The Bearing and Breakage Characteristics of Crushed Stone Aggregates in the Bedding Course of Permeable Roads

Zhongbing Cai,Chengchun Qiu,Hualei Zhang

doi:10.1155/2020/8890672

Abstract

The current study of permeable roads helps address urban flooding in Chinese cities caused by frequent heavy rainfall and build smart cities with sponge-like functionality. Crushed stone is widely used in constructing the bedding course of permeable roads because it has good water permeability. Experiments on the compaction of crushed stone were carried out by considering the impact of particle size and gradation to examine the strength and particle breakage characteristics of crushed stone and evaluate its use as the aggregate in the bedding course of permeable roads. The compaction process can be divided into two stages, i.e., the preliminary compaction stage and the particle crushing and intensive compaction stage. The latter consists of an alternating cycle of compacting and crushing. The particle size distribution after crushing can be described analogously to the Talbot continuous gradation equation. Single particle size samples are subject to earlier and stronger particle breakage than the mixed particle size sample, which are affected by both compaction level and loading speed. This study has important application value, and it provides experimental support for the study of materials for urban permeable roads.

Highlights

Introduction e National Meteorological Center ofChina Meteorological Administration issued multiple rainstorm yellow alerts since July 2020, and flooding has ravaged the streets of many Chinese cities (Figure 1). ere is a rising demand for sponge-like smart cities [1,2,3], the construction of which requires permeable roads as their underpinning
Crushed stone is widely used in constructing the bedding course of permeable roads because it has good water permeability, allows smooth transition of diffusive stress and load, and is readily available and can be obtained locally. is work studied the compaction performance and particle breakage characteristics of crushed stone as the aggregate of permeable roads and analyzed how they are influenced by particle size, gradation, etc. is study can provide experimental support for the study of materials for urban permeable roads, help address urban flooding in Chinese cities caused by frequent heavy rainfall, and can help build smart cities with sponge-like functionality
It could be seen that the particle breakage characteristics and the change of particle size strongly affect the stability of the sample structure

Summary

Introduction

Introduction e National Meteorological Center ofChina Meteorological Administration issued multiple rainstorm yellow alerts since July 2020, and flooding has ravaged the streets of many Chinese cities (Figure 1). ere is a rising demand for sponge-like smart cities [1,2,3], the construction of which requires permeable roads as their underpinning. China Meteorological Administration issued multiple rainstorm yellow alerts since July 2020, and flooding has ravaged the streets of many Chinese cities (Figure 1). Ere is a rising demand for sponge-like smart cities [1,2,3], the construction of which requires permeable roads as their underpinning. China introduced the concept of permeable road in the 1990s and gradually began its application in major cities since 2000. Meng et al [5] conducted a field survey on the permeability of permeable roads in Shanghai to summarize their application and analyze the factors affecting the actual permeability. E results show that Darcy’s law is not applicable to analyzing the directional water transport of permeable pavement materials. Wang [9] summarized the advantages of permeable concrete pavement and analyzed the factors affecting its mechanical

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Conclusion