2022 Fiscal Year Research-status Report
Modeling and re-corrosion evaluation of patch repaired concrete subjecting to chloride attack
| Project/Area Number |
19K04547
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| Research Institution | Saitama University |
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Principal Investigator |
欒 堯 埼玉大学, 理工学研究科, 助教 (20725288)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | patch repaired concrete / chloride / water repellency / crack / corrosion / multi-scale model |
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| Outline of Annual Research Achievements |
In FY2022, water penetration and chloride migration of repair materials that were treated with water repellent agents, as well as their shrinkage and strength properties, were studied experimentally. The results indicated that the combination of hydrophobic treatment with repair materials effectively improved water and chloride penetration resistance under cracked conditions. Shrinkage was also reduced for treated repair materials, but the reduction of strength still remains an issue that needs to be solved in the future. In addition, bond strength of repair material and concrete substrate was also tested with different interfacial treatment and concrete removal technology. For the steel corrosion of patch repaired concrete, the influence of crack width in repair materials has also been tested. It was found that corrosion degree increased with increasing crack width, which accelerated chloride penetration significantly.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The progress of experimental and analytical studies on water and chloride penetration of patch repaired concrete followed the research plan. Regarding the corrosion of steel bars in patch repaired concrete, the experiment work was late in last fiscal year because of the Covid-19. In this year, the corrosion test has been started and the progress generally followed the plan.
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| Strategy for Future Research Activity |
In the FY2023, steel corrosion test of patch repaired concrete will be continued for including more factors such as temperature and relative humidity as well as repair material type. Comparison between the test and numerical analysis will also be performed.
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| Causes of Carryover |
the remaining amount will be used to purchase consumables for experiment
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