Study on the durability of concrete in the northwest alpine and saline-alkaline area
Jin Ziqiang;Zhu Yanning;Liu Xiangnan;Ai Hongxiang;China West Construction Group Company;
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.
【CateGory Index】： TU528