摘要
针对西北地区混凝土结构遭受硫酸盐侵蚀和冻融循环双重破坏的问题,采用相对动弹性模量、质量损失率、抗压抗蚀系数为主要评价指标,研究分析水胶比对混凝土耐久性能的影响。同时,采用微观扫描电镜(SEM)对混凝土侵蚀破坏机理进行分析。研究结果表明,水胶比由0.4下降到0.3时,混凝土抗压抗蚀系数明显提高、质量损失率明显降低,降低水胶比可以有效提高混凝土结构的耐久性能;混凝土破坏主要表现为表面剥蚀破坏,剥蚀层有侵蚀产物石膏生成。
For the problem of the concrete structure damaged by sulfate erosion and freeze-thaw cycle in the northwest alpine and salinealkaline area, the study researched and analysed the influence of water-binder ratio on concrete durability. It took the relative dynamic elastic modulus, mass loss, coefficient of compressive strength as the main evaluation index. At the same time, microstructure of concrete was analyzed analysis using scanning electron microscope(SEM). The results showed that, when water/cement ratio dropped from 0.4 to 0.3, the concrete compressive resistance coefficient increased obviously and loss rate significantly reduced quality, and reducing the waterbinder ratio could improve the compactness of concrete effectively. Concrete destruction mainly for surface erosion damage and dihydrate gypsum, the product of sulfate attack was found in denudation layer.
出处
《商品混凝土》
2016年第10期29-32,共4页
Ready-Mixed Concrete
关键词
冻融循环
硫酸盐侵蚀
水胶比
混凝土
freeze-thaw cycle
sulfate erosion
water/cement raito
concrete
