INNOVATIVE CONSTRUCTION MATERIALS & EFFECT OF ADMIXTURES ON THEIR PROPERTIES

Abstract

The main aim of this project is to check the effects of adding Rice Husk Ash (RHA) in the Ordinary Portland Cement, and to check what is the optimum amount of RHA that can be used in cement mortar without any kind of compromise in the strength of mortar. So this project is a study of performance of cement mortar by biased replacement of cement with the Rice Husk Ash. The maximum amount of replacement of Rice Husk Ash in cement is also calculated in this project. Effects of RHA on setting time of mortar is also computed Extensive hard work are being taken globally to utilize natural waste and by product as supplementary cementing materials to improve the properties of cement concrete. Rice husk ash (RHA) and Fly ash (FA) with using Steel slag is such Innovative Construction Materials. The detailed experimental investigation is doing to study the effect of partial replacement of cement by FA, RHA with using Steel slag in concrete. In this research work started proportion form 22% FA and 8% RHA mix together in concrete by replacement of cement last proportion taken 19% FA and 11% RHA, with gradual increase of RHA and simultaneously gradual decrease of FA and to improve the strength of concrete steel slag was added. The purpose of this research is to study the effects of mineral admixture on the mechanical properties compressive strength(7days,14 days,28 days ,90 days) flexural tensile strength, splitting tensile strengths at age of 7 days, 28 days and also comparative study of properties of uncontrolled RHA and controlled RHA in cement mortar. In this research presents a review of the properties of cement concrete including workability, setting time by using mineral admixtures fly ash (FA), steel slag (SS) and rice husk ash (RHA). Comparison of normal and high-strength concrete in which cement has been partially supplemented by mineral admixture has been considered. It has been concluded that mineral admixtures may be categorized into two groups: chemically active mineral admixtures and micro filler mineral admixtures. Chemically active mineral admixtures decrease workability and setting time of concrete but increase the heat of hydration and reactivity. On the other hand, micro filler mineral admixtures increase workability and setting time of concrete but decrease the heat of hydration and reactivity. In general, small particle size and higher specific surface area of mineral admixture are favorable to produce highly dense and impermeable concrete; however, they cause low workability and demand more water which may be offset by adding effective super plasticizer.