Effect of electric arc furnace steel slag on the mechanical and fracture properties of roller-compacted concrete

摘要

The present study made an effort to investigate effect of partial and full replacement of natural aggregate with the Electric Arc Furance (EAF) steel slag on the mechanical and fracture properties of Roller Compacted Concrete (RCC). Various concrete mixtures containing fine and coarse EAF steel slag were prepared to find out the impact of each part on the performance of RCC mortar and concrete mixture. To investigate mechanical properties of the mixtures specimens of RCC, different tests were performed, including the splitting tensile, compressive, semi-circular bending and three-point bending tests. The Results showed that fine and coarse EAF steel slag had different impacts on the mechanical properties of the RCC. The results showed that for fine aggregate replacement, obtained mechanical responses decreased by increase in the amount of EAF steel slag, which have the high specific surface area. Besides, incorporating the coarse EAF steel slag increased aggregate interlock mostly due to its high angularity and roughness causing to promote the mechanical and fracture properties. The investigated broken aggregate fraction on the fracture face of beams by image processing and pull-off test results confirmed the mentioned findings. (C) 2019 Elsevier Ltd. All rights reserved.