Experimental study of the Effect of Steel Slag and Reclaimed Asphalt Pavement (RAP) on the Properties of Self-compacting Concrete (SCC) Pavement

The existence of waste materials from various physical and chemical processes is one of the important problems of industrialized and developing countries. For this reason, extensive research is being done on the methods of recycling or disposing of them in order to minimize the damage to the environment. In the present study, the effect of using recycled asphalt crumb (RAP) as a substitute for natural aggregate and steel slag as a substitute for cement in self-compacting concrete (SCC) mixtures for the construction of road pavements has been investigated. For this purpose, fresh concrete tests including slump flow, V funnel, L box, J ring and hardened concrete tests of compressive, tensile and bending strength were performed on the samples. The results showed the effect of using slag instead of cement and asphalt chips. Instead of coarse grain, it reduces the compressive, tensile and bending resistance of self-dense concrete. Also, by replacing up to 25% of stone materials with small asphalt materials and 30% of slag with cement, minimum acceptable standards were achieved according to the relevant standards. Also, for the design of double mixes, the design containing 30% asphalt crumb instead of stone materials with 25% slag instead of cement has shown more suitable results. The most optimal mode of using these materials is respectively using 30% slag instead of cement and 25% asphalt crumb instead of stone materials.