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Abstract

Sulphate permeability of concrete is the relative ease with which sulphate ion can penetrate into the pores of concrete. The study of sulphate permeability in concrete is of importance when concrete is subjected to sulphuric atmosphere such as saline nature, sulphuric manufacturing plants etc,. The penetration of sulphate ions into concrete may lead to the corrosion of reinforcement and hence weaken the structures and also adversely affect durability of concrete. Therefore a detailed study has been required to find the sulphate permeability of concrete. The aim of our study is to get acquainted with these Supplementary Cementatious Materials (SCM’s) and to examine some features. The most interesting feature is to increase chemical resistance of concrete. We will focus in our examinations on GGBS, Bethamcherla stone powder. In literature scientific experiments, they examine the influence of SCM’s on weight loss, strength characteristics and on the resistance to penetration of chemical also.

Supplementary cementatious materials can be used for improved concrete performance in its fresh and hardened state. They are primarily used for improved workability, durability and strength. These materials allow the concrete producer to design and modify the concrete mixture to suit the desired application. Concrete mixtures with high Portland cement contents are susceptible to cracking and increased heat

generation. These effects can be controlled to a certain degree by using supplementary cementatious materials. Supplementary cementatious materials such as red mud, bethamcherla stone powder, slag and silica fume enable the concrete industry to use hundreds of millions of tons of by product materials that would otherwise be land filled as waste. Furthermore, their use reduces the consumption of Portland cement per unit volume of concrete. Portland cement has a high energy consumption and emissions associated with its manufacture, which is conserved or reduced when the amount used in concrete is reduced