含引气剂海工混凝土的抗冻性能及其梁受弯承载力

摘要/Abstract

摘要： 为了研究引气剂对海工混凝土抗冻性能及其梁受弯承载力的影响,对2种配合比6根海工混凝土梁及相应的冻损试件进行总计100次快速冻融试验;采用质量损失率、动弹性模量损伤度和抗压强度损失率对混凝土冻融损伤程度进行有效评价;考虑混凝土抗压强度退化以及等效矩形应力图系数的变化,提出了冻融作用下海工混凝土梁正截面受弯承载力计算公式。结果表明:加入引气剂可以增强海工混凝土的抗冻性能,降低梁的开裂弯矩退化速率,但会降低混凝土强度和梁的极限弯矩;在150次冻融循环内,提出的模型能够较好地预测冻融作用下海工混凝土梁的正截面受弯承载力。

关键词: 海工混凝土, 冻融作用, 引气剂, 抗冻性能, 受弯承载力, 开裂弯矩

Abstract: In order to study the effect of air-entraining agent on the frost resistance of marine concrete and its beam bending capacity, a total of 100 rapid freeze-thaw tests were carried out on six marine concrete beams of two mix ratios and the corresponding freeze-damaged test blocks. The mass loss rate, the dynamic elastic modulus damage degree and the compressive strength loss rate were used to efficiently evaluate the degree of freeze-thaw damage of concrete. The degradation of the compressive strength of concrete as well as the changes in the coefficients of the equivalent rectangular stress diagrams were considered, and the formula for calculating the bending capacity of normal cross-section of marine concrete beams under freeze-thaw action was proposed. The results show that the addition of air-entraining agent can enhance the frost resistance of marine concrete and slow down the degradation rate of the cracking moment of beams, but the concrete strength and the ultimate moment of beams will be reduced. The proposed model can predict the bending capacity of the cross-section of marine concrete beams under freeze-thaw action better within 150 freeze-thaw cycles.

Key words: marine concrete, freeze-thaw action, air-entraining agent, frost resistance, bending capacity, cracking moment

中图分类号:

TU375.1

陆春华, 朱学武, 平安, 杨钰婷. 含引气剂海工混凝土的抗冻性能及其梁受弯承载力[J]. 硅酸盐通报, 2024, 43(2): 418-427.

LU Chunhua, ZHU Xuewu, PING An, YANG Yuting. Frost Resistance of Marine Concrete Containing Air-Entraining Agent and Its Beam Bending Capacity[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 418-427.

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