Reaction mechanism of multi blend cementitious systems - A review

摘要

Various kinds of industrial wastes, mine rejects and by products such as fly ash from thermal power plants, granulated blast furnace slag and other slags from steel plants, low grade limestone from mineral processing industries and cement plants, lead-zinc slag from zinc smelters, copper slag from copper smelters, equilibrium catalyst from refineries, jerossite and kimberlite from mineral processing industries and so on are generated from industries. Considerable research have been carried out for utilization of such wastes in cement manufacture both singularly and in combination as blending materials (BM), in cement manufacture. It has been established that the reaction mechanism of binary system of clinker with single BM is quite different than that of ternary system, quaternary system and so on and so is the effect on strength and durability of resultant concretes. The reaction mechanisms largely depended upon the source of generation, quantity, quality and quality variations of these BM's, quality of clinker used and the grinding systems employed. As part of the research process, in the first instance, an attempt has been made to explore the various reported mechanism of addition of these blending materials in cement manufacture and to analyses such mechanism in order to explore the possibilities and extent of addition of more and more BM's. Since these BM's are added after the clinkering stage, they substantially reduce heat consumption and mitigate CO_2 emission levels to the extent of the addition levels used. Later on, the effect addition of BM'S on strength and durability of resultant concretes shall be reported as the experiments are going on.