The service life prediction of concrete in cold region by model specimen and reliability theory.

概要

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　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.
北見工業大学の論文