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- W3029903282 endingPage "119638" @default.
- W3029903282 startingPage "119638" @default.
- W3029903282 abstract "Concrete structures and rock engineering projects are generally in uniaxial (principal stresses σ1 > σ2 = σ3 = 0), biaxial (σ1 ≥ σ2 > σ3 = 0) and triaxial (σ1 ≥ σ2 ≥ σ3 ≠ 0) stress states, and also frequently subjected to dynamic loads such as earthquake, high-velocity impact, drilling & blasting and explosive attacks. A series of experiments is conducted on cement and concrete specimens using a triaxial Hopkinson bar (Tri-HB) system, investigating mechanical properties and fracturing behaviour of concrete-like materials under the coupled static-dynamic loading conditions. Experimental results show that the values of dynamic uniaxial compressive strength (σUCd) of cement and concrete are much higher than those of static uniaxial compressive strength (σUCs), but decrease with increasing axial pre-stress from 0 to 30 MPa. The dynamic compressive strength under biaxial (σBCd) and triaxial (σTCd) static pre-stresses are around 2 and 3 times higher than σUCs, respectively. The values of σBCd are substantially sensitive to the pre-stresses (σ1 and σ2) and increase with the increase of σ2. Whereas the increment of σTCd is not obvious at triaxial compression conditions. Tested specimens are broken into small pieces under uniaxial pre-stress conditions, but exhibit slant-shear-failure mode under biaxial conditions. The peak strains under triaxial pre-stress states are much higher than those under biaxial and uniaxial conditions. The cement under dynamic triaxial compression shows significant plasticity deformation and microscopic damage due to the constraint of three-dimensional confining pre-stresses. The X-ray computed tomography (CT) images show internal microcracks under triaxial conditions." @default.
- W3029903282 created "2020-06-05" @default.
- W3029903282 creator A5051363890 @default.
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- W3029903282 date "2020-10-01" @default.
- W3029903282 modified "2023-10-16" @default.
- W3029903282 title "Experimental characterisation of mechanical behaviour of concrete-like materials under multiaxial confinement and high strain rate" @default.
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- W3029903282 doi "https://doi.org/10.1016/j.conbuildmat.2020.119638" @default.
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