Abstract
The usage of Supplementary Cementitious Materials (SCM) is very much acknowledged due to the several improvements possible in the concrete composites, and because of the general economy. Research work till date suggests that utilization of SCMs enhance a significant number of the performance characteristics of the hardened concrete. The idea of efficiency can be utilized for comparing the relative performance of different pozzolans when incorporated into concrete. The efficiency concept, which was initially developed for fly ash, can be effortlessly connected to other advantageous s as well, such as silica fume, slag and natural pozzolans. A quantitative understanding of the efficiency of SCMs as a mineral admixture in concrete is essential for its effective utilization. The paper reviews the literature pertaining to the different efficiency concepts and models present to date that evaluates the strength of concretes containing different SCMs. This short survey demonstrates that there is a need for a superior comprehension of the SCMs in concrete for its powerful usage. Also, it is an effort directed towards a specific understanding of the efficiency of SCMs in concrete.
Highlights
Concrete is a mix of ingredient of cement, fine aggregate, coarse aggregate & water
It assumes that a Portland cement/fly ash concrete will have the same strength as a Portland cement concrete of similar workability if w/(c + kFA) = w1/c1, where w, c, and Fly Ash (FA) are the weights of the free water, cement and FA respectively, and w1 and c1 are the weights of the free water and cement in the Portland cement concrete
Many of the results reported on the use of silica fume, pertain to discussions on various effects on compressive strength, either for the purpose of cement substitution or as a medium for strength increase but only a few of them contain adequate data to permit the estimation of efficiency factors
Summary
Concrete is a mix of ingredient of cement, fine aggregate, coarse aggregate & water. It can be moulded into any shape in the plastic stage. With the passage of time in the modern era investigation since last two to three decades, the Engineers & scientists are keen to improve the strength, durability & other characteristics of concrete keeping in view the structural stability of structure The demand for these characteristics derives the search for supplementary cementitious materials. SCMs contribute to the flow characteristics and cohesion required of Self-Compacting Concrete (SCC) [6,7,8] and in production of sustainable concrete [9,10,11]. Despite all that is accounted for to date, a technique for a correct assessment of the efficiency of SCMs in concrete for estimating compressive strength of the concrete with SCM is yet not presented.
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