Coupling Effect of Saline Solution and Freezing-Thawing Cycles on Performance of Basalt Fiber Reinforced Cemented Soil

Abstract

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

CLC Number:

TU411.6

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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