Abstract
Construction and demolition wastes (C&DWs) have raised a large number of ecological and environmental problems. Recycling C&DWs into arecycled concrete aggregate (RCA) will help save natural resources effectively and reduce the negative impact of C&DW on the environment. Innovative pervious concrete (IPC) can mitigate extreme weather disasters, such as rainstorms, and overcome the low strength and poor durability of traditional pervious concrete. In this study, innovative recycled pervious concrete (IRPC) is prepared by combining RCA with IPC, which has broad application prospects and ecological friendliness. This study investigates the effect of RCA quality grades and replacement rates on the mechanical property, permeability, sulfate resistance and abrasion resistance of IRPC. IRPC mixtures were prepared with three different quality grades (high, medium and low qualities) of aggregates named as NA, RCA1 and RCA2. Moreover, the replacement rate of RCA for NA varied as 0%, 25%, 50%, 75% and 100%. The IRPC specimens were tested for compressive strength, mass loss and abrasion resistance after different sulfate wetting-drying cycles of 0, 30 and 60. The results exhibited that the initial compressive strength of all types of IRPC was more than 40 MPa. The compressive strength and mass of most IRPC increased first and then decreased slightly with the passage of a number of sulfate wetting-drying cycles, indicating IRPC has good resistance to sulfate attack. Sulfate attack and the addition of RCA will reduce the abrasion resistance of IRPC. However, when the replacement rate is lower than 50%, and the RCA quality is better (attached mortar content < 25%), the abrasion resistance of IRPC will be improved under sulfate attack. The experimental results might be useful as a reference and design methodology for employing IRPC in pavement applications in the future.
Highlights
With the acceleration of urbanization, the whole world is facing with shortage of natural aggregate (NA) and increasing and haphazard piles of construction and demolition wastes (C&DWs) [1,2]
The volume of sulfate erosion products expanded further, and cracks occurred in the innovative recycled pervious concrete (IRPC) matrix, especially in interfacial transition zone (ITZ), resulting in the decline of strength
The change of compressive strength under sulfate attack can be divided into a strengthening stage and a degradation stage
Summary
With the acceleration of urbanization, the whole world is facing with shortage of natural aggregate (NA) and increasing and haphazard piles of construction and demolition wastes (C&DWs) [1,2]. In order to deal with the continuous destruction and pollution to the environment caused by the above problems, one of the possible solutions is to recycle C&DWs into a recycled concrete aggregate (RCA) [3,4]. The results prove that innovative pervious concrete is superior to traditional pervious concrete in mechanical properties and frost resistance. The environmental friendliness of innovative pervious concrete can be further improved by replacing NA with RCA. Whether it has adverse effects on mechanical properties and durability of innovative recycled pervious concrete (IRPC) remains to be studied
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