REACTIVE POWDER CONCRETE

REACTIVE POWDER CONCRETE

• 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.

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