Investigating Composite Cement Concrete Utilizing Recycled Aggregate And Stone Dust

Abstract

Evolution of technology in our society is still highly pervasive in nature and the upcoming process of globalization significantly affects the state of the environment. Along with the increase in population, unbounded pumping of raw materials for production of materials and urbanization of the environment, there is wide range of increase in harmful emissions and waste generation. Mineral resources are limited significantly. Resources to feed our growing population are limited as well as the materials required to construct buildings and infrastructure. The use of auxiliary cementitious materials such as fly ash (FA) and ground granulated blast furnace slag (GGBS). Recent studies show a steady increase in use of fly ash and blast furnace slag in construction industry as an economical and effective solution for partial replacement of cement. An arduous issue when replacing cement is that the auxiliary materials affect concrete properties variously according to several factors such as the grade of cement, percentage of replacement, curing periods and environment condition. In order to determine how the concrete strength and its rheological properties can be affected by auxiliary material, this study investigates the strength properties of M25 grade of composite cement concrete in which coarse aggregate is replaced with 30% of recycled aggregate and fine aggregate is replaced with 20% & 30% of stone dust. The outcomes indicated that the addition of recycled aggregate and stone dust in composite cement concrete enhances not only the mechanical strength but also workability which eventually improves the properties of concrete.