Issue 46

Y. Yanya, Frattura ed Integrità Strutturale, 46 (2018) 343-351; DOI: 10.3221/IGF-ESIS.46.31 343 Blending ratio of recycled aggregate on the performance of pervious concrete Yao Yanya Wuxi City College of Vocational Technology, Wuxi, 214063, China yaoyanya66@163.com A BSTRACT . Recycled pervious concrete as an environment-friendly and material-saving construction material can satisfy the current development demands of circular economy and environmental protection in China. But studies concerning the performance of recycled pervious concrete are not enough, which limits its application and promotion. In this study, waste prefabricated concrete beams were taken as the source of recycled aggregate and processed by crushing and screening to obtain recycled coarse aggregate. Then pervious concrete was prepared using the recycled coarse aggregate. Taking replacement rate and grain size grade as the running parameters, five groups of mix proportion were designed. Moreover the physical, mechanical and permeability performance and the interrelation were analyzed by tests. The results demonstrated that the 24-hour water absorption rate of the recycled coarse aggregate was 12 times higher than that of natural aggregate, the porosity of the pervious concrete was between 14.2% and 20.44%, and the permeability coefficient was between 0.19 cm and 0.46 cm and increased with the increase of the porosity. The compressive strength of the pervious concrete increased with the increase of the replacement rate. When the replacement rate was 30%, the improvement amplitude was the largest. The compressive strength was improved 35.4% after double grain grade aggregate was mixed, but the permeability performance decreased. K EYWORDS . Recycled aggregate; Pervious concrete; Permeability; Strength. Citation: Yanya, Y., Blending ratio of recycled aggregate on the performance of pervious concrete, Frattura ed Integrità Strutturale, 46 (2018) 343-351. Received: 10.06.2018 Accepted: 10.09.2018 Published: 12.09.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION emolition wastes has exceeded 1.5 billion tons in China every year with the acceleration of urbanization development, among which, 30%~50% is waste concrete; but the availability of the waste concrete is lower than 50% [1,2]. Therefore, recycling of waste concrete has arisen the attentions of the world. It is common to apply waste concrete in road embankment or as concrete aggregate after crashing, screening and cleaning, which can promote the sustainable development of the construction industry and has significant economic and social benefits [3,4]. Preparing D