Abstract

N. Venkata Sairam Kumar^1*, J. Usha Kranti¹, U. V. Narayana Rao²

DOI : http://dx.doi.org/10.13005/ojc/380429

This paper is aimed to present the residual compressive strength of wood ash (WA) concrete cube specimens after immersion in diluted sulfuric acid (H2SO4) solutions. The sulfuric acid resistance of WA concrete is observed using 2% and 5% H2SO4 solutions. WA is used as mineral admixture and the partial substitution levels of WA are 0% (CW0), 5% (CW5), 10% (CW10), 15% (CW15), and 20% (CW20) by weight of 53 grade Portland cement. WA concrete results are compared with the results of M30 grade concrete (CW0). At CW5 and CW10 replacement levels, a slight enhancement in the strength of WA concrete is noticed. No significant resistance to H2SO4 is observed with WA concrete when compared with CW0 concrete. Further, the deterioration of CW0, CW5, and CW10 concrete is similar. The substitution of WA with cement reduces the cement content and eventually gives fewer hydrated cementitious products that enable deterioration by H2SO4. Furthermore, WA helps in improving the density and filling capacity of the interaction transition zone of concrete which leads to the reduction of pores and capillary action. In brief, the use of WA in concrete benefits by converting environmental concern material into a sustainable resource in producing cementing materials.

Acid Attack; Residual Strength; Sustainable Concrete; Sulfuric Acid; Wood Ash

[ View HTML Full Text]