Strength characteristics and constitutive model of rubber-sand-polyurethane composites after freeze-thaw cycles

YIN Pingbao; YU Wei; YANG Zhaohui; LUO Peiting

doi:10.13801/j.cnki.fhclxb.20210804.003

Volume 39 Issue 7

Jul. 2022

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Article Navigation > Acta Materiae Compositae Sinica > 2022 > 39(7): 3415-3427

YIN Pingbao, YU Wei, YANG Zhaohui, et al. Strength characteristics and constitutive model of rubber-sand-polyurethane composites after freeze-thaw cycles[J]. Acta Materiae Compositae Sinica, 2022, 39(7): 3415-3427. doi: 10.13801/j.cnki.fhclxb.20210804.003

Citation:

YIN Pingbao, YU Wei, YANG Zhaohui, et al. Strength characteristics and constitutive model of rubber-sand-polyurethane composites after freeze-thaw cycles[J]. Acta Materiae Compositae Sinica, 2022, 39(7): 3415-3427. doi: 10.13801/j.cnki.fhclxb.20210804.003

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Strength characteristics and constitutive model of rubber-sand-polyurethane composites after freeze-thaw cycles

doi: 10.13801/j.cnki.fhclxb.20210804.003

YIN Pingbao^{1, 3
,
,},
YU Wei^{1, 3},
YANG Zhaohui^{1, 2},
LUO Peiting^{1, 3}

1.
School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
2.
University of Alaska Anchorage, Anchorage 99508, Alaska, USA
3.
National-Local Joint Laboratory of Engineering Technology for Long-Term Performance Enhancement of Bridges in Southern District, Changsha University of Science & Technology, Changsha 410114, China

Received Date: 2021-06-11
Accepted Date: 2021-07-28
Rev Recd Date: 2021-07-19

Available Online: 2021-08-05

Publish Date: 2022-07-30

Abstract

Abstract

The improvement methods and strength properties of scrap tire granular materials are the research basis on the frost resistance performance improvement of piles in cold regions. Several composite samples were made according to the mass ratio of rubber∶sand∶polyurethane = 3∶2∶1. The stress-strain curves of samples under different temperatures, confining pressures and number of freeze-thaw cycles were obtained by triaxial tests. The test results show that the stress-strain curve of rubber-sand-polyurethane composite has no obvious peak point, and has obvious strain hardening characteristic. The failure strength of the sample increases with the decrease of temperature, and increases by 15.0% when the test temperature decreases by 5.0℃ for frozen samples. The failure strength values of samples decrease with the increase of freeze-thaw cycles, but the average decrease is less than 5.0%. The effect of confining pressures on the failure strength of the 20.0℃ sample is about 15.0%, while that of the frozen samples is less than 5.0%. The sensitivity analysis shows that the temperature has the greatest impact on the failure strength of rubber-sand-polyurethane composites, while the confining pressure and the number of freeze-thaw cycles have little effect. The rubber-sand-polyurethane composites have the characteristics of moderate strength, stable structure and freeze-thaw resistance. The stress-strain constitutive model of rubber-sand-polyurethane composite after consideration of the temperature, confining pressure and freeze-thaw cycle was established, and the rationality of the model parameters fitting formula was verified.
- rubber,
- polyurethane,
- freeze-thaw cycle,
- strength property,
- constitutive model
Long Abstrsct
Innovation Points

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References(32)

References

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