Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 288, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.123121
Keywords
Chemo-damage-transport model; Volume changes; Chloride; Sulfate; Temperature
Categories
Funding
- National Natural Science Foundation of China [U1706222]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJB560004]
- China Postdoctoral Science Foundation [2019 M661693]
- Key Research and Development project of Ningxia Hui Autonomous Region [2018BFH03003]
- First-class Discipline project - Education Department of Shandong Province
- MOUNT TAI SHAN Scholar of Shandong Province [ts20190942]
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In this study, a chemo-damage-transport model for chloride diffusion was established to consider the effects of sulfate attack and temperature on chloride diffusivity in concrete, and validated by experimental results. The main conclusion drawn is the existence of a peak value of bound chloride ions.
Corrosion of reinforcement caused by chloride penetration has become the primary factor of concrete durability in the saline soil environment. A chemo-damage-transport model for chloride diffusion is studied, in which the effects of sulfate attack and temperature on chloride diffusivity in concrete are taken into consideration. Specifically, the volume changes of Friedel's salt and ettringite can cause the expansion and cracking of cement-based materials. Meanwhile, temperature has a significant influence on the reactions rates, mass transfer and ions diffusivity. The model is validated by published experimental results. The main conclusion is that there exists a peak value of the bound chloride ions. Near the exposed surface of the samples, the bound chloride content decreases with the increase of temperature. For the peak corresponding position and inward part, with the temperature rises, the bound chloride content in cement-based materials increases obviously. (c) 2021 Elsevier Ltd. All rights reserved.
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