Effect of Fly Ash & Ground Granulated Blast Furnace Slag as Cement Replacement Materials on Strength and Durability Characteristics of Pavement Quality Concrete (PQC)

Abstract

The major problem the world is facing today is the environmental pollution. The best way to dispose any waste material is to use it as one or the other forms like construction material. The Ordinary Portland Cement (OPC) is one of the main ingredients used for the production of concrete. Unfortunately, production of cement causes emission of large amount of carbon-dioxide gas into the atmosphere, a major contributor for greenhouse effect and the global warming. Also, Portland cement being very expensive material affects the total cost of construction of any project. Hence, the researchers are currently focused on use of waste material having cementing properties, which can be added in cement concrete as partial replacement of cement, without affecting its strength and durability, which will result in decrease of cement production thus reduction in emission of greenhouse gases, global warming and the cost of construction. The ground granulated blast furnace slag and fly ash are the waste products from the iron manufacturing and thermal plant industry respectively, which may be used as partial replacement of cement in concrete due to its inherent cementing properties. The present study aims at, developing pavement quality concrete mixtures incorporating ground granulated blast furnace slag and fly ash as partial replacement of cement. In this study, the flexural, compressive and rapid chloride permeability test for pavement quality concrete mixtures for different percentage of GGBS and fly ash as replacement of cement are reported. It is found out the maximum increase in flexure strength is for 20% fly ash and 60% GGBS. The increase in compressive strength is maximum for 10% fly ash and 50% GGBS. From durability point of view, we can use all the mixes as their permeability is very low.