Potential Activity of Recycled Clay Brick in Cement Stabilized Subbase

Liang Liang,Song Song,Wang Wang,Tan Tan,Li Li,Guo Guo

doi:10.3390/app9235208

Liang Liang, Song Song + Show 4 more

Open Access

https://doi.org/10.3390/app9235208

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Journal: Applied sciences	Publication Date: Nov 29, 2019
Citations: 8	License type: CC BY 4.0

Affiliation: Jilin University, Jilin Meteorological Bureau

Abstract

Construction waste is one of the products in the process of urbanization. From the perspective of economy and environmental protection, this study used crushed construction waste clay brick to replace the fine aggregate of cement stabilized macadam subbase in certain proportions, and the optimum proportion was obtained according to the unconfined compressive strength of 7 days (d), 28 d, and 90 d. The “modified EDTA titration experiment" was also used to explain how the potential activity of construction waste clay brick works in cement stabilized macadam. The result obtained is that an optimal replacement ratio of 50% exists when using construction waste clay brick to replace the fine aggregate of cement stabilized macadam, and its unconfined compressive strength is higher than that of the 0% replacement ratio specimens; that is, the potential activity of the construction waste clay brick contributes the most to the unconfined compressive strength of the specimens at this proportion. According to the blending method and proportion obtained in this study, the application of construction waste clay bricks in a practical project can maximize environmental protection in road engineering and economic benefits simultaneously.

Highlights

Predictions show that a large amount of sand consumption in the future will create economic pressure on the construction industry and cause the erosion and degradation of the world’s major ecosystems
In order to reuse a large amount of construction waste, clay bricks ought to be used in road engineering, as it reduces the environmental and economic pressure
Unconfined compressive strength of cement stabilized macadam subbase is the main strength index in the structure designing process; combining with scanning electron microscopy (SEM) scanning, X-ray diffraction (XRD) scanning and "modified EDTA titration experiment", we studied the contribution of the potential activity of recycled construction waste clay brick aggregate (RBA) to the strength of cement stabilized macadam subbase and the activation mechanism of its potential activity

Summary

Introduction

Predictions show that a large amount of sand consumption in the future will create economic pressure on the construction industry and cause the erosion and degradation of the world’s major ecosystems. Due to the boom of the construction industry, the price of sand will increase significantly [1]. The large amount of construction waste produced by the process of demolition and reconstruction is one of the inevitable additional products in the process of urbanization. Among the construction waste includes a large number of waste concrete blocks, waste clay bricks, waste steel bars, waste wires and cables, waste plastic products, and so on. Marzouk and Azabbuilt a system dynamics methodology of the construction and demolition waste management sector by developing a dynamic model that is capable of studying the behavior of landfill process on both the short and long run and its impacts on the environment and economy. In Egypt, this system dynamics methodology results show that the recycling of construction and demolition waste would reduce the costs required to mitigate air pollution by $16,161.35 billion over 20 years [3]

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