Experimental Study of Strength and Corrosion Resistive Property of Fly Ash Concrete with Inhibitors

Abstract

The present study describes the behavior of concrete as well as fly ash concrete when subjected to varying number of high temperature heating cycles. A Concrete mix (1:1.5:3) with 320 kg/m3 cement and w/cm ratio 0.55 was prepared. Cement was replaced by varying percentages (10%, 20%, 40%, 50% and 60%) of fly ash by weight of cement. The concrete was subjected to a constant temperature of 200°C for 7, 14, 21 and 28 heating cycles. One heating cycle corresponds to 8 h heating and subsequent cooling in 24 h. From the literatures it is to be noted that fly ash can be used as partial replacement of cement and in production of lightweight aggregate. Concrete grade considered for experimental study is M20 with 43 grades OPC. Binding material used for concrete is cement with percentage replacement of fly ash as 10% to 50%. 20mm angular granite broken stones conforming to single size aggregate as IS 383-1970 is used as coarse aggregate. The annual consumption of concrete is about fifteen billion tone annually. At the same time abundant quality of fly ash from thermal power plants are being thrown out as waste which creates severe ecological problems and requires larger storage area. The experiment will comprise of strength and durability study on concrete with high volume fly ash. Half-cell potential measurements are simple, inexpensive and virtually non-destructive techniques to assess the corrosion risk of steels in concrete. However, the negative potential area on the equipotential contour map corresponds to high chloride content and localized corrosion. The measured values of the half-cell potential fluctuate due to several factors: the temperature, the type of reference electrode, and the pre-wetting time.