Versuchsanlage zur ermittlung der dreiachsigen festigkeit von beton mit ersten versuchsergebnissen

The testing machine for investigations on the triaxial stress-strain-behaviour of concrete consists of a rigid prestressed concrete frame with jacks of 2000 kN (compression) and 300 kN (tension) respectively. To avoid lateral restraint brush-bearing platens were used. The dimensions of the specimens were 10/10/10 cm. The first tests were carried out to gain experience in operating this apparatus. The results were as follows: The deformation under triaxial compression was much higher than that under uni- or biaxial loading. The ultimate strength increases when the stress-relation almost reaches the hydrostatic pressure (6 times or more than the uniaxial strength). The ultimate strength under repeated loading is much less than the ultimate strength under the first loading.