Experimental Study on Strength of Concrete Using Rice Husk Ash

V Abinau¹, G Aswin², A J Godwin³, K Raja⁴, N Ebanezer⁵

^1,2,3,4,5Department of Civil Engineering, Rohini College of Engineering and Technology, India

Abstract

RHA, produced after burning of Rice husks (RH) has high reactivity and pozzolanic property. Indian Standard code of practice for plain and reinforced concrete, IS 456-2000, recommends use of RHA in concrete but does not specify quantities. Chemical compositions of RHA are affected due to burning process and temperature. Silica content in the ash increases with higher the burning temperature. RHA produced by burning rice husk between 600 and 700°C temperatures for 2 hours, contains 90-95% SiO2, 1-3% K2O and < 5% unburnt carbon. RHA contains silica in amorphous and highly cellular form, with 50-1000 m2/g surface area. So use of RHA with cement improves workability and stability, reduces heat evolution, thermal cracking and plastic shrinkage. This increases strength development, impermeability and durability by strengthening transition zone, modifying the pore-structure, blocking the large voids in the hydrated cement paste through pozzolanic reaction. RHA minimizes alkali-aggregate reaction, reduces expansion, refines pore structure and hinders diffusion of alkali ions to the surface of aggregate by micro porous structure.

Keywords

• Query Facets, Extraction, Summarization

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Cite this Article as Follows

V Abinau, G Aswin, A J Godwin, K Raja, N Ebanezer. "Experimental Study on Strength of Concrete Using Rice Husk Ash." International Conference on Advanced Innovations in Engineering and Technology (2017): 09. Print.