Development of an innovative inspection and soundness diagnosis method for concrete structures using perspective technology

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289133
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Hokkaido University
• Principal Investigator: SUGIYAMA TAKAFUMI 北海道大学, 工学(系)研究科(研究院), 教授 (70261865)
• Co-Investigator(Kenkyū-buntansha): 志村 和紀 北海道大学, 工学(系)研究科(研究院), 助教 (60187474) ; ヘンリー マイケル・ワード 北海道大学, 工学(系)研究科(研究院), 助教 (80586371)
• Research Collaborator: PROMENTILLA Michael De La Salle University
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: コンクリート / X線CT / 劣化機構 / 非破壊診断

Outline of Final Research Achievements

This research has focused on X-ray CT as a nondestructive diagnostic method for concrete structures. Varied mechanisms of the alteration due to load application, water attack, carbonation, freezing and thawing action and the reinforcement corrosion were clarified.
Deformed reinforcing bar embedded in concrete was clearly extracted. In addition, the amount of cross section reduction of electrically corroded rebar was calculated. A part of the cross section corroded in the early period and then spread over the entire cross section. The core was collected from the bottom surface of the road bridge RC slab, and as the crack length increased, chloride ions permeated deep. However, the influence of the crack width was not large. Furthermore, when carbonated and passed through water, the portlandite in the cracked concrete disappeared relatively earlier. With continuous water flow the surroundings of the aggregate eventually weakened, and the paste itself flowed out due to the leaching.

Free Research Field

コンクリート工学