Effect of partial replacement of cement with rice husk ash on concrete properties

Abstract

This research work is related to the study of effects on properties of concrete having rice husk ash as cementitious supplementary materials. Total four mixes of concrete were done with varying percentages of rice husk as 6%, 12% and 18%. The tensile, flexural and compressive strengths that contain rice husk ash were determined by testing cubes, cylinders and beams. There was a replacement of 6%, 12% and 18% of rice husk ash in all mixes except the control mix. The concrete's flexural strength with rice husk ash increases at the beginning and at the later age (i.e., 28 days) similar to control mix; however, variation in compressive and splitting tensile strength is negligible. The optimum results are achieved with 6% replacement of cement with rice husk ash. Therefore, it was inferred that rice husk ash could be used as partial replacement of cement in concrete to produce economic concrete.

Analysing the Effect of Cassava Flour as a Mixture on the Physical, Mechanical, and Durability Properties of High-Strength Concrete

“…It is observed that cassava flour contains appreciable amounts of SiO2, Al2O3, and CaO, which can react in the presence of water to produce cementitious hydrated calcium silicates and aluminates, thereby increasing the strength of concrete. Loss on ignition (LOI) for cassava flour was higher than for cement but was within the Tariq et al (2021) [56] specified range of 12%. The chemical and physical characteristics of the superplasticizer are shown in Table 5.…”