冻融循环条件下混凝土的拉伸强度与断裂韧度研究

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发布时间：2020-01-06 00:00:00

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冻融循环条件下混凝土的拉伸强度与断裂韧度研究

Study on the Influence of Freeze-thaw Cycles on the Tensile Strength and Fracture Toughness of Concrete

2022年第10期

三点弯曲试验；冻融循环；断裂韧度；拉伸强度；极限荷载

Three-point bending test; Freeze-thaw cycle; Fracture toughness; Tensile strength; Maximum fracture load

2022年第10期

10.19761/j.1000-4637.2022.10.017.05

国家自然科学基金项目（51778591）。

孟令彤，杨树桐，杨松

中国海洋大学工程学院，山东青岛 266100

孟令彤，杨树桐，杨松

孟令彤,杨树桐,杨松.冻融循环条件下混凝土的拉伸强度与断裂韧度研究[J].混凝土与水泥制品,2022(10):17-21.

MENG L T,YANG S T,YANG S.Study on the Influence of Freeze-thaw Cycles on the Tensile Strength and Fracture Toughness of Concrete[J].China Concrete and Cement Products,2022(10):17-21.

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摘要：利用预制不同初始缝长的小尺寸混凝土梁试件，进行了冻融循环试验，并通过三点弯曲试验研究了冻融作用后混凝土的断裂性能。基于边界效应模型，引入反映材料非连续性与非均匀性的系数，利用试件的极限荷载，确定了不同冻融循环次数下混凝土的拉伸强度与断裂韧度。结果表明：随着冻融循环次数的增加，混凝土的拉伸强度与断裂韧度明显降低；相对于未经冻融循环的试件，当经75次冻融循环时，混凝土拉伸强度与断裂韧度的降低超过了38%；基于边界效应模型得到的拉伸强度考虑了材料的非连续性和非均匀性，使计算结果明显高于混凝土的劈裂抗拉强度，可较准确地反映冻融作用后混凝土的劣化损伤程度。 Abstract: The fracture behavior of concrete beam specimens with different initial notch lengths after freeze-thaw was studied by using three-point bending test. Based on the boundary effect model, the coefficients reflecting the material discontinuity and inhomogeneity were introduced, and the maximum fracture load of the specimens was used to determine the real tensile strength and fracture toughness of concrete under different freeze-thaw cycles times. The results show that as the number of freeze-thaw cycles increases, the tensile strength and fracture toughness of concrete are obviously reduced. Compared with the specimens without freeze-thaw cycles, the tensile strength and fracture toughness of concrete are reduced by more than 38% when the number of freeze-thaw cycles reached 75 times. The tensile strength obtained based on the boundary effect model is significantly higher than the splitting tensile strength of concrete due to the incorporation of the discontinuity and non-uniformity of materials, and can more accurately reflect the deterioration and damage degree of concrete after freeze-thaw action.

英文名 : Study on the Influence of Freeze-thaw Cycles on the Tensile Strength and Fracture Toughness of Concrete

刊期 : 2022年第10期

关键词 : 三点弯曲试验；冻融循环；断裂韧度；拉伸强度；极限荷载

Key words : Three-point bending test; Freeze-thaw cycle; Fracture toughness; Tensile strength; Maximum fracture load

刊期 : 2022年第10期

DOI : 10.19761/j.1000-4637.2022.10.017.05

文章编号 :

基金项目 : 国家自然科学基金项目（51778591）。

作者 : 孟令彤，杨树桐，杨松

单位 : 中国海洋大学工程学院，山东青岛 266100

孟令彤，杨树桐，杨松

孟令彤,杨树桐,杨松.冻融循环条件下混凝土的拉伸强度与断裂韧度研究[J].混凝土与水泥制品,2022(10):17-21.

MENG L T,YANG S T,YANG S.Study on the Influence of Freeze-thaw Cycles on the Tensile Strength and Fracture Toughness of Concrete[J].China Concrete and Cement Products,2022(10):17-21.

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摘要

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结论

参考文献

引用本文

Abstract: The fracture behavior of concrete beam specimens with different initial notch lengths after freeze-thaw was studied by using three-point bending test. Based on the boundary effect model, the coefficients reflecting the material discontinuity and inhomogeneity were introduced, and the maximum fracture load of the specimens was used to determine the real tensile strength and fracture toughness of concrete under different freeze-thaw cycles times. The results show that as the number of freeze-thaw cycles increases, the tensile strength and fracture toughness of concrete are obviously reduced. Compared with the specimens without freeze-thaw cycles, the tensile strength and fracture toughness of concrete are reduced by more than 38% when the number of freeze-thaw cycles reached 75 times. The tensile strength obtained based on the boundary effect model is significantly higher than the splitting tensile strength of concrete due to the incorporation of the discontinuity and non-uniformity of materials, and can more accurately reflect the deterioration and damage degree of concrete after freeze-thaw action.

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冻融循环条件下混凝土的拉伸强度与断裂韧度研究

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