Study of the Improved Behavior of Portland Cement Mortar Based on Adsorption and Deposition of Microbial Cement
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 12
Abstract
Microbial cement (MC) can generate biocalcium carbonate on the surface of mortar in the liquid environment, which shows potential advantages to enhance the surface property of prefabricated components. This paper is aimed to investigate the cementation solution (CS) concentrations (0.5, 1.0, 1.5 M) and treatment times (3, 6, 9, 12 time) on capillary water absorption coefficient (coefficient k) and compressive strength of MC treated mortar, and attempted to point out the macroproperties and microstructure evolution mechanism of mortars based on adsorption and deposition of MC. The results indicated that when CS concentration was 0.5 M, the reduction rate of coefficient k increased from 29% to 76% with increasing treatment times from 3 to 12, and the growth rate of compressive strength also increased from 7.4% to 27.5%. For a CS concentration of 1.5 M, shorter less treatment times resulted in a significant reduction in coefficient k, whereas it had little effect on compressive strength. The adsorption and deposition of MC treated mortar surface led to an increase in the pore volume fraction of less harmful and harmless pore () in the near-surface layer by filling the pores with calcite and altering the content of hydration products. This process decreased the content of portlandite and increased that of calcite. Increasing the content of surface deposition was beneficial for reducing coefficient k, whereas improving the inner pore structure was beneficial for increasing compressive strength.
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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 authors greatly acknowledge the financial support from the National Key R&D Program of China (2022YFC3801600), the National Natural Science Foundation of China (52278273 and 52309167), the Key Research and Development Program of Hubei Province (2022BCA059), and the CRSRI Open Research Program (CKWV20221026/KY).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 12 • December 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Feb 15, 2024
Accepted: Apr 30, 2024
Published online: Sep 24, 2024
Published in print: Dec 1, 2024
Discussion open until: Feb 24, 2025
ASCE Technical Topics:
- Adsorption
- Building materials
- Cement
- Chemical processes
- Chemistry
- Compressive strength
- Concrete
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Hydraulic engineering
- Hydraulic properties
- Material mechanics
- Material properties
- Materials engineering
- Microbes
- Mortars
- Organisms
- Sorption
- Strength of materials
- Surface properties
- Water and water resources
- Water treatment
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