Effect of GGBS on Self-compacting Recycled Aggregate Concrete

Self compacting concrete (SCC) is an extremely fluid mix which does not require tamping or vibration and gains its fluid property from high proportion of fine aggregate, super plasticizers and viscosity enhancing admixtures. One of the major draw back of SCC is its cost due to the utilization of high amounts of cement and chemical admixtures. Also large scale cement production causes the discharge of high amount of CO₂ into the atmosphere causing global warming and ozone layer depletion. So Ground Granulated Blast Furnace Slag (GGBS) can be used as a better substitute to cement which possessing cementitious property. Shortage of natural coarse aggregate in future can be solved by replacing it with recycled coarse aggregate from demolition waste itself. This study aim to determine the utilization of GGBS and recycled aggregate in SCC as an alternate material to cement and natural coarse aggregate by determining its workability and mechanical properties. Cement is replaced with GGBS at 20, 30, 40 and 50% by weight of cement in SCC and 40% of natural coarse aggregate is replaced with recycled aggregate (Vivek and Dhinakaran in Eng Sci Technol Int J 20:1173–1179, 2017 [2]). Optimum percentage of GGBS is evaluated by compressive, split tensile and flexural strength tests. From the experiment, the optimum percentage of GGBS obtained is 30%.