Accession Number : AD0756440

Title :   Investigation of the Improved Carlson Stress Meter.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : McCoy,E. E. ; Mather,B.

Report Date : MAY 1957

Pagination or Media Count : 54

Abstract : The purpose of the investigation was to evaluate the suitability of the improved Carlson stress meter for use in 6-in. aggregate concrete. Four meters were tested in two 30- by 60-in. cylindrical concrete specimens. The concrete in one specimen contained aggregate graded to 1-1/2 in. in size, and in the other, to 6 in. in size. A rig for applying sustained load to specimens of this size was specially fabricated for these tests. The specimens, which also contained strain meters, were subjected to several loading tests and were checked for creep, recovery, and the effect of temperature variation. Results of the investigation indicate that the stress meters are sufficiently sensitive and independent of the effect of extraneous length changes for practical applications. (Author)

Descriptors :   (*MEASURING INSTRUMENTS, PERFORMANCE(ENGINEERING)), (*CONCRETE, STRESSES), TEST EQUIPMENT, LOADS(FORCES), STRAIN(MECHANICS), CREEP STRENGTH

Subject Categories : Construction Equipment, Materials & Supplies
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE