Evaluation of Mechanical Properties of Bentonite Clay Blended Concrete in Rigid Pavement

Abstract

The use of supplementary cementitious materials (SCMs) can enhance concrete properties in rigid pavement, conserve natural resources, and reduce CO2 emissions. However, some SCMs may not meet the escalating demands of the construction industry. This study explores the influence of bentonite clay (BC) as a partial substitute for cement used in rigid pavement, focusing on concrete strength, durability, and microstructure. Six distinct mixtures were formulated, varying BC content 0%, 4%, 8%,12%,16% and 20% by weight as cement replacement. Incorporating Bentonite Clay into concrete blends resulted in significant enhancements in pore structures, as well as increased resistance to sulfate attack and chloride penetration. These modified concrete mixtures are considered viable for use in the construction industry from technical, environmental, and economic perspectives. Environmental impact analysis indicated a potential reduction in carbon emissions compared to control mixtures with Bentonite Clay. Up to a certain fraction of Bentonite Clay addition proved fruitful but exceeding that results negative so finding an optimum amount for use as cement replacement is necessary. Along with numerous advantages, cost reduction also adds in importance of this study