Mechanical Properties, Permeability, and Freeze–Thaw Resistance of Pervious Concrete Modified by Waste Crumb Rubbers

Hanbing Liu,Haibin Wei,Yafeng Gong,Guobao Luo

doi:10.3390/app8101843

Abstract

Due to the negative effects that derive from large impervious surfaces in urban areas, pervious concrete has been developed, and has become an environmentally friendly pavement material. As a porous and permeable material, pervious concrete presents an overwhelming advantage in solving urban problems, such as flooding, groundwater decline, urban heat island phenomena, etc. Waste crumb rubber has been verified as a feasible modifier for pavement material. The objective of this paper is to explore the effects of rubber particle size and incorporation level on the permeability, mechanical properties, and freeze–thaw resistance of pervious concrete. Two kinds of rubbers (fine and coarse) with four incorporation levels (2%, 4%, 6%, and 8%) are used in the experiment. Permeability, compressive strength, flexural strength, flexural strain, and freeze–thaw resistance are tested. The results indicate that the addition of rubber slightly decreases strength and permeability, but significantly enhances ductility and freeze-thaw resistance. Fine crumb rubber with a suitable incorporation level could remarkably improve the ductility and freeze–thaw resistance of pervious concrete without sacrificing excessively strength and permeability.

Highlights

Global urbanization is the inevitable outcome of rapid social and economic development.The speed of urbanization has reached an unprecedented level over the past few decades
Permeability, abrasion resistance, and compressive strength were measured, and the results showed that the addition of rubber enhanced the abrasion resistance, but decreased compressive strength and permeability compared to the unmodified control mixtures
Based on our previous study and existing research by other scholars, this paper investigates the effect of rubber particle size and dosage (2%, 4%, 6%, and 8%) on the properties of pervious concrete

Summary

Introduction

Global urbanization is the inevitable outcome of rapid social and economic development.The speed of urbanization has reached an unprecedented level over the past few decades. It is extremely urgent to seek new solutions for the mitigation of flooding impacts and urban water management [4,5,6,7]. Due to its unique structure, pervious concrete has had many other advantages with regard to alleviating the urban heat island effect, reducing noise pollution, improving water quality, and maintaining the urban ecological balance [10,11,12]. These advantages have made pervious concrete an environmentally friendly and sustainable material in paving applications

Objectives

Methods

Results

Conclusion