Performance of Self Compacting Concrete Using Bentonite

Abstract

Supplementary Cementitious Materials (SCMs) have the potential to enhance the properties of self-compacting concrete (SCC) while reducing the pressure on natural reserves and CO2 emissions. However, certain SCMs are not able to meet the needs in the construction industry. This research investigates the role of unheated bentonite (BN) clay and its synergistic effect with Ground Granulated Blast Furnace Slag (GGBS) as a partial substitute for cement on performance of SCC. Three different mixtures were prepared, each consisting of 0%, 15%, and 30% (by weight) BC as a replacement for cement, while GGBS remained constant to get the designed strength. Each mix was designed with two strength grades of 30 and 60 MPa by adjusting the compositional parameters and validating their 28 days compressive strength. Fresh Properties tests were conducted as per EFNARC standards. The ultrasonic pulse velocity of all tested specimens is greater than 4.5 km/s, indicating "good" and "excellent" quality concrete. The experimental results revealed that combining BC with GGBS concrete improved durability. The BC and GGBS made concrete more resistant to sulphate attack and chloride ingress. The concrete mixtures were found to be suitable and more durable for use in the construction industry.