Experimental comparative study on strength parameters of concrete assimilating glass fibers of fine aggregate, cement with rubber and GGBS

Abstract

The utilization of fibers and waste materials from industry in concrete is making a remarkable change in properties of concrete. For the present study a comparison of effectiveness in strength properties when rubber, GGBS and silica fumes are used as a substitute for fine aggregate and cement respectively and alkali-resistant glass fibers are added in concrete. The effect of addition or replacement of fibers and materials on strength parameters are studied. Fine aggregate is replaced with crumb rubber and cement is also replaced with GGBS in addition to Silica fumes, as required target strength is not attained when fine aggregate is replaced with rubber. A maximum of 30% of replacement of rubber is done, depending upon the results, it is known that replacement of rubber should be restricted and low w/c ratios should be adopted. Simultaneously, in another mix glass fibers are added to plain concrete in varying percentages, maximum of 1.5%. It is observed that the use of glass fibers in concrete mixes increases tensile strength without affecting its compressive strength, thus making it beneficial to use glass fibers as there is significant increase in strength. Depending upon the percentage of replacement and addition six trial, mixes are adopted. The strength comparison is done between the six trial mixes with nominal mix of grade M25 and are presented here.