冻融环境下混凝土的损伤规律试验研究

Experimental Research on Damage Patterns of Concrete Under Freeze-thaw Conditions

摘要:

针对混凝土冻融损伤问题开展了相关冻融试验研究，分析损伤沿试件深度方向的变化特征以及尺寸效应对混凝土损伤的影响。结果表明：在冻融循环作用下，混凝土损伤发展呈现表层损伤严重、内部损伤较轻的不均匀损伤与混凝土整体均匀损伤并存的模式。其中，混凝土内部损伤沿深度方向差异显著，靠近核心区域损伤较小；试件尺寸对试件冻融损伤发展影响显著，在冻结最低温度相同和温度变化幅度近似的条件下，试件体积越大，冻融损伤越严重。

Abstract:

Related freeze-thaw experimental research is carried out on the freeze-thaw damage problem of concrete. The variation characteristics of damage along the depth direction of the specimen and the influence of size effect on the concrete damage are analyzed. The results show that under the action of freeze-thaw cycles, the development of concrete damage presents a pattern where uneven damage with severe surface damage and relatively minor internal damage coexists with uniform damage to the entire concrete, in which the internal damage of the concrete shows significant differences along the depth direction, but the damage near the core area is smaller. The size of the specimen has a significant influence on the development of freeze-thaw damage to the specimen. Under the conditions of the same minimum freezing temperature and similar temperature variation range, the larger the volume of the specimen, the more severe the freeze-thaw damage.