Experimental investigation on mechanical properties of sustainable roller compacted concrete pavement (RCCP) containing waste rubbers as alternative aggregates

Assessment of Special Rubberized Concrete Types Utilizing Portable Non-Destructive Tests

“…The bestoptimized strength achieved in the NC rubberized concrete was at 25% coarse aggregate replacement [24][25][26][27][28][29], while for SCC 10 percent of total aggregate volume showed the best performance . Finally, the RCC rubberized concrete showed optimized compressive strength at 10% fine aggregate replacement by crumb rubber [65,74].…”

“…As the crumb rubber size decreased, the surface area that covered the crumb rubber by cement area increased, and thus, the weakening of ITZ was higher and more pronounced. This is because the optimum amount of replacement in the case of SCC is 10% for fine aggregate, not higher than 10% (see Figures 11,21,and 14 in [55,65,67]). On the contrary, the RCC showed scatter behavior when fine aggregate was replaced by crumb rubber [65][66][67][68][69][70][71][72][73][74].…”

“…For the trending concrete types such as SCC and RCC, the crumb rubber has revealed different guides on whether to replace coarse or fine aggregate for better strength performance of the concrete. Table 1 and Table 2 [65][66][67][68][69][70][71][72][73][74] were generated by summing up collected data from the existing literature review showing the replacement of fine, coarse, and combined aggregate with crumb rubber in SCC [39] and RCC. Most researchers agree that replacing the rubber with fine aggregate in the case of SCC would be more beneficial than the coarse or total aggregate.…”

“…Other researchers [54,60,61] concluded that the total aggregate replacement with crumb rubber would perform better by lowering the strength reduction that occurs when adding crumb rubber to the concrete mix, as in the case of fine or coarse aggregate replacement. Similarly, in RCC, most of the researchers [65][66][67][68][69][70][71][72][73][74] studied the replacement of fine aggregate or combined (total aggregate). Most investigations have explored the utilization of crumb rubber as fine aggregate replacement.…”

“…Most investigations have explored the utilization of crumb rubber as fine aggregate replacement. Nevertheless, Keles et al [65] studied the utilization of total aggregate replacement by crumb rubber. They revealed that the total aggregate replacement would not provide adequate enhancement in strength reduction if the crumb rubber was utilized in mixes.…”