Study on the influence of bean board on neutralization and reinforcement corrosion of reinforced concrete

2016 Fiscal Year Final Research Report

• Project/Area Number: 25820278
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Building structures/Materials
• Research Institution: National Institute for Land and Infrastructure Management (2016); Building Research Institute (2013-2015)
• Principal Investigator: Tsuchiya Naoko 国土技術政策総合研究所, 建築研究部, 主任研究官 (60646636)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: コンクリート / 豆板 / 中性化 / 吸水乾燥繰り返し / 不均質

Outline of Final Research Achievements

The aims of this research is to grasp the influence of the internal defect defective bean board, which is more likely to promote degradation in the reinforced concrete member, neutralization acceleration experiment and water absorption drying repeated experiment were carried out by using simulated test specimens.
As a result, neutralization progressed spatially and temporally inhomogeneously with respect to the depth direction. A lot specimens promote neutralization 1.0 to 2.5 times faster than standard one, there were also those which became 5 times or more, in this research. Also, it was confirmed that the neutralization proceeded ahead of the bean board which exists inside more. In addition, it was measured that the water content at the time of repetitive water absorption drying tends to become larger as the bean board is located inside than the surface layer.

Free Research Field

建築材料