextural strength.
3. Water Absorption
4. Water Permeability
5. RESI STANCE TO CHLORI DE I ON PENETRATI ON: •
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Increases when heat curing is done in concrete Heat cured RPC show higher value than normal cured RPC.
6. HOMOGENI TY:
Improved by eliminating all coarse aggregates. Dry components for use in RPC is less than 600 micro meter.
7. COMPACTNESS:
Application of pressure before and during concrete setting period. 8. MI CROSTRUCTURE:
Microstructure of the cement hydrate can be changed by applying heat treatment during curing. 9. MATERIAL DUCTILI TY:
Material ductility can be improved through the addition of short steel fibres.
Applications 1. SHERBROOKE PEDESTRAIN BRIDGE
Containment of Nuclear Waste
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Used for isolation and containment of nuclear wastes. It has been used for blocking & stabilization of containment waste.
Benefits
It has the potential to structurally compete with steel.
Superior strength combined with higher shear capacity result in significant dead load reduction.
RPC can be used to resist all but direct primary tensile stress.
Improved seismic performance by reducing inertia load with lighter member.
Low &non-interconnected porosity diminishes mass transfer, making penetration of liquid/gas non-existent.
Limitations of RPC
Least costly components of conventional concrete are eliminated by more expensive elements.
RPC replace steel in compression members where durability issues risk. So long term properties are not yet known.
Conclusion •
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It has immense potential in construction due to its superior, mechanical &durability properties. RPC has ultra dense micro structure , giving advantageous water proofing &durability characteristics.
References •
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Abouzar Sadrekarimi, Development of a lightweight reactive powder concrete, journal of advanced concrete technology, No. 3, vol. 2 A.S.Dili & Manu Santhanam, Investigation on RPC:A developing ultra high strength technology, The Indian concrete journal, A pril 2004. M S Shetty , concrete technology S. Chand & company LTD, Ram Nagar New Delhi. www.wikipedia.org
