不同环境下普通混凝土抗冻试验研究及机理分析  

Experimental study and mechanism analysis on frost resistance of normal performance concrete under different environments

作　　者：徐小巍[1] 金伟良[1] 赵羽习[1] 段安[1] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058

出　　处：《混凝土》2010年第2期21-24,28,共5页Concrete

基　　金：国家自然科学基金重点项目(50538070);国家自然科学基金对外交流与合作项目(50811130215)

摘　　要：试验测试了不同水灰比普通混凝土在标准水冻环境、浓度5%的氯化钠溶液环境以及-10℃冻融循环3种不同环境下的抗冻性能。以试件的动弹性模量与质量损失作为抗冻性能的评判标准,试验结果表明:降温幅度对混凝土的抗冻性有显著影响,降温幅度越大,水灰比对试件抗冻性影响也越显著;-10℃冻融循环下,试件的质量损失不明显;在盐冻环境中,普通混凝土的动弹性模量与质量损失严重,试件迅速破坏。The effects of minimum temperature and salt solution on frost resistance property of normal performance concrete（NPC）with different water cement ratio are analyzed through the measuring of mass loss and dynamic elastic modulus loss of the specimen.Three different environments are considered in the freezing-thawing test,the standard pure water environment,the 5% sodium chloride solution environment and the -10 ℃ freez- ing environment.The results show that the temperature amplitude has a significant effect on the anti-frost property.The damage increases as the temperature goes down,and in the meantime the water cement ratio has a greater influence on the performance of specimen.During the -10 ℃ freezing environment,there is scarcely scaling phenomenon,but in the 5% sodium chloride solution environment,both the dynamic elastic modu- lus and mass of the specimen decrease rapidly.

关 键 词：冻结最低温度 动弹性模量 质量损失 水灰比 结晶压力 破坏机理 

分 类 号：TU528.01[建筑科学—建筑技术科学]