Abstract
Pervious concrete is recommended, which is of great benefit to the ecological environment and human living environment. In this paper, the influences of five water-cement ratios and four fly ash contents to replace the cement by mass with a water-cement ratio of 0.30 on the properties of Recycled Aggregate Pervious Concrete (RAPC) were studied. Following this, based on the Grey relational-Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) optimization method, the strength, permeability, abrasion loss rate, and material costs of RAPC were adopted as evaluation indices to establish a mix proportion optimization model. The results show that the increase of water-cement ratio and fly ash replacement level of RAPC leads to decreased compressive strength while an increase in the permeability and abrasion loss rate. According to test results based on the optimal model 0.30 was identified as the best mix proportion. In addition, ecological-economic analysis of RAPC raw materials was carried out by comparing different natural aggregates. The results of EE (embodied energy) and ECO2e (embodied CO2 emission) pointed out that the combination of recycled aggregate and fly ash leads to significant ecological and economic benefits.
Highlights
With the rapid development of the world economy, the process of global urbanization is accelerating.the disadvantages are magnified gradually, and construction waste is seen as one of its products
Combining recycled aggregate and pervious concrete to produce Recycled Aggregate Pervious Concrete (RAPC) inherits the advantages of pervious concrete and promotes green and sustainable development; RAPC has been widely applied to parks, parking lots, sidewalks and other areas
The current research results of RAPC mix ratios are not quite consistent, so studying on mix design for recycled aggregate pervious concrete considering various water-cement ratios and fly ash contents is essential, which will provide reliable information to promote the application of RAPC
Summary
With the rapid development of the world economy, the process of global urbanization is accelerating. Güneyisi et al [12] studied the application of recycled aggregate instead of natural aggregate in pervious concrete based on 0.27 and 0.32 water-cement ratios This will lead some staff or researchers to get into trouble when selecting a reference, which is extremely unfavorable to a wider application of RAPC. The current research results of RAPC mix ratios are not quite consistent, so studying on mix design for recycled aggregate pervious concrete considering various water-cement ratios and fly ash contents is essential, which will provide reliable information to promote the application of RAPC. The optimal mix proportion of RAPC water-cement ratio and fly ash instead of cement were determined, respectively, through constructing the optimization model based on Grey relational analysis-TOPSIS method, and the ecological-economic benefits were analyzed.
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