Green Disposal of Domestic Wastewater in Alkali-Activated Slag Mortar: Enhancing Performance and Sustainability
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
The global increase in water consumption has led to significant domestic wastewater (DW), with only 55.5% being treated properly. Discharging untreated DW has serious environmental consequences and wastes a valuable resource. Therefore, this study proposed replacing 25%–100% potable water with DW in preparing alkali-activated slag (AAS) mortars. The results indicated that the use of DW promoted the hydration of AAS. Pore structure analysis revealed that DW enhanced the formation of gel pores while reducing mesopores, resulting in a higher elastic modulus and a denser microstructure of AAS mortars. Consequently, the compressive strength of AAS mortars increased by 9.0%–20.3%, and the autogenous shrinkage decreased by 7.5%–34.5%. Moreover, replacing 100% of potable water with DW maximizes its utilization and improves the cost–benefit and eco-efficiency of AAS mortars by 9.4% and 10.0%. These findings demonstrate the feasibility of using DW as mixing water for AAS mortars, offering a sustainable approach to the utilization of DW.
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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
This work was supported by the Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology (2022yjrc27) and the Anhui Provincal Housing and Urban-Rural Construction Science and Technology Project (2022-YF071).
Author contributions: Yonghui Wang: Conceptualization, Writing–original draft, Methodology, Resources. Xin Shen: Reviewing, Editing, Supervision. Jin Li: Resources, Reviewing, Editing, Supervision. Zeren Chen: Investigation, Reviewing. Shangkun Li: Investigation, Visualization. Jingjing Fang: Investigation.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 25, 2023
Accepted: Feb 27, 2024
Published online: Jun 25, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 25, 2024
ASCE Technical Topics:
- Alkalinity and acidity
- Building materials
- Business management
- Chemical properties
- Chemistry
- Compressive strength
- Engineering materials (by type)
- Environmental engineering
- Material mechanics
- Material properties
- Materials engineering
- Mortars
- Municipal wastewater
- Practice and Profession
- Slag
- Strength of materials
- Sustainable development
- Wastewater management
- Wastewater treatment
- Water treatment
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