Rice Husk Ash

Rice Husk Ash is used in concret with many advantages

1. GOVERNMENT COLLEGE OF ENGG. JALGAON seminar on RICE HUSK ASH PRESENTED BY- GUIDE MOHAMAD MUJTABA HARSHA.D.SAPKAL

2. Rice husk ash A valuable green resource with great potential

3. What is Rice husk ash ( RHA) Obtained from burning protecting outer cover of rice husk It consists of non-crystalline silicon dioxide (SiO2) with high specific surface area and high pozzolanic reactivity. The RHA can be found as natural materials, by-products or industrial wastes Chemical propertie so fare closer to micro silica ,silica fime

4. RICE HUSK RICE HUSK ASH

5. HOW RHA PRODUCE Chemical compositions of RHA are affected due to burning process and temperature RHA produced by burning rice husk between 600 to 700°C temperatures for 2 hours

6. Blaine Specific Surface (cm2/g) 13150 Specific Gravity (cm2/g) 2.21 Mean Particle size ( μm ) 10.61 Passing # 325 (%) 95.10         Chemical properties   SiO2 90.16 Fe2O3 0.41 Al2O3 0.11 CaO 1.01 MgO 0.27 SÔ3 0.12 Al2O3 + Fe2O3 0.52 SiO2 + Al2O3 + Fe2O3 0.93 Na2O 0.01 K2O 0.65 Table 1 Physical and Chemical Properties of RHA

7. How RHA improves c oncrete OPC reacts with water to form two products Calcium silicate hydrate :it gives strength and durability to concrete Calcium hydroxide reacts with CO2 causing effloresce It creates negative effects on concrete

8. Addition of RHA 1.Increases calcium silicate hydroxide 2.Decreases calcium hydroxide Ca (OH)2+SiO2=H2O+CaSiO3 The major benefits of the reaction are High strength Reduced efflorescence Reduce sulphate attacks Reduce chemical attacks

9. Uses of RHA RHA can be used in the 2 distinct ways 1)To create HPC –RHA can be added to cement to increase high strength concrete 2)To create Green Concrete-RHA can be used as an substitute to reduce amount of cement with higher strength

10. Carbon credits The production of 1 Tons of cement contributes to 1 tons of co2 in atmos , Worldwide 7% of carbon dioxide emission for production of OPC The utilization of RHA in concrete production is solution to reduce the cement

11. ADVANTAGES Improves compressive strength, flexural strengths and split tensile strength. RHA mixed concrete shows better bond strength as compared to OPC concrete. Permeability of concrete decreases chloride diffusion and chloride permeation reduces (30%) replacement. RHA makes a role to increased resistance to chemical .

12. DISADVANTAGES Suitable incinerator/furnace as well as grinding method is required for burning and grinding rice husk in order to obtain good quality ash. Strength of concrete is reduced for larger (beyond 30%) replacement. There is a little transportation problem. Unburnt RHA is not suitable for concrete production

13. CONCLUSION To study the effect of RHA as substitute for fine aggregate in concrete mixture. The properties of concrete containing RHA had been successfully studied. The use of RHA in civil construction, besides reducing the environmental polluters’ factors, may bring several improvements fotg544r the concrete characteristics.

14. REFRENCE 1.M.S.SHETTY CONCRETE TECHNOLOGY 2.Effect of Rice Husk Ash on Cement Mortar and Concrete. Sudisht Mishra, Prof (Dr.) S. V. Deodhar.   3. Effect of Rice Husk Ash on Lime Stabilization. Dr. J. N. Jha (Member) K. S. Gill 4.Effect of Rice Husk Ash on Cement Stabilized Laterite. MUSA ALHASAN