ความสัมพันธ์ของพฤติกรรมการขยายตัวและปรากฏการณ์ของ ASR

Abstract

This paper reports the ASR evidence and expansion behavior of cored samples from the existing structure. This is aimed to provide the local information that has not been reported before, and to evoke the public recognition of ASR behavior and its damage to concrete structures. The simple technique to identify ASR evidence by using uranyl acetate and UV light was employed, accompanied with the accelerated expansion test, using warm water 38 °C and NaOH solution under high temperature. The ASR gel was abundantly found at the aggregate’s rim as well as in cracks, but the variation of the evidence for different samples was also found. This may affect the different rate of expansion. The warm water test results confirmed the evidence of expansion in some samples and its continued trend. The maximum expansion under high temperatue NaOH solution of 0.23% was reported at the age of 64 days. However, under the limited   number of sample and scope of study, the results indicate the need of further investigation to accurately predict the cause of structure’s deterioration.