WG2：Elucidating the degradation mechanism due to ASR and evaluating material properties and performance of structures

Staff introduction

• Chairman Kazuyuki Torii（Kanazawa University）
• Tetsuya Oyamada（Iwate University）
• Morihiro Mihara（Kanazawa University Visiting Associate Professor,（独）Japan Atomic Energy Agency）
• Yoshinori Okuda（ARS Consultants Co. Ltd）
• Masahiro Asada（ARS Consultants Co. Ltd）
• Makoto Tsuda（Ishikawa Prefecture）
• Takeshi Daidai（Toyama Prefecture）
• Chikao Sanno（Hokuriku Electric Power Co. Ltd）
• Teruhiko Sasatani（National land Development Center Co. Ltd.）
• Shuuzo Ura（National land Development Center Co. Ltd.）
• Toshihiko Minato（Tokyo Consultants Co. Ltd）
• Hiroyuki Kagimoto（Electric Power Development Co. Ltd）
• Masahiro Nomura（Fulltech Co. Ltd）
• Shinichi Hirono（Taiheiyo Consultant Co. Ltd）
• Kazuhiro Kobayashi（Mitsubishi Construction Co. Ltd）
• Akinori Sugiyama（Taiheiyo Cement Co. Ltd）
• Yūya Takahashi（The University of Tokyo，Collaboration with the SIP University of Tokyo group）

Overview

WG(2) studies on the mechanism of deterioration caused by Alkali-Silica Reaction (ASR). With both superstructure and substructure are objected, this research group plays a part in analyzing structural heath evaluation criteria based on the relationship between the elucidation of deterioration mechanism using degradation cases of previous RC-PC structures and the appraisal of loading capacity based on loading test carried on the ASR-degraded girder.

①Fabrication of ASR-affected PC.JIS girder (from now on, testing PC girder)
②Building a map of bridges affected by ASR degradation in Hokuriku region

The situation of the ASR-degraded infrastructure in Ishikawa Prefecture

③Elucidating the relationship between the rock-mineralogical characteristics of the aggregate in Hokuriku region and ASR degradation degree.
④Experimental and analytical study on the impact of the ASR expansion amount of concrete upon serviceability and load bearing capacity of RC-PC structures.
⑤Verification of serviceability and loading capacity by loading test on ASR-induced degradation PC testing girder prepared in ① and removal girders.
⑥Proposing ASR counter-measures by regional standardization of fly ash concrete.
⑦New proposal of management system of ASR degradation bridges based on ASR expansion amount.