冻融循环作用下不同含气量混凝土抗冻性研究  

Frost resistance analysis of different air-content concrete based on freeze-thaw cycle test

作　　者：李伟民 王印[1] 冯晓阳 LI Weimin;WANG Yin;FENG Xiaoyang(College of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China;North China Construction Group Co., Ltd., Shijiazhuang 050000, China)

机构地区：[1]河北农业大学城乡建设学院,河北保定071001 [2]华北建设集团有限公司,河北石家庄050000

出　　处：《河北农业大学学报》2019年第3期131-135,共5页Journal of Hebei Agricultural University

基　　金：河北省教育厅重点项目(ZD2014073);河北农业大学理工基金项目(LG20140301)

摘　　要：冻融作用是影响混凝土耐久性的重要因素。本研究通过不同含气量混凝土的冻融循环试验,对冻融后混凝土的抗冻性能进行分析,采用质量损失与动弹性模量变化为抗冻指标对混凝土冻融循环结果进行评价。结果表明:引气剂的掺入可改善混凝土冻融循环条件下的抗冻性能。随冻融循环次数增加,混凝土的质量与动弹性模量均有所下降,掺有引气剂的混凝土下降幅度较小,质量与动弹性模量下降幅度随含气量增大而减小。通过研究引气剂对混凝土抗压强度的影响,发现含气量越高,混凝土抗压强度下降幅度越明显。从质量损失、动弹性模量变化与抗压强度三方面综合分析,得出使混凝土具有较好抗冻性能与较好力学性能的最佳含气量。Freezing and thawing are important factors affecting the durability of concrete. The frost resistance of concrete with different air contents was analyzed by freeze-thaw cycle test. The mass loss and change of dynamic elastic modulus were used as anti-freeze indices to evaluate the results of the freeze-thaw cycle of concrete. The results showed that incorporation of air entraining agent can improve the frost resistance of concrete under freeze-thaw cycles. The mass and dynamic elastic modulus of concrete decreased with the increase of freeze-thaw cycles, while the concrete with air entraining agent decreased slightly. The mass loss and dynamic elastic modulus decreased with the increase of concrete gas content. By studying the influence of air entraining agent on the compressive strength of concrete, it is found that the higher the concrete air content is, the more obvious the concrete compressive strength decreases. The optimum gas content of concrete with better frost resistance and better mechanical properties is obtained by comprehensive analysis from mass loss,dynamic elastic modulus and compressive strength.

关 键 词：冻融循环 质量损失 动弹性模量 抗压强度 最佳含气量 

分 类 号：TU502[建筑科学—建筑技术科学]