Mechanical behavior of rock-filled concrete with uniaxial compression

WANG Hui; MA Jiajun; ZHOU Hu; HE Shiqin; JIN Feng

doi:10.16511/j.cnki.qhdxxb.2021.21.019

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (2) : 339-346. DOI: 10.16511/j.cnki.qhdxxb.2021.21.019

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Mechanical behavior of rock-filled concrete with uniaxial compression

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Abstract

Uniaxial compression tests of rock-filled concrete (RFC) and self-compacting concrete (SCC) were used to measure the complete stress-strain curves for these samples. The results showed the failure modes, peak stresses, peak point strains, elastic moduli and full stress-strain curves of the rock-filled concrete and self-compacting concrete. The results show that the failure interface of the rock-filled concrete is not only the interface between the rockfill aggregate and the self-compacting concrete matrix, but also the fracture surface in the rockfill aggregate itself. During later failure stages, the rockfill structure reduces the slope of the falling section of the stress-strain curve for the rock-filled concrete specimen. The average peak stress of the rock-filled concrete was 29% less than for the self-compacting concrete, the peak strain was 51% less, and the average elastic modulus was 42% more. The shape and position of the rockfill aggregate and the bond between the rockfill aggregate and the self-compacting concrete all affect the mechanical properties of the rock-filled concrete, which makes the test results show the characteristics of large dispersion. The theoretical stress-strain curves for the rock-filled concrete and the self-compacting concrete agree well with the measured curves.

Key words

rock-filled concrete (RFC) / self-compacting concrete (SCC) / uniaxial compression / stress-strain curves / constitutive relation

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WANG Hui, MA Jiajun, ZHOU Hu, HE Shiqin, JIN Feng. Mechanical behavior of rock-filled concrete with uniaxial compression[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(2): 339-346 https://doi.org/10.16511/j.cnki.qhdxxb.2021.21.019

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