Effect of Dolomite and Metakaolin on the Properties of High-Performance Concrete

Abstract

Cement is one of the extensively used civil engineering material in the construction industry due to its strength characteristics. The use of cement-based materials and the development of infrastructure are rapidly increasing. The production of cement in large quantity leads to environmental degradation and emission of CO2. For making the construction process in more sustainable way, the pursuit for new binders has started and stimulated innovative opportunities to use industrial by product as binders. This paper studies the effect of dolomite and metakaolin on the properties of high-performance concrete. For the study, M70 grade of concrete taken and optimum percentage of metakaolin found out by replacing cement by metakaolin in varying percentages of 10%, 20% and 30%. Effect of metakaolin and dolomite in high performance concrete is found out by replacing cement by dolomite in varying percentages of 5%, 7.5%, 10% and 12.5% and obtained optimum percentage of metakaolin. Properties such as fresh, mechanical, and loading behavior of RCC beam were found out. To study the cost effectiveness of using metakaolin and dolomite in high performance concrete, cost analysis was carried out. The test results reveals that the compressive strength, flexural strength and split tensile strength for a curing period of 28 days shows an increase of 4.99%,15.78% and 5.89% respectively. Flexural behavior of RCC beam with optimum percentage shows an increase of 23.8 % compared to the control beam. Cost of saving of cement by using metakaolin and dolomite is about 10% and it can be used as an alternative of cement economically.