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

被引：0

作者：

Li Y. ^{[1
]}

Zhang H. ^{[2
]}

Chen S. ^{[3
]}

Hu D. ^{[1
]}

Gao W. ^{[4
]}

机构：

[1] School of Architecture Engineering, Yulin University, Yulin

[2] School of Science, Xi'an University of Science and Technology, Xi'an

[3] College of Architectural and Civil Engineering, Xi'an University of Science and Technology, Xi'an

[4] Shaanxi Shengyuan Tongtai Construction Engineering Co., Ltd., Yulin

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 04期

基金：

中国国家自然科学基金;

关键词：

aeolian sand concrete; degradation mechanism; durability; multi-scale; salt-frost;

D O I：

10.13801/j.cnki.fhclxb.20220607.004

中图分类号：

学科分类号：

摘要：

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. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：2331 / 2342

页数：11

共 30 条

[1] ZHAO Yanru, LIU Fangfang, WANG Lei, Et al., Modeling of compressive strength of concrete based on pore structure under single-side freeze-thaw condition, Journal of Building Materials, 23, 6, pp. 1328-1336, (2020)
[2] WU Hairong, JIN Weiliang, ZHANG Fengjian, Et al., A state-of-the-art review on freeze-thaw damage characteristics of concrete under environmental actions[J], China Civil Engineering Journal, 51, 8, pp. 37-46, (2018)
[3] KUANG Yachuan, CHEN Yujie, FENG Jinren, Et al., Freezing-thawing damage of high speed railway bridges in cold region[J], China Railway Science, 40, 2, pp. 39-45, (2019)
[4] SHANG H S, SONG Y P., Experimental study of strength and deformation of plain concrete under biaxial compression after freezing and thawing cycles[J], Cement and Concrete Research, 36, 10, pp. 1857-1864, (2006)
[5] LUO Daming, NIU Ditao, SU Li, Research progress on durability of stressed concrete under environmental actions, Engineering Mechanics, 36, 1, pp. 1-14, (2019)
[6] SICAT E, GONG F Y, UEDA T, Et al., Experimental investigation of the deformational behavior of the interfacial transition zone (ITZ) in concrete during freezing and thawing cycles[J], Construction and Building Materials, 65, pp. 122-131, (2014)
[7] LI S G, CHEN G X, JI G J, Et al., Quantitative damage evaluation of concrete suffered freezing-thawing by DIP technique[J], Construction and Building Materials, 69, pp. 177-185, (2014)
[8] ZHOU S B, LIANG J L, XUAN W A., The correlation between pore structure and macro durability performance of road concrete under loading and freeze-thaw and drying wetting cycles[J], Advances in Materials Science and Engineering, 2017, (2017)
[9] ZHANG M H, ZHU X Z, SHI J Y, Et al., Utilization of desert sand in the production of sustainable cement-based materials: A critical review[J], Construction and Building Materials, 327, (2022)
[10] MARIA G, ELIPE M, LOPEZ-QUEROL S., Aeolian sands: Characterization, options of improvement and possible employment in construction− The state of the art[J], Construction and Building Materials, 73, pp. 728-739, (2014)

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