Waste-Based Pervious Concrete for Climate-Resilient Pavements.

Hsin-Lung Ho,Hui-Mi Hsu,Lih-Chuan Hwang,Wei-Ting Lin,Ran Huang

doi:10.3390/ma11060900

Hsin-Lung Ho, Hui-Mi Hsu + Show 3 more

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https://doi.org/10.3390/ma11060900

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Abstract

For the sake of environmental protection and circular economy, cement reduction and cement substitutes have become popular research topics, and the application of green materials has become an important issue in the development of building materials. This study developed green pervious concrete using water-quenched blast-furnace slag (BFS) and co-fired fly ash (CFFA) to replace cement. The objectives of this study were to gauge the feasibility of using a non-cement binder in pervious concrete and identify the optimal binder mix design in terms of compressive strength, permeability, and durability. For filled percentage of voids by cement paste (FPVs) of 70%, 80%, and 90%, which mixed with CFFA and BFS as the binder (40 + 60%, 50 + 50%, and 60 + 40%) to create pervious concrete with no cement. The results indicate that the complete (100%) replacement of cement with CFFA and BFS with no alkaline activator could induce hydration, setting, and hardening. After a curing period of 28 days, the compressive strength with different FPVs could reach approximately 90% that of the control cement specimens. The cementless pervious concrete specimens with BFS:CFFA = 7:3 and FPV = 90% presented better engineering properties and permeability.

Highlights

Rapid progress in industry and commerce in recent years has brought with it fast and significant growth in inter-city and intra-city transportation
The experiment groups show that as the proportion of co-fired fly ash (CFFA) declined from 50% to
From the previous study [11,12], we can see that the CFFA and blast-furnace slag (BFS) in the experiment groups contain compounds such as Ca(OH)2, CaO, CaSO4, and SiO2, among which CaO and CaSO4 engage in hydration reactions with water: CaSO4 + 2H2 O → CaSO4 ·2H2 O, (3)

Summary

Introduction

Rapid progress in industry and commerce in recent years has brought with it fast and significant growth in inter-city and intra-city transportation. During the process of urbanization, impermeable surfaces such as roads and sidewalks have expanded and taken up a considerable proportion of land area, thereby causing major changes in the regional water cycle. It is difficult to expand the underground drainage systems in cities. Recent years have seen a rising awareness of water permeability and water retention in cities. Increasing water permeability entails increasing the permeability of urban surfaces [4,5]. If rainwater can reach the earth beneath, the pores in the soil can hold the water, thereby achieving water retention. Adding infiltration systems to urban environments and applying permeable concrete surfaces can reduce the burden on drainage systems when the rainfall exceeds engineering design standards.

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