非饱和水工混凝土冻融劣化微观孔隙结构与宏观性能关系研究

doi:10.11896/cldb.24080219

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Abstract In this study, the relationship between microscopic pore structure and macroscopic mechanical properties of unsaturated hydraulic concrete under freeze-thaw deterioration was investigated. The sealed freeze-thaw test with three different saturations (85%~91.7%, 91.7%~95%, 95%~100%) and water-freeze-thaw test of hydraulic concrete were designed and carried out. The macroscopic degradation values of compressive and splitting strength of hydraulic concrete under three different freeze-thaw cycle temperatures (-18~6 ℃, -10~6 ℃, -5~6 ℃ ) were obtained. In addition, the corresponding microscopic pore structure parameters were detected based on the nitrogen adsorption method. Then the relationship between microscopic pore structure and macroscopic mechanical properties was analyzed by regression. Finally, a prediction model of freeze-thaw deterioration of unsaturated hydraulic concrete was established. The results show that the deterioration rule of macro and micro properties of sealed freeze-thaw group is similar to that of water-freeze-thaw group, but the deterioration amplitude of sealed freeze-thaw group is smaller than that of water-freeze-thaw group. The strength of unsaturated hydraulic concrete after freeze-thaw deterioration is negatively correlated with average pore size, total pore volume and total porosity, but positively correlated with fractal dimension. Based on the fractal dimension and harmless pore volume fraction of concrete mortar after freeze-thaw deterioration, the strength performance of unsaturated hydraulic concrete can be accurately predicted, the multiple correlation coefficients of the model were 0.978 and 0.951, respectively.

Key words： unsaturated hydraulic concrete freeze-thaw damage macro-micro performance prediction model

Published: 10 October 2025 Online: 2025-09-24

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TV41

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	Articles by authors
	HUANG Yaoying
	FANG Chen
	SHAO Chengyu
	LI Zepeng
	ZHU Zhaohui

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HUANG Yaoying,FANG Chen,SHAO Chengyu, et al. Study on the Relationship Between Microscopic Pore Structure and Macroscopic Properties of Unsaturated Hydraulic Concrete Under Freeze-Thaw Deterioration[J]. Materials Reports, 2025, 39(19): 24080219-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24080219 OR https://www.mater-rep.com/EN/Y2025/V39/I19/24080219

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