硫酸钙晶须混凝土冻融性能研究

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摘要 研究目的：在我国北方寒冷地区,河流众多,混凝土结构不仅承受冻融循环的影响,还会在汛期遭受河流中泥砂和碎石的反复冲击与摩擦,导致耐久性显著劣化。为提高混凝土的耐久性,加入高强度、高弹性模量的纤维材料是一种有效的解决方案。本文以华北地区某高铁桥梁工程的桥用混凝土为研究对象,通过加入一定掺量的硫酸钙晶须,开展C40和C60硫酸钙晶须混凝土(calcium sulfate whisker concrete,CSWC)的冻融试验和冲磨试验,分析冻融循环作用和冲磨作用对CSWC耐久性的影响。
研究结论：（1）掺入CSW后,CSWC的冻融性能和力学性能均较普通混凝土有显著改善;（2）当CSW掺量为5 kg/m³时,冻融循环及冲磨耦合作用下的表面性能提升效果最佳;（3）建立了基于塑性微应变的CSWC冻融损伤发展模型,并据此预测了其抗冻耐久性寿命;（4）本研究结果可为混凝土耐久性提升提供理论依据,并对CSWC在我国北方寒冷地区的实际应用具有指导意义。

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	刘明辉
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关键词 ：硫酸钙晶须混凝土, 冻融循环, 冲磨, 寿命预测

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

收稿日期: 2023-12-25

PACS:

TU375

作者简介: ** 刘明辉,1979年出生,男,副教授。

引用本文:

刘明辉, 贾思毅, 汪小庆, 徐舟. 硫酸钙晶须混凝土冻融性能研究[J]. 铁道工程学报, 2024, 41(11): 104-111.
LIU Minghui, JIA Siyi, WANG Xiaoqing, XU Zhou. Study on Freeze-thaw Properties of Calcium Sulfate Whisker Concrete. Journal of Railway Engineering Society, 2024, 41(11): 104-111.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2024/V41/I11/104

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