Significance of Silica Fume and Glass Fiber on the Mechanical Properties of Recycled Aggregate Concrete

Construction and infrastructure are the fastest growing industries and concrete is the second highest used resource in todays scenario after water which leads to huge quantities of C& D waste (construction and demolition). This creates a significant problem because of the difficulties associated with managing the increased volume of concrete waste. The various studies related to sustainable concrete construction have encouraged recycled aggregate which is a Replacement of natural aggregate in concrete mixes. As a result, use of recycled aggregate it can reduce the amount of landfill as well as requirement of virgin aggregate. In this experimental study the natural coarse aggregate is replaced with 0 %, 25 %, 50 %, 75 %, and 100 %, with recycled coarse aggregate. The strength of concrete decrease with increase in the percentage of recycle aggregate, this is due to improper bonding between the cement paste and aggregate. The significance of silica fume in concrete mix will improve the bonding and quality of recycled aggregates in concrete. The percentage of partial replacement will be 0 %, 10 %, 15 %, with silica fume. And also to increase the tensile strength of concrete we use glass fibers with different percentages 0.005 %, 0.015 % and 0.025 %. Concrete specimen will be casted with Triple mixing method (TM). In this experiment concrete made with silica fume with partial replacement of cement, Glass Fibers are added to the cement and recycled coarse aggregate as Replacement of natural coarse aggregate will be studied to improve the workability, compressive strength, and tensile strength. In this study, the mixing of concrete is done by triple mix method. With silica fume as an admixture recycled aggregate concrete of M35 grade will be manufactured and tested for physical and mechanical properties. These strength results obtained is compared with conventional concrete results. The target strength is achieved in compression at 12.5 % replacement of silica fume, 0.005 % addition of S-Glass fibers and also in tension at 12.5 % replacement of silica fume, 0.015 % addition of S-Glass fibers.