COMPATIBILITY AND EFFICIENCY OF NEW GENERATION SUPERPLASTICIZERS FOR DIFFERENT BRANDS OF CEMENT

Abstract

In order to meet the performance requirements of the concrete for various infrastructure projects, concrete mixers have to be designed and produced using combinations of different cementitious materials with water and aggregate and chemical admixtures. The active constituent of concrete is cement paste and largely it determines the performance of the cement paste, also setting time acceleration or retardation can be achieved by the use of admixtures. In addition of some particular admixture may develop undesirable interaction between varying ingredients of concrete. Many times, addition of admixture beyond the certain limit may show incompatibility. Multiple brands of cement and admixtures are available in the market, these performance are not same in the
concrete for each and every brands of cement and admixtures even if quality and source of other ingredients of concrete if kept same, this has create a lot of confusion among the user about what types or brands of admixtures is used with what type or brand of cement and what should be the optimum dose of admixture. Common problem associated with incompatibility issue in flash setting, delayed setting, rapid slump loss, improper strength gain and cracking, These not only effect the strength of the concrete but also the durability of the structure, hence in this project we studied two different brands of cement (Birla super cement and Maha cement) with two types of admixture (Master Glenium sky 8221 and Master Rheobuild 1126 ND) available in the market is used to find the optimum
dosage and efficiency of admixtures, to achieve this marsh cone test has been conducted.