A study on the Water Proofing Behaviour of Fly Ash, M-sand and Dust based concrete with varying percentages of different Crystalline Admixtures

Abstract

For many years, concrete has been the most commonly used building material. When we focus on sustainable materials, long-term serviceability becomes an issue. There are methods for lowering risks and increasing service life. Crystalline admixtures, also known as permeability-dropping, are marketable products used in little concentrations in cement incorporated materials to enhance concrete durability and promote autogenous crack healing. This paper presents various investigations into the mechanical and long-term durability characteristics of concrete made with Fly ash, M-sand, Dust. In this study, fly ash is used as a 30% substitute for cement, M-sand and Dust is used as a 100% substitute for river sand and two types of crystalline admixtures with different proportions of 0%, 0.5%, 1.0%, and 1.5% were added to the mix. Cubes and Cylinders were casted by mixing M-Crete and Master Pel 760 crystalline admixtures for two grades, M25 & M35 and left for curing period of 28 days. Test methods include compressive strength, split-tensile strength, RCPT, % of water absorption and % of Voids. The test results showed that both crystalline admixtures with Fly ash at 0.5% produced better results and significant rise in compressive strength and tensile strength. Similarly, a decrease in percentages of RCPT, water absorption, voids was observed in both M25 and M35 grades. Finally, Master Pel 760 has shown better performance than M-Crete crystalline admixture. So, the above two crystalline admixtures have the potential to increase the durability and decrease the permeability of concrete.