Experimental Study on Performance Optimization of Pervious Recycled Concrete Based on Orthogonal Test

Abstract

Abstract: Pervious concrete has wide application prospects in alleviating urban waterlogging, noise effect and heat island effect, but its low strength due to porosity limits its further application. The recycled coarse aggregate and polypropylene fiber were used to formulate high performance pervious concrete. A five-factor, four-level orthogonal test was designed to analyse the effects of water-binder ratio, target porosity, recycled coarse aggregate replacement rate, fly ash content and polypropylene fiber content on the performances of pervious recycled concrete in terms of compressive strength, effective porosity and permeability coefficient using the extreme difference method. The results show that the main factors affecting the compressive strength of pervious recycled concrete are: target porosity>recycled coarse aggregate replacement rate>water-binder ratio>polypropylene fiber content>fly ash content. The maximum compressive strength of pervious recycled concrete is 48.26 MPa and the permeability coefficient is 1.96 mm/s. The compressive strength decreases linearly with the increase of target porosity. The compressive strength of pervious recycled concrete increases by 119.08% to 28.7 MPa and the permeability coefficient increases by 9.44% when 40% of recycled coarse aggregate replaces the natural coarse aggregate by the same amount. The addition of 0.11% by volume of polypropylene fiber increases the compressive strength of pervious recycled concrete by 10.48% to 27.4 MPa, and does not reduce the permeability performance. The results of this study can provide a basis for the preparation of high performance pervious recycled concrete.

Key words: pervious concrete, recycled coarse aggregate, polypropylene fiber, orthogonal test, compressive strength, permeability coefficient

CLC Number:

TU528

XIA Dongtao, LI Xiangyang, HU Jun'an. Experimental Study on Performance Optimization of Pervious Recycled Concrete Based on Orthogonal Test[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2748-2758.

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