Development of Repairing Technology of Concrete Exposed to Fire

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289185
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: Yamaguchi University
• Principal Investigator: Li Zhuguo 山口大学, 理工学研究科, 准教授 (50432737)
• Co-Investigator(Kenkyū-buntansha): OHKUBO TAKAAKI 広島大学, 大学院工学研究院, 教授 (60185220)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: コンクリート / 火害 / 性能回復 / 補修 / 力学性能 / 耐久性

Outline of Final Research Achievements

Firstly we investigated the changes of various properties of fire-damaged concrete after re-curing, including compressive strength, Young modulus, bond strength, freezing and thawing resistance, mass, and volume,etc., and clarified the effects of strength levels before heated, heating temperatures, cooling methods, re-curing methods, and re-curing duration on the property recovery degrees. Furthermore, we examined the hydrates (Ca(OH)2, CSH), pore volume and size, inside and surface cracks of fire-damaged concrete right after heated and after re-cured, to clear the mechanism of property recovery. Moreover, a new repairing material was developed for fire-damaged concrete, which is mainly made of wastes such as fly ash and molten slag of municipal waste incineration residue, following the developments of setting retarder and drying shrinkage reducers.

Free Research Field

建築材料