Exploring Pore Structure Characteristics of Alkali Residue-Based Foamed Concrete and Their Effect on Compressive Properties: Insights from Low-Field Nuclear Magnetic Resonance Analysis
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
Based on investigated mechanical properties of alkali residue-based foamed concrete (A-FC), this paper presents a comprehensive examination of the microstructural features of A-FC and their impact on compressive properties. A detailed investigation of the compressive performance and pore structure characteristics was conducted through compression tests and low-field nuclear magnetic resonance (NMR) tests. The results demonstrate that the primary pore size in A-FC falls within the microscale, and the pores can be categorized into three types—gel pores, capillary pores, and air voids. In addition, the spectrum of A-FC exhibits three distinct relaxation peaks, each of which is attributed to different water components, i.e., adsorbed water, pore water, and free water. As the pore size, air void ratio, and porosity increase, the compressive strength of A-FC decreases. The main reasons for the increased in strain in low-strength A-FC include compression at the bottom, internal stress dissipation through the pore structure, and changes in the failure mode.
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Data Availability Statement
Some or all data, models, and code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was jointly supported by the National Natural Science Foundation of China (Grant 42277146), Graduate Research and Innovation Projects of Jiangsu Province (Grant SJCX23_0074), and Fundamental Research Funds for the Central Universities (2242023K40018 and 2242023K30057).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 12, 2023
Accepted: Feb 2, 2024
Published online: Jun 18, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 18, 2024
ASCE Technical Topics:
- Alkalinity and acidity
- Chemical properties
- Chemistry
- Compression
- Compressive strength
- Concrete
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Forces (type)
- Magnetic fields
- Material mechanics
- Material properties
- Materials engineering
- Mechanical properties
- Solid mechanics
- Strength of materials
- Structural behavior
- Structural dynamics
- Structural engineering
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