硫酸钙晶须混凝土冻融性能研究

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Abstract Research purposes: In northern China, concrete structures not only face freeze-thaw cycles but also suffer from abrasion caused by sediment and gravel during flood seasons, leading to significant durability degradation. Adding high-strength, high-modulus fibers can effectively improve durability. This study investigated the concrete used in a high-speed railway bridge in northern China. By incorporating calcium sulfate whisker (CSW), freeze-thaw and abrasion tests were conducted on C40 and C60 CSWC, and the effects on durability were analyzed.
Research conclusions: (1) Incorporating CSW significantly improved the freeze-thaw and mechanical properties of CSWC. (2) The optimal surface performance under freeze-thaw and abrasion occurred with 5 kg/m³ of CSW. (3) A plastic microstrain-based freeze-thaw damage model was established to predict frost resistance durability. (4) The research results can provide a theoretical basis for the improvement of concrete durability, and have guiding significance for the practical application of CSWC in cold regions of northern China.

Key words： calcium sulfate whisker concrete freeze-thaw cycle abrasion service life prediction

Received: 25 December 2023

PACS:

TU375

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	LIU Minghui
	JIA Siyi
	WANG Xiaoqing
	XU Zhou

Cite this article:

LIU Minghui,JIA Siyi,WANG Xiaoqing, et al. Study on Freeze-thaw Properties of Calcium Sulfate Whisker Concrete[J]. Journal of Railway Engineering Society, 2024, 41(11): 104-111.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I11/104

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