IJEP 43(13): 1174-1185 : Vol. 43 Issue. 13 (Conference 2023)
Amrendra Singh*, Rakesh Kumar, P.K. Mehta and Deep Tripathi
Motilal Nehru National Institute of Technology, Department of Civil Engineering, Prayagraj – 211 004, Uttar Pradesh, India
Abstract
Self-compacting concrete (SCC) is a high-flowing concrete that compacts without the use of external energy. Ordinary portland cement (OPC) is often largely substituted in SCC with waste materials or byproducts to enhance its performance. Various SCC mixes including both rice husk ash (RHA) and flyash (FA) in combination for partial substitution of OPC were prepared in this study with the goal of obtaining a sustainable alternative building material. Different M30 grade SCC mixtures were tested for their hardened and fresh characteristics. The substitution levels of OPC by FA were kept between 0-25% and the optimal replacement amount was determined to be 20%. Following that, for each quantity of FA substitution of OPC, various quantities of RHA were used to replace the OPC (0-15%). The fresh characteristics of concrete were evaluated using U-box, V-funnel time, L-box, slump flow and J-ring tests. Flexural, split-tensile and compressive strengths were used to determine the mechanical characteristics. The workability of the SCC mix improves as the FA content increases, whereas the value decreases as the RHA percentage increases. The optimum amount of OPC replacement by dual admixtures was obtained at 25% [FA (20%)+RHA (5%)]. Further, formulae for prediction of different strength parameters were developed for samples exposed to potable water. A microstructural study was also carried out to investigate the changes in the microstructure of different SCC samples exposed to tap water. Ammonium sulphate solutions were used to expose the SCC specimens to study the effect of sulphate on compressive strength and weight change of different SCC mixes.
Keywords
Self-compacting concrete, Flyash, Rice husk ash, Durability
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