• 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
• 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 FUNCTIONS PARAMETERS
Components
- Sand
- Cement
- Quartz powder
- Silica fume
- Steel fibers
- Superplasticiser
Function parameters
- 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
• It is a factor linked with durability of material.
• Maximum compressive strength of RPC is approximately 200MPa.
2. FLEXTURAL STRENGTH
• Plane RPC possess high flextural strength than HPC
• By introducing steel fibers, RPC can achieve high flextural strength.
3. WATER ABSORPTION
4. WATER PERMEABILITY
5. RESISTANCE TO CHLORIDE ION PENETRATION
• Increases when heat curing is done in concrete
• Heat cured RPC show higher value than normal cured RPC.
6. HOMOGENITY
• 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. MICROSTRUCTURE:
Microstructure of the cement hydrate can be changed by applying heat treatment during curing.
9. MATERIAL DUCTILITY:
Material ductility can be improved through the addition of short steel fibres.
APPLICATION
1. SHERBROOKE PEDESTRAIN BRIDGE
2. CONTAINMENT OF NUCLEAR WASTE
• 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.