氯盐冻融耦合环境下特细砂混凝土性能研究
Study on the Performance of Ultra Fine Sand Concrete under Chloride Freeze Thaw Coupled Environment
DOI: 10.12677/hjce.2025.1411291, PDF,    科研立项经费支持
作者: 包 宁：宁夏农垦建设有限公司，宁夏 银川；车佳玲, 马志鹏, 刘统伟：宁夏大学土木与水利工程学院，宁夏 银川
关键词: 特细砂混凝土；氯盐浓度；盐冻循环；损伤模型；Ultra Fine Sand Concrete； Chloride Concentration； Salt Freezing Cycle； Damage Model
摘要: 针对特细砂混凝土在高寒、高盐地区应用的关键问题——其独特的超细颗粒特性可能导致迥异于常规混凝土的盐冻损伤机制与演化规律，本研究采用单面冻融试验方法，探究了特细砂掺量与氯盐浓度等因素对特细砂混凝土抗冻性能的影响。结果表明：特细砂混凝土的工作性能和抗压强度随着特细砂掺量的增加逐渐降低。经历60次冻融循环后，特细砂混凝土的抗压强度随着特细砂掺量的增加呈现先降低后增加再降低的变化趋势，掺入30%的特细砂可提高混凝土抗冻性。三种侵蚀溶液对特细砂混凝土侵蚀性的大小表现为3% NaCl > 清水 > 10% NaCl。建立了指数函数盐冻损伤模型，且模型的计算值与试验值吻合较好，相关性系数(R2)均在0.93以上。研究结果为特细砂混凝土在盐冻耦合地区的应用提供了理论支撑与试验依据。
Abstract: In response to the durability issue of ultra fine sand concrete in high-altitude and high salt areas, a single-sided freeze-thaw test method was used to study the effects of ultra fine sand content (0%, 20%, 30%, 40%), chloride concentration (0%, 3%, 10%) and other factors on the frost resistance of ultra fine sand concrete. The results show that the workability and compressive strength of ultra fine sand concrete gradually decrease with the increase of ultra fine sand content. After 60 freeze-thaw cycles, the compressive strength of ultra fine sand concrete shows a trend of first decreasing, then increasing, and then decreasing with the increase of ultra fine sand content. Adding 30% ultra fine sand can improve the frost resistance of concrete. The corrosiveness of three types of erosion solutions on ultra fine sand concrete is shown as 3% NaCl > clear water > 10% NaCl. An exponential function salt freezing damage model was established, and the calculated values of the model were in good agreement with the experimental values, with correlation coefficients (R2) above 0.93. The research results provide theoretical support and experimental basis for the application of ultra-fine sand concrete in salt frost coupling areas.
文章引用：包宁, 车佳玲, 马志鹏, 刘统伟. 氯盐冻融耦合环境下特细砂混凝土性能研究[J]. 土木工程, 2025, 14(11): 2722-2730. https://doi.org/10.12677/hjce.2025.1411291

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