盐水与冻融耦合作用对玄武岩纤维水泥土性能影响研究

摘要/Abstract

摘要： 冻融循环作用与外界环境的侵蚀是影响水泥土强度的主要因素,探索如何提高水泥土在寒冷地区盐水侵蚀环境下的强度及其发展规律是一个重要的课题。通过盐冻试验和无侧限抗压强度试验,研究了玄武岩纤维水泥土在不同溶液(3.5%(质量分数,下同)NaCl溶液、3.5%Na₂SO₄溶液、3.5%(NaCl+Na₂SO₄)混合溶液、清水)与冻融循环作用耦合下的力学性质与表观特征,探讨了养护温度、侵蚀溶液类型、冻融循环次数等变量对水泥土性能的影响。在此基础上,采用Logistic生长模型,对不同环境下水泥土试块的强度进行回归分析。研究结果表明:低温养护环境会抑制水泥土强度的发展;随着冻融次数的增加,试块出现了不同程度的质量损失、表面破坏,以及无侧限抗压强度降低的现象;在相同冻融次数下,玄武岩纤维水泥土的破坏程度由强到弱依次为硫酸盐冻＞混合盐冻＞氯盐冻＞水冻;而掺入玄武岩纤维可使水泥土经历更多次的冻融循环,有效降低强度损失率,提高水泥土的抗冻性;通过回归分析,得到不同试验组的强度衰减模型和预期强度。

关键词: 玄武岩纤维水泥土, 侵蚀环境, 盐冻, 冻融循环, 低温养护条件, 无侧限抗压强度

Abstract: The effects of freezing-thawing cycles and erosion of external environment are the main factors affecting the strength of cemented soil. It is an important subject to explore how to improve the strength characteristics and development law of cemented soil under saline erosion environment in cold areas. Based on salt frozen and unconfined compressive strength test, the mechanical properties and apparent characteristics of basalt fiber reinforced cemented soil under the coupling of different solutions (3.5% (mass fraction, the same below) NaCl solution, 3.5%Na₂SO₄ solution, and mixed solution of 3.5% (NaCl+Na₂SO₄), freshwater solution) and freezing-thawing cycles were studied. The effects of the curing temperature, erosion solution type, and freezing-thawing cycle on the mechanical properties of the cemented soil were discussed. On this basis, the Logistic growth model was used to carry out a regression analysis on the strength of the cemented soil samples in different environments. The results show that the low-temperature curing environment inhibits the strength development of the cemented soil. As the number of freezing-thawing cycles increasing, the samples have different degrees of quality loss, surface damage and unconfined compressive strength decreases. With the same freezing-thawing cycles, the damage degree of basalt fiber reinforced cemented soil from strong to weak is sulfate frozen > mixed salt frozen > chloride salt frozen > water frozen. The addition of basalt fiber makes the cemented soil undergo more freezing-thawing cycles, effectively reduces the strength loss rate, and improves the frost resistance of the cemented soil. The regression analysis is used to obtain the intensity attenuation models and the expected strength of different test groups.

Key words: basalt fiber reinforced cemented soil, erosive environment, salt frozen, freezing-thawing cycle, low-temperature curing condition, unconfined compressive strength

中图分类号:

TU411.6

徐丽娜, 张润泽, 牛雷, 宋道涵, 金玉杰. 盐水与冻融耦合作用对玄武岩纤维水泥土性能影响研究[J]. 硅酸盐通报, 2021, 40(11): 3572-3583.

XU Lina, ZHANG Runze, NIU Lei, SONG Daohan, JIN Yujie. Coupling Effect of Saline Solution and Freezing-Thawing Cycles on Performance of Basalt Fiber Reinforced Cemented Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3572-3583.

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