Accession Number : AD0637722

Title :   INVESTIGATION OF THE IMPROVED CARLSON STRESS METER. REPORT 2. SUPPLEMENTARY TESTS.

Descriptive Note : Technical rept.

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : McCoy,Ernest E. , Jr

Report Date : JUL 1966

Pagination or Media Count : 20

Abstract : In 1953, three 30- by 60-in. concrete cylinders containing embedded stress meters and strain meters were fabricated and subjected to extensive laboratory testing to investigate the performance of the stress meters. Two of the cylinders were destructively tested during that investigation. The two stress meters in the one remaining cylinder were checked in 1962 and determined to be in operating condition; plans for supplementary loading tests were then made. These supplementary tests, conducted in 1965 when the specimen was 12 years old, are described in this report. In these tests the specimen was subjected to two cycles of incremental loading (maximum load of 682 psi) and one direct loading of 1150 psi. One stress meter had become inoperative between 1962 and 1965. Results show that the other meter performed satisfactorily. Results also show that when stress meters are to be embedded in a structure great care must be taken to ensure that adequate compaction of the concrete is achieved in the area adjacent to the meters. (Author)

Descriptors :   (*MEASURING INSTRUMENTS, STRESSES), CONCRETE, LOADS(FORCES), PERFORMANCE(ENGINEERING)

Subject Categories : Ceramics, Refractories and Glass
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE