粉煤灰陶粒混凝土的抗盐冻性能

Salt scaling resistance of fly ash ceramics concrete

为了评价桥面铺装中应用的轻骨料混凝土长期耐久性,利用R ILEM推荐混凝土抗盐冻性能试验标准(CDF)研究了粉煤灰陶粒混凝土与普通混凝土的抗盐冻性能.结果表明:相同强度等级的掺加矿物掺合料的粉煤灰陶粒混凝土的抗盐冻性能明显优于普通混凝土的抗盐冻性能.复掺矿物掺合料混凝土的抗盐冻性能优于单掺矿物掺合料混凝土的抗盐冻性能.与普通混凝土相比,通过SEM-EDXA的分析,掺与未掺矿物掺合料陶粒与水泥石之间的界面过渡区的范围明显变小,这是粉煤灰陶粒混凝土抗除冰盐性能优良的重要原因.

In order to evaluate the durability of lightweight aggregate concrete applied in the bridge deck in cold area, the RILEM recommended test method （CDF） about frost resistance of concrete was adopted to do a comparative study on frost resistance of fly ash ceramics concrete and that of ordinary concrete. The results indicate that the salt scaling resistance of fly ash ceramics concrete incorporating mineral admixture is better than that of ordinary concrete at the same strength grade. The salt scaling resistance of concrete with multiple-doped mineral admixture is much better than that of concrete with single-doped mineral admixture. The SEM-EDXA analysis indicates that the fly ash ceramics concrete has better performance of salt scaling resistance due to the smaller interface transition zone within fly ash ceramics and hardened cement paste with or without mineral admixture compared with the ordinary concrete.