METHOD FOR TESTING DURABILITY OF CONCRETE SAMPLE, CONCRETE SAMPLE CONTAINER FOR ULTRASONIC MEASUREMENT USED IN THE METHOD, AND FREEZING-THAWING TEST AUTOMATIC MEASURING APPARATUS USING THE CONTAINER

摘要

PROBLEM TO BE SOLVED: To accurately and correctly convert a deterioration state of a concrete sample in a numeral form, by repeating cooling freezing and heat thawing, and measuring a propagation speed of ultrasonic waves propagating in the concrete sample. ;SOLUTION: This freezing-thawing test automatic measuring apparatus includes an ultrasonic wave generation apparatus (a), a freezing-thawing bath (b), a control part (d) and a system controller (s). A concrete sample (f) stored in a container c1 is repeatedly alternately cooled to be frozen and heated to be thawed. While the concrete sample (f) is kept in the container c1, a propagation speed of ultrasonic waves propagating in the concrete sample (f) immediately after fused is measured with the use of the ultrasonic wave generation apparatus (a) for every constant cycle of the freezing-thawing. A deterioration with time of the concrete sample (f) resulting from the repeated freezing-thawing is automatically measured. Since it is not necessary to taken in and out of the container c1 the concrete sample (f) which weighs large, a test time is shortened.;COPYRIGHT: (C)1999,JPO