Abstract
This investigational study aims to examine the influence of using recycled coarse aggregate (RCA) instead of natural coarse aggregate (NCA) on the fresh properties (workability) and mechanical properties of pervious concrete (PC). The mechanical properties include compressive strength, splitting tensile strength and flexural strength and the impact resistance of PC was also assessed using drop weight test. In total, four mixes were prepared (including control mix with 100% NCA) in which various ratios of RCA (30%, 70% and 100%) replaced the NCA in the preparation of PC mixes without using any fine aggregate and fixing the water-cement ratio (w/c) to 0.4. The outcomes of the study reveal that the content of the RCA has significant adverse effects on the workability and mechanical performance of the investigated mixtures. This adverse effects increase with the increase of the content of RCA. The strength reduction, compared to the mix with NCA, reached to 59% for compressive, 28% of the splitting tensile, 38% for flexural strength and 50% for the impact resistance when 100% RCA is used.
Highlights
The amassing of massive quantities of waste materials in particular waste of construction and demolition activities, especially in urban areas, is one of the world's largest sustainability issues and environmental concerns
recycled coarse aggregate (RCA) decreased by 27%, 65% and 81%, respectively, for the mixes M2, M3 and M4 compared to the reference M1
The general trend of Replacing natural coarse aggregate (NCA) by RCA in the pervious concrete the impact load resistance of the mixes with recycled mixes caused a significant drop in the splitting tensile aggregate shows a substantial decrease reaches more than strength of concrete by about 23%, 24% and 28%, 50% when 100% of NCA substituted with RCA as respectively, for the mixes M2, M3 and M4 compared illustrated in Figure 12 (A)
Summary
The amassing of massive quantities of waste materials in particular waste of construction and demolition activities, especially in urban areas, is one of the world's largest sustainability issues and environmental concerns If such a large amount of waste is disposed of, the planet will face major environmental issues, such as the depletion of landfill space. Rainwater that previously evaporated or drained into the groundwater is either flowing into the stream through the drainage system or accumulating on the road's surface. City flooding is increasing, groundwater levels are dropping due to reduced rainwater surface penetration, and environmental issues such as the heat island phenomenon in urban areas are emerging [4]
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