2026-03-09T18:04:32Z https://kitami-it.repo.nii.ac.jp/oai

oai:kitami-it.repo.nii.ac.jp:00006703 2025-01-30T05:34:50Z 7:15:46

The service life prediction of concrete in cold region by model specimen and reliability theory. Hiroshi, SAKURAI Koichi, AYUTA Noboru, SAEKI Kaneyoshi, OKADA Hiroaki, ARAI Hiroshi, SAKURAI Koichi, AYUTA Noboru, SAEKI Kaneyoshi, OKADA Hiroaki, ARAI application/pdf The purpose of this study is to examine how durability can be evaluated and deterioration estimated for reinforced concrete structual members in a cold environment. Under such conditions, concrete components suffer frost damage and steel corrosion. Model specimens of size 10×10×40 cm were developed ； these are suitable for rapid freez-thaw tests according to ASTM C 666， exposure testing， and load testing. Case studies were carried out in which many external factors. From the data obtained， an evaluation of the durability of concrete was induced by using a reliability function (R(t)). In the case of a water-cement ratio of 45 ％，the reliability in the case of set-up ratio to initial ultimate strength becomes unreliable ? that is，the reliability falls below the assumed set-up ratio of 0.95 by neary 0.85％?at about 300 cycles. 　In the case of a water-cement ratio of 45 ％，the reliability in the case of set-up ratio to initial ultrasonic velocity becomes unreliable?that is, the reliability falls below the assumed set-up ratio of 0.90 by neary 70％?at about 300 cycles. Thus，the durability of cocrete is influenced by the number of freeze-thaw cycles. 北見工業大学 1993-09 eng departmental bulletin paper https://kitami-it.repo.nii.ac.jp/records/6703 北見工業大学研究報告 25 1 71 79 https://kitami-it.repo.nii.ac.jp/record/6703/files/25-1-8.pdf application/pdf 3.3 MB 2016-11-22