2026-03-09T18:35:01Z 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 33814 Koichi, AYUTA 33815 Noboru, SAEKI 33816 Kaneyoshi, OKADA 33817 Hiroaki, ARAI 33818 Hiroshi, SAKURAI 33819 Koichi, AYUTA 33820 Noboru, SAEKI 33821 Kaneyoshi, OKADA 33822 Hiroaki, ARAI 33823 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. departmental bulletin paper 北見工業大学 1993-09 application/pdf 北見工業大学研究報告 1 25 71 79 https://kitami-it.repo.nii.ac.jp/record/6703/files/25-1-8.pdf https://kitami-it.repo.nii.ac.jp/records/6703 eng