Laboratory Evaluation of Eco-Friendly Pervious Concrete Pavement Material Containing Silica Fume

Hanbing Liu,Wenjun Li,Yafeng Gong,Guobao Luo,Longhui Wang,Wensheng Wang

doi:10.3390/app9010073

Abstract

Pervious concretes, such as sustainable pavement materials, have great advantages in solving urban flooding, promoting urban ecological balance, and alleviating urban heat island effect, due to its special porous structure. However, pervious concrete typically has high porosity and low strength. The insufficient strength and poor freeze-thaw durability are important factors that restrict its wide application, especially in seasonal frozen areas. Improving the strength and freeze-thaw resistance of pervious concrete will expand its application. Silica fumes, as an industrial by-product waste and supplementary cementitious material, play an important role in improving concrete performance. The objective of this paper was to study the effects of silica fumes on properties of sustainable pervious concrete. Silica fumes were used to replace cement with the equivalent volume method at different levels (3%, 6%, 9%, and 12%). The control pervious concrete and silica fume-modified pervious concrete mixtures were prepared in the lab. The porosity, permeability, compressive strength, flexural strength, and freeze-thaw resistance properties of all mixtures were tested. The results indicated that the addition of silica fumes significantly improved the strength and freeze-thaw resistance of pervious concrete. The porosity and permeability of all pervious concrete mixtures changed little with the content of silica fumes due to the adoption of the equal volume replacement method.

Highlights

In recent years, urban floods have occurred frequently and caused huge casualties and property loss, due to the imperfect urban stormwater management system and large-area impervious pavement [1,2,3,4,5,6,7]
The results showed that the addition of silica fumes increased the compressive strength, but decreased the ductility of engineered cementitious composites
The results indicated that the compressive strength of pervious concrete was enhanced by the addition of silica fumes

Summary

Introduction

Urban floods have occurred frequently and caused huge casualties and property loss, due to the imperfect urban stormwater management system and large-area impervious pavement [1,2,3,4,5,6,7]. At the beginning of the 21st century, pervious concrete regained the attention of researchers and engineers due to the emergence of various urban problems, such as urban floods, urban heat island effects, groundwater decline, etc. Pervious concrete, as a porous material with high porosity, has great advantages [13,14,15,16]. It is an excellent and effective material in solving urban stormwater. It can allow stormwater permeating into underground, reduce surface water runoff, and improve the slip resistance of roads [13]. Its high porosity is able to accumulate more heat, regulate city temperature and humidity, and alleviate heat island

Objectives

Methods

Discussion

Conclusion