黄河砂高延性水泥基复合材料的冻融损伤特性与模型研究

doi:10.16552/j.cnki.issn1001-1625.2024.1213

摘要/Abstract

摘要： 为了研究黄河砂高延性水泥基复合材料(ECC)的抗冻耐久性能,开展快速冻融循环试验,研究分析不同黄河砂取代率下ECC材料的质量损失率、相对动弹性模量、立方体抗压强度及劈裂抗拉强度变化规律,基于黄河砂取代率的多维评估,得到了最优黄河砂取代率;借助扫描电子显微镜和X射线计算机断层成像试验,进一步分析了最优取代率下ECC材料的微观特征和抗冻机理。研究表明:经历150次冻融循环后,5组ECC试件的相对动弹性模量均不低于97%,且抗压强度和劈裂抗拉强度随着黄河砂取代率的增加而增大。多维评估分析结果表明,100%取代率下黄河砂ECC抗冻性能最佳。微观分析表明,黄河砂ECC孔隙分布均匀、小孔比例较高,内部水化程度较高,纤维黏结性良好。基于Weibull概率分布的冻融损伤模型可较好地预测黄河砂ECC的冻融损伤状态。

关键词: 黄河砂, 高延性水泥基复合材料, 取代率, 抗冻性能, 冻融模型

Abstract: To investigate the frost resistance and durability performance of high-ductility engineered cementitious composites (ECC) made with Yellow River sand, the rapid freeze-thaw cycle test was carried out to study the mass loss rate, relative dynamic elastic modulus, cube compressive strength and splitting tensile strength of ECC materials under different Yellow River sand replacement rate. Based on the multidimensional evaluation of the replacement rate of the Yellow River sand, the optimal replacement rate was obtained. The microscopic characteristics and frost resistance mechanism under the optimal replacement rate were further analyzed by means of scanning electron microscope and X-ray computed tomography tests. The results show that the relative dynamic elastic modulus of the five groups of ECC specimens is not less than 97% after 150 freeze-thaw cycles, and the compressive strength and splitting tensile strength increase with the increase of the replacement rate of Yellow River sand. The results of multidimensional evaluation analysis show that the frost resistance of Yellow River sand ECC is the best at 100% frost rate. Microscopic analysis shows that the pore distribution is uniform, the proportion of small pores is high, the degree of internal hydration is high, and the fiber adhesion is good. The freeze-thaw damage model based on Weibull probability distribution can better predict the freeze-thaw damage state of Yellow River sand ECC.

Key words: Yellow River sand, high-ductility engineered cementitious composite, replacement rate, frost resistance, freeze-thaw model

中图分类号:

TU528

范嘉慧, 张艺珂, 元成方. 黄河砂高延性水泥基复合材料的冻融损伤特性与模型研究[J]. 硅酸盐通报, 2025, 44(6): 2060-2069.

FAN Jiahui, ZHANG Yike, YUAN Chengfang. Freeze-Thaw Damage Characteristic and Modeling of Yellow River Sand High-Ductility Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2060-2069.

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