Journal
CEMENT AND CONCRETE RESEARCH
Volume 139, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2020.106284
Keywords
External sulfate attack; Sulfate solution concentration; Temperature; Calcium leaching; Numerical modeling
Funding
- National Natural Science Foundation of China [51678200, 51678205, 51978211, 51878225]
- Science and Technology Planning Project of Shenzhen Municipality [JCYJ20170811160514862]
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The study experimentally validated a coupled chemo-transport model for external sulfate attack on concrete, showing that higher concentrations of sulfate solution and temperatures increase the concentration of sulfate ions in concrete. The research concluded that these parameters primarily affect external sulfate attack through the chemical reaction process.
The work reports on an experimental programme, conducted to validate comprehensively our previously proposed coupled chemo-transport model for external sulfate attack on concrete. Specifically, the effects of the concentration of sulfate solution and temperature on the distribution of sulfate ions in concrete are experimentally investigated and used to demonstrate the accuracy of the modeling framework. Further, the profile of aluminate depletion and the leaching depth numerically are investigated. For all cases the model predictions are in good agreement with the experimental results, showing increases of the concentration of sulfate ions in concrete with higher concentrations of sulfate solution and higher temperatures. It is concluded that higher sulfate solution concentration and temperature enhance the processes involved in the external sulfate attack on concrete, namely diffusion of sulfate ions and their chemical reactions with concrete. It is found that these parameters affect the external sulfate attack predominantly via the chemical reaction process.
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