Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition

LI Yugen; ZHANG Huimei; CHEN Shaojie; HU Dawei; GAO Wei

doi:10.13801/j.cnki.fhclxb.20220607.004

Volume 40 Issue 4

Apr. 2023

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Article Navigation > Acta Materiae Compositae Sinica > 2023 > 40(4): 2331-2342

LI Yugen, ZHANG Huimei, CHEN Shaojie, et al. Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2331-2342. doi: 10.13801/j.cnki.fhclxb.20220607.004

Citation:

LI Yugen, ZHANG Huimei, CHEN Shaojie, et al. Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2331-2342. doi: 10.13801/j.cnki.fhclxb.20220607.004

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Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition

doi: 10.13801/j.cnki.fhclxb.20220607.004

1.
School of Architecture Engineering, Yulin University, Yulin 719000, China
2.
School of Science, Xi'an University of Science and Technology, Xi'an 710054, China
3.
College of Architectural and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
4.
Shaanxi Shengyuan Tongtai Construction Engineering CO., LTD., Yulin 719000, China

Funds: National Natural Science Foundation of China (51868075); Yulin Science and Technology Bureau (2019-101-6); Yulin High-tech Zone Science and Technology Bureau (CXY-2021-10); Yulin University High Level Talent Research Start-up Fund (22GK11)

Received Date: 2022-03-30
Accepted Date: 2022-05-22
Rev Recd Date: 2022-05-04

Available Online: 2022-06-08

Publish Date: 2023-04-15

Abstract

Abstract

It is of great guiding significance to study the salt-frost degradation and reveal the degradation mechanism of aeolian sand concrete for its popularization and application. The salt-frost degradation rule of aeolian sand concrete was studied based on the fast indoor test and mechanical properties test, and its degradation mechanism was revealed from multi-scale combining with the SEM, XRD, NMR and damage mechanics theory. The results show that aeolian sand affects the frost resistance of concrete, and the optimal frost resistance is achieved with 100% aeolian sand replacement despite its low strength. The loss rates of mass and compressive strength increase with the increase number of salt-frost cycling, while the relative dynamic elastic modulus decreases with the increase number of salt-frost cycling. The salt-frost damage of aeolian sand concrete is dominated by physical-chemical effects, and the bone-slurry debonding in the interfacial transition zone (ITZ) and the cracking of the nearby mortar matrix are the main reasons for the degradation of its macroscopic physical and mechanical properties. Aeolian sand can change the pore structure of concrete and the moisture transmission path in it, thereby affects the pore saturation and the salt-frost resistance of concrete.
- aeolian sand concrete,
- salt-frost,
- durability,
- degradation mechanism,
- multi-scale
Long Abstrsct
Innovation Points

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References(30)

References

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