It is important to manage the disposal of construction and demolition wastes in an economical and environmentally friendly way. Reuse of recycled materials generated from construction and demolition wastes to produce ‘green’ construction materials is a promising area. Recycled powder can be produced from abandoned clay bricks or concrete. The chemical compositions and physical properties of the recycled powder are first studied by a series of tests, including scanning electron microscopy and X-ray diffraction analysis. An experimental programme is designed to investigate the mechanisms by which the recycled powder contributes to the strength of cementitious composites. It is found that the strength contribution of recycled powder is by means of a micro-aggregate effect, hydration and pozzolanic activity. The hydration activity of recycled powder contributes mainly to the early strength, and pozzolanic activity to the strength at a later stage. To promote the pozzolanic activity of recycled powder, different chemical activators are investigated. Two chemical activators are selected and their effect on the pozzolanic activity of recycled powder is verified.
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December 2019
Research Article|
March 06 2019
Investigation of recycled powder as supplementary cementitious material
Peng Zhu;
Peng Zhu
Assistant Professor, Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, P. R. China
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XinQi Mao;
XinQi Mao
PhD candidate, Assistant Professor, Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China; Department of Engineering, Qingdao Agricultural University, Qingdao, P. R. China
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Wenjun Qu
Wenjun Qu
Professor, Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, P. R. China (corresponding author: quwenjun.tj@tongji.edu.cn)
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Publisher: Emerald Publishing
Received:
October 25 2018
Revision Received:
December 29 2018
Accepted:
January 24 2019
Online ISSN: 1751-763X
Print ISSN: 0024-9831
ICE Publishing: All rights reserved
2019
Magazine of Concrete Research (2019) 71 (24): 1312–1324.
Article history
Received:
October 25 2018
Revision Received:
December 29 2018
Accepted:
January 24 2019
Citation
Zhu P, Mao X, Qu W (2019), "Investigation of recycled powder as supplementary cementitious material". Magazine of Concrete Research, Vol. 71 No. 24 pp. 1312–1324, doi: https://doi.org/10.1680/jmacr.18.00513
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