Rice Husk Ash Physical Criteria and Properties

Generated From burnt rice husk

· Used As Portland cement Replacement

· Formed during firing process

· Used to accelerate strength in concrete mixtures

Physical Criteria

1. Rate of hydration depends on fineness of cement which affects the development of strength

2. Consist of pure silica, non-crystalline form is highly cellular, very small particles, high specific surface

3. Rice husk ash particles should not be very fine to develop pozzolanic activities.

4. Rate of hydration of RHA is very important to predict its strength development

5. RHA as admixture in cement accelerates the setting time through water absorption from surrounding

6. Slow reactivity because of lower cement content

Physical Properties

· Ability to withstand internal stresses generated during cement hydration , without cracking

Expansion could result in disruption hardened cement paste

· Expansion due to reactions of free lime, magnesia and calcium sulphate can cause slow hydration

Chemical Properties

· Contains of cellulose 40-50 percent, lignin 25-30 percent, ash 15-20 percent and moisture 8-15 percent

· No other plant except paddy husk is able to retain such a huge proportion of silica in it .

Temperature - 550'c - 800'C amorphous silica is formed but at a higher temperatures crystalline silica is produced

Uses Of RHA In Industrial Process

1. Replace to silica fume

2. An admixture in low cost concrete block manufacturing

3. Manufacturing refractory bricks

4. Control of insect pests in stored food stuffs

5. In the vulcanizing rubber

6. In the water purification '

Mechanical Characteristic

In case Of Hardened Concrete

· The compressive strength is lower than the normal concrete

· Indirect Tensile Strength is higher than normal concrete

· Modulus Of Elasticity is similar than concrete containing cement only

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