基于SEM分析的粒化高炉矿渣混凝土冻融性能研究

Research on the Freeze-thaw Performance of Granulated Blast-furnace Slag Concrete Based on the SEM Analysis

为了研究粒化高炉矿渣混凝土的冻融性能,在快冻法的基础上,本文通过力学性能试验及扫描电镜分析研究了不同水胶比、不同代砂率的粒化高炉矿渣混凝土的力学性能退化机理,此外,分析了粒化高炉矿渣混凝土力学性能退化和微观结构的内在联系。试验结果表明:经过冻融循环后,粒化高炉矿渣混凝土的抗压强度损失率小于普通混凝土,且粒化高炉矿渣混凝土冻融后产生较多的相互交错的纤维状及花簇状晶体,这些晶体的产生可提高混凝土的抗压强度,所有结果表明粒化高炉矿渣可以提高混凝土的抗冻性,且代砂率越大抗冻性越好。

In this paper,the freeze-thaw performance of the granulated blast-furnace slag( GBS) concrete was studied.According to the test method for rapid freezing and thawing,degradation of mechanical properties about GBS concrete with2 kinds W/B ratio and 3 kinds GBS replacement ratio were tested,and micromorphology of GBS concrete were analyzed by scanning electron microscopy( SEM). Furthermore,relations between degradation of mechanical properties and micromorphology about GBS concrete were discussed. Results shows that: after freeze-thaw cycles,the compressive strength loss rate of GBS concrete is less than ordinary concrete,and analysis results of SEM,the GBS concrete produce more mutual interlacing fibrous and flowers from crystal,the growth of these crystals can improve the compressive strength of concrete. All results show that GBS can improve the frost resistance of concrete,the larger the GBS replacement ratio,the better the frost resistance.