Reusing Waste Concrete Recycled Powder in Mortar: Paste Substitution versus Cement Substitution
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 5
Abstract
Waste concrete recycled powder (WCRP) occupies up to 30% of crushed old concrete and is hard to be reutilized due to its high porosity and low cementitious reactivity. Traditionally, the WCRP is reused as cement substitution in mortar/concrete production, but this substitution method has certain disadvantages. In this research, a novel substitution method, called the paste substitution method, was applied by replacing part of the cement paste with WCRP; a total of 28 trial mortar mixes containing WCRP added as either paste substitution or cement substitution were made for evaluation and analysis. By comparing the test results, it could be found that the incorporation of WCRP using the paste substitution method can remarkably enhance the compressive strength by at most 38.3%, densify the microstructure, and meanwhile greatly reduce the cement consumption by at most 26.7%. The cementing efficiency factor of WCRP in compressive strength was calculated for the first time, and its value is 0.289. Regression analysis showed that there exists good correlation between the compressive strength and effective water/cementitious materials (W/CM) ratio.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work described in this paper was fully supported by National Natural Science Foundation of China (Project No. 51608131), Natural Science Foundation of Guangdong Province (Project No. 2021A1515011747), Pearl River S&T Nova Programme of Guangzhou City (Project No. 201906010064), Science and Technology Planning Project of Guangzhou City (Project No. 2023A03J0088), Guangzhou University Research Project - Talent Class (Project No. RC2023004), and the European Regional Development Fund (Project No. 01.2.2-LMT-K-718-03-0010) under a grant agreement with the Research Council of Lithuania (LMTLT).
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Journal of Materials in Civil Engineering
Volume 36 • Issue 5 • May 2024
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© 2024 American Society of Civil Engineers.
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Received: Jun 8, 2023
Accepted: Oct 23, 2023
Published online: Feb 23, 2024
Published in print: May 1, 2024
Discussion open until: Jul 23, 2024
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