Assessing the strength of in situ Portland cement concrete by internal fracture tests* Available to Purchase

The results of a programme of about 1500 internal fructure tests performed on ordinary Portland cement concrete to assess its compressive strength are reported. The influence of the type and size of uggregate upon the test results is examined as well as the effect of precompression of the concrete. The variability of the data was assessed statistically to derive relationships between the results of internal fructure tests, i.e. the indicated maximum torques and cube strength US a basis for estimating the compressive strength of in situ concrete. Considerations affecting the use of internal fracture tests as a means of assessing the strength of concrete in structures in service are briefly discussed.