Study on the influence of fractal dimension and size effect of coarse aggregate on the frost resistance of hydraulic concrete

被引:4
作者
Zhou, Shihua [1 ]
Wu, Cai [2 ]
Li, Jiazheng [1 ]
Shi, Yan [1 ]
Luo, Mingxing [2 ]
Guo, Kai [3 ]
机构
[1] Changjiang Water Resources Commiss, Changjiang River Sci Res Inst, Wuhan 430010, Peoples R China
[2] Hubei Engn Univ, Sch Civil Engn, Xiaogan 432000, Peoples R China
[3] Wuhan Municipal Engn Design & Res Inst Co Ltd, Wuhan 430023, Peoples R China
基金
中国国家自然科学基金;
关键词
Concrete durability; Aggregate size; Fractal dimension; Hydraulic; Frost resistance;
D O I
10.1016/j.conbuildmat.2024.136526
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
In cold regions, hydraulic concrete structures are exposed to harsh environmental conditions that greatly impact their durability and safety. The role of aggregates in influencing concrete performance is paramount. This study aims to investigate how the fractal distribution and size of aggregates affect the frost resistance of hydraulic concrete, with air void characteristics, mass loss rate, Elastic Modulus of dynamic, and strength serving as primary references. Two experiment series, fractal distribution influence and aggregate size influence of concrete frost resistance, were conducted to analyze the frost resistance of hydraulic concrete with different aggregates. Based on the fractal theory, four grading fractal distributions were utilized to fractalize aggregate gradation, aiming to investigate the influence of aggregate fractal dimension on the frost resistance of hydraulic concrete. Simultaneously, concrete specimens of fully graded aggregate and wet-screened aggregate were also constructed to simultaneous freeze-thaw cycle tests, the impact of aggregate size on concrete's frost resistance performance was also studied by analyzing the air void structure in the frost-resistant concrete specimens. Results indicate that the specimens exhibit varying frost resistance performance under different aggregate gradation fractals, ranking from strongest to weakest as follows: D=2.5, D=2.3, D=2.1, D=2.7, which is attributed to the differences of air void spacing factors. Increasing aggregate size leads to greater internal structural heterogeneity in concrete, resulting in an increase in defects and weak points. This causes microcracks to develop more rapidly in the transition zone of fully graded concrete during freeze-thaw cycles, leading to more severe damage. The findings of this study can serve as a fundamental scientific basis for the designing and constructing of hydraulic concrete structures in cold areas.
引用
收藏
页数:16
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