Experimental Investigation Of Properties Of Fresh And Hardened Concrete With Partial Replacement Of Cement By Hybrid Of Coffee Husk Ash And Rice Husk Ash.

Abstract

This study explores the properties of rice husk ash and coffee husk ash and investigates their potential as partial replacements for cement in concrete production. The aim was to assess the effects of using a combination of rice husk ash and coffee husk ash on both the workability of fresh concrete and the mechanical properties of hardened concrete. Both rice husk ash and coffee husk ash met ASTM C618 standards, fulfilling the chemical compositions and complying with specified limits for loss on ignition, alkali content, and magnesium oxide content. Various combinations were tested, and the highest mechanical properties observed in the mixture containing 15% rice husk ash and 2.5% coffee husk ash. However, partial replacement of hybrid rice husk ash and coffee husk ash led to a reduction in the workability of fresh concrete. These findings demonstrate the potential benefits of incorporating rice husk ash and coffee husk ash as partial replacements for cement in concrete, contributing to sustainable construction practices. Future research can focus on optimizing mixtures to improve both mechanical properties and workability. In summary, this study underscores the promising prospects of utilizing rice husk ash and coffee husk ash to enhance mechanical properties of hardened concrete.