西藏水工混凝土抗冻性能的研究(续)

地处高寒地区的西藏，尽夜温差较大，水利水电工程中混凝土的冻融破坏非常严重。为研究解决这一工程问题，采用正交试验设计方法，就当地混凝土材料和引气剂设计了几种水利水电工程常用的不同强度等级混凝土。通过快速冻融试验，测试了冻融对混凝土的抗压强度、抗折强度及动弹性模量的影响，并通过显微测孔分析了混凝土的微现结构。最后，就不同因素对混凝土强度和抗冻性能的影响进行了评价，并提出了几种抗冻混凝土的推荐配合比。

Study of freezing resistance of hydraulic concrete in Tibet

Due to the temperature differential is larger in Tibet, the damage of hydraulic concrete suffer from freezing thawing is very serious. In order to solve this problem, different strength grades of concrete which are in common used in hydraulic engineering are prepared by use of local materials and air entraining admixture, and the cross experiment method is adopted. Compressive strength, fracture strength and modulus of elasticity of the concrete are tested around certain freezing thawing cycles. The micro structure of the concrete is also analyzed by means of microscope. Finally, the factors that affecting strength of the concrete are discussed and the mixture ratio of freezing thawing resistance concrete is proposed.