Abstract
Pervious concrete (PC), as an environmental friendly material, can be very important in solving urban problems and mitigating the impact of climate change; i.e., flooding, urban heat island phenomena, and groundwater decline. The objective of this research is to evaluate the strength, permeability, and freeze-thaw durability of PC with different aggregate sizes, porosities, and water-binder ratios. The orthogonal experiment method is employed in the study and nine experiments are conducted. The compressive strength, flexural strength, permeability coefficient, porosity, density, and freeze-thaw durability of PC mixtures are tested. Range analysis and variance analysis are carried out to analyze the collected data and estimate the influence of aggregate size, porosity, and water-binder ratio on PC properties. The results indicate that porosity is the most important factor determining the properties of PC. High porosity results in better permeability, but negatively affects the mechanical strength and freeze-thaw durability. PC of 15% porosity can obtain high compressive strength in excess of 20 MPa and favorable freeze-thaw durability of 80 cycles without sacrificing excessive permeability. Aggregate size also has a significant effect on freeze-thaw durability and mechanical strength. Small aggregate size is advantageous for PC properties. PC with 4.75–9.5 mm coarse aggregate presents excellent freeze-thaw durability. The influence of the water-binder ratio on PC properties is not as significant as that of aggregate size and porosity. An optimal mix ratio is required to trade-off between permeability, mechanical strength, and freeze-thaw durability.
Highlights
With rapid economic development, global urbanization has reached an unprecedented level.High urbanization generates excessive resource consumption and increased carbon emissions, which results in great changes in the global climate [1]
Cities are increasingly feeling the effects of extreme weather and many urban problems are caused by climate change, such as flooding and urban heat island phenomena [2]
All parameters of pervious concrete (PC) were tested with three specimens in each group
Summary
High urbanization generates excessive resource consumption and increased carbon emissions, which results in great changes in the global climate [1]. It is extremely urgent to seek solutions for the mitigation of climate change impact and urban water management [3]. Called porous concrete, has been used since the 1970s in the United States and Japan. It is a kind of porous lightweight concrete made of aggregate, cement, and water. It has a honeycomb structure with uniformly distributed pores formed by coarse aggregate and a thin layer of cement paste [4,5].
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