Abstract
Pervious concretes, as sustainable pavement materials, have great advantages in addressing a number of environmental issues. Fly ash, as the industrial by-product waste, is the most commonly used as cement substitute in concrete. The objective of this paper is to study the effects of waste fly ash on properties of pervious concrete. Fly ash was used to replace cement with equivalent volume method at different levels (3%, 6%, 9%, and 12%). The control pervious concrete and fly ash modified pervious concrete were prepared in the laboratory. The porosity, permeability, compressive strength, flexural strength, and freeze–thaw resistance of all mixtures were tested. The results indicated that the addition of fly ash decreased the early-age (28 d) compressive strength and flexural strength, but the long-term (150 d) compressive strength and flexural strength of fly ash modified pervious concrete were higher than that of the early-age. The adverse effect of fly ash on freeze–thaw resistance of pervious concrete was observed when the fly ash was added. The porosity and permeability of all pervious concrete mixtures changed little with the content of fly ash due to the use of equal volume replacement method. Although fly ash is not positive to the properties of pervious concrete, it is still feasible to apply fly ash as a substitute for cement in pervious concrete.
Highlights
Pervious pavement plays an important role in urban rainwater management system
The pervious pavement is the connecting passage between the underground and the ground, so that the ground is warm in winter and cool in summer, which can increase the comfort of urban living [11]
The results showed that the addition of fly ash reduced the compressive strength about 40%, but it is positive in improving the ductility of engineered cementitious composites (ECC)
Summary
Pervious pavement plays an important role in urban rainwater management system. At the same time, it is of great significance to the future development of the urbanization [1]. Large area of the city's original soil surface has been coated with cement, concrete, and other impervious surfaces [2]. The public places such as sidewalks, open-air parking lots and square, were covered by stone or cement brick. Impervious surface has a significant adverse impact on urban ecology and climate environment while improving traffic and road conditions and beautifying the environment [3,4,5]. The pervious pavement is the connecting passage between the underground and the ground, so that the ground is warm in winter and cool in summer, which can increase the comfort of urban living [11]. Due to the large number of pores and large specific surface area of pervious pavement, it has strong adsorption capacity for dust, which can reduce dust pollution
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
