Mix design recycled aggregate pervious concrete and the influence on pavement property

Abstract

This paper prepared recycled aggregate pervious concrete by replacing natural aggregate with 100% volume of waste concrete. We carried out experiments to study the influences of strength grade and target porosity of waste recycled aggregate concrete on the recycled one's compressive strength and permeability coefficient. Then, the optimal proportion meeting the requirements of pervious concrete pavement is obtained, which is expected to be applied to the pavement with low strength requirement and water permeability. The test results of the compressive strength and permeability coefficient of 28-day test cubes show that, considering both the compressive strength and permeability, the best proportion is as follows: The strength grade of recycled aggregate is C20 + C30, the mix proportion of aggregate is 50%, the target porosity is 15%, the water-cement ratio is 0.3, the recycled aggregate is composed of 50% recycled aggregate with a particle size of 4.75-9.5 mm and 50% that of 9.5-19 mm, and the optimal mix proportion of recycled aggregate pervious concrete (kg/m3) is: M (recycled aggregate): M (cement): M (water) = 1357.04:564.94:169.88. The compressive strength and the permeability coefficient of recycled aggregate pervious concrete based on this mix proportion are 25.07 Mpa and 6.23 mm/s, respectively, which are in line with the provisions of Technical Specification for Application of Recycled Aggregate Pervious Concrete (CJJ/T 253-2016) and can be used for pavement. The study results can provide a reference for the promotion and application of recycled aggregate pervious concrete in the pavement.