Stable Time for Microstructural Parameters of Fly-Ash Concrete and Its Influence on Chloride-Diffusion Stability
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 1
Abstract
Based on exposure tests in a natural tidal environment, free chloride concentrations in concrete with different fly ash contents and exposure times were tested, and the apparent and instantaneous chloride diffusion coefficients of different fly ash contents were analyzed. Microstructural parameters such as porosity were analyzed using nuclear magnetic resonance (NMR) test results. The time-dependent model and analysis method of stable time for microstructural parameters is presented, and the time-dependent and stable time of microstructural parameters with different fly ash contents were studied. The relationship between stable time for chloride diffusivity and stable time for microstructural parameters was analyzed. Results show that chloride concentrations and chloride diffusion coefficients both have a linearly increasing relationship with exposure time and fly ash content increase. The stable time for chloride diffusion coefficients decreased as fly ash content increased. The total porosity and contributive porosity of large capillary pores (100–1,000 nm) generally decreased with the increasing exposure time, which is consistent with the time-dependent chloride diffusion coefficients. Increasing fly ash content had an obvious effect on reducing the contributive porosity of large capillary pores (100–1,000 nm) in concrete. The stable time for contributive porosity of large capillary pores (100–1,000 nm) decreased with increasing fly ash content. Whether fly ash was added or not, the contributive porosity of large capillary pores (100–1,000 nm) stabilized at first, and the stable time was the most important factor affecting the stable time for instantaneous chloride diffusion coefficient of concrete, providing a reference for predicting the stable process of macroscopic permeability from a microscopic view.
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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 acknowledge and appreciate the support received from the Natural Science Foundation of Zhejiang Province (LY19E090006, LY17E090007, and LQ18G010007) and the National Natural Science Foundation of China (52079124 and 51279181). Thanks are due to Associate Professor Chuanqing Fu, JianDong Wang, and master’s students Meng Lv, Runhua Fang, LinCong Fang, and Xiaoyun Zhou for assistance with the experiments.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 1 • January 2023
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© 2022 American Society of Civil Engineers.
History
Received: Nov 30, 2021
Accepted: May 4, 2022
Published online: Oct 22, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 22, 2023
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