Utilization of -Cured Waste Cement Powder to Enhance the Properties and Microstructure of Cement Mortar and Paste
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
Utilization of waste concrete has been become an urgent requirement for sustainable development due to the huge amounts of construction waste. The most promising strategy is to treat construction wastes by curing. This study investigates the properties and microstructure of cement mortar with -cured waste cement powder (CWCP). The results showed the CWCP showed a rapid pH value decline from 12.9 to 10.2 within 12 h, the value was maintained at 8.4, and showed no obvious change after carbonation after 72 h. The uptake of CWCP increased rapidly in the first 2 h and reached 26.4% at 168 h. The C-S-H, , and traces of ettringite in waste cement powder (WCP) were transformed to calcium carbonate and silica gel after carbonation treatment. The flowability of cement mortar decreased with addition of WCP and CWCP content. The compressive strength of cement mortar with WCP decreased with replacement of cement beyond 10%, and incorporation of below 20% CWCP increased the compressive strength of mortar. In addition, the replacement of cement with 10%–20% CWCP or 10% WCP showed a lower water absorption compared with control cement mortar. The presence of calcium carbonate in the CWCP resulted in the formation of monocarbonate, which stabilized the ettringite and led to a denser microstructure compared with control cement paste.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
The work was supported by the Jiangsu Agricultural Science and Technology Innovation Fund (CX(19)2041) and Joint Open Fund of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (JH201845).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 12, 2021
Accepted: Feb 2, 2022
Published online: Jul 20, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 20, 2022
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