Experimental study on mechanical properties, failure, and dilatacy behaviour of high and ultra high strenth concrete under triaxial compressive stress
DOI:
https://doi.org/10.14311/Keywords:
High and ultra high strength concrete, Triaxial compression, Failure modes, Peak stress, Dolatacy behaviour, Volumetric modelAbstract
To study the mechanical properties of high- and ultra-high-strength concrete, the conventional triaxial tests were carried out on four types of concrete with different strengths under six levels of confining pressure. The influence on the failure mode, strength, deformability, and dilation properties of four kinds of concrete with different strengths by the confining pressure was studied. The test results show that: the cracks generated in high strength concrete always bypassed the coarse aggregate, while in ultra-high-strength concrete, the cracks mainly passed through the coarse aggregate. With increasing confining pressure, the peak stress and stress of dilatancy onset of four types of concrete increase, and the corresponding strain at peak stress and dilatancy onset mount approximately linearly. The enhancement of the confining pressure on the peak stress, stress of dilatancy onset, strain at the peak stress and dilatancy onset in a negative relation to the uniaxial compressive strength of concrete. The peak volumetric strain of concrete increases as the confining pressure mounts. Under the same condition of confining pressure, the lower the uniaxial compressive strength is, the higher the volumetric strain is. The parameters were modified to make the volumetric model more suitable to describe the change law of volume for high- and ultra-high-strength concrete with a wider range of confining pressure levels. The failure envelopes of four kinds of concrete under uniaxial and triaxial stress states were obtained by using the nonlinear Mohr-Coulomb criterion.
Received: 26.09.2024
Received in revised form: 11.04.2025
Accepted: 24.11.2025
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