Enhancement in high-strength Concrete Properties by Incorporating Ground Granulated Blas Furnace Slag and Rice Husk Ash

Abstract

Numerous advances in many areas of concrete technology including materials & mixture proportioning has been made. The high performance concrete (HPC) is gaining wider acceptability in routine practice. HPC provides enhanced strength and durability properties and contributes towards long lasting structures. The constructability can also be enhanced by proper mixture proportioning and testing. Most HPC mixtures include materials like Fly ash, Ground Granulated Blast Furnace Slag (GGBFS), Rice Husk Ash (RHA) etc. The replacement of Portland cement by GGBFS and RHA reduces the volumes of Portland cement used is a major benefit. The reduction of Portland cement introduction will reduce energy consumption and reduce the rate of global warming. Utilization of GGBFS and RHA usually provides cost savings as well as improved concrete properties. In this study. the dosages of GGBFS and RHA have been decided by an extensive literature survey. Total six mixes including control concrete, two GGBFS mixes with cement replacement by weight as 35% and 45%, and three RHA mixes with cement replacement by weight as 7.5%, 10% and 15% respectively are cast in the laboratory. Workability of all the mixes is measured by Slump and Compaction factor tests. Improvement in important mechanical properties i.e. Compressive strength, Split tensile strength and Flexural strength due to addition of GGBFS and RllA is also evaluated in case of all the mixes at 7, 28, 61 and 90 days respectively. The test result shows a substantial change in the 28-day compressive strength of concrete as compared to Control Mix, but not much difference was seen in the test results of tensile and flexural strength.