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Open AccessArticle

Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method

by Kui Hu 1, Yujing Chen 1,2,*, Caihua Yu 1, Dong Xu 3, Shihao Cao 1 and Rui Pang 1,*
1
College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China
2
Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA
3
Shenzhen Municipal Design and Research Institute Co., Ltd., Shenzhen 518029, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(13), 2893; https://doi.org/10.3390/ma13132893
Received: 30 April 2020 / Revised: 22 June 2020 / Accepted: 24 June 2020 / Published: 27 June 2020
(This article belongs to the Special Issue Silicate Solid Waste Recycling)
Mixed recycled aggregates (MRA) from construction and demolition waste (CDW) with high-purity and environmental performance are required for highway construction application in base layer and precast concrete curbs. The main problematic constituents that reduce the quality level of the recycled aggregates applications are brick components, flaky particles, and attached mortar, which make up a large proportion of CDW in some countries. This paper studies the potential of brick separation technology based on shape characteristics in order to increase the recycled concrete aggregates (RCA) purity for MRA quality improvement. MRA after purification was also processed with surface treatment experiment by rotating in a cylinder to improve the shape characteristics and to remove the attached mortar. The purity, strength property, densities, water absorption ratio, shape index, and mortar removal ratio of MRA were studied before and after the use of the brick separation and surface treatment proposed in this study. Finally, the recycled aggregates upgradation solution was adopted in a stationary recycling plant designed for a length of 113 km highway construction. The properties of CDW mixed concrete for precast curbs manufacturing were conducted. The results indicate that problematic fractions (brick components, particle shape, and surface weakness) in the MRA were significantly reduced by using brick separation and surface treatment solution. Above all, it is very important that the proposed brick separation method was verified to be practically adopted in CDW recycling plant for highway base layer construction and concrete curbs manufacturing at a low cost. View Full-Text
Keywords: construction and demolition waste; recycled aggregates; brick separation; surface treatment construction and demolition waste; recycled aggregates; brick separation; surface treatment
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Hu, K.; Chen, Y.; Yu, C.; Xu, D.; Cao, S.; Pang, R. Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method. Materials 2020, 13, 2893.

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