粉煤灰陶粒混凝土的抗盐冻性能_杨英姿.pdf

17 2 Vol17 No2 2 0 0 9 4 MATERIALS SCIENCE TECHNOLOGY Apr. , 2009 杨英姿, 邓宏卫, 高小建, 张爱莲 ( , 150001, E- ail: yzyang@ hit. edu. cn) : 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 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. : 粉煤灰陶粒;混凝土;抗盐冻性能 : TU528 : A : 1005- 0299(2009) 02- 0239- 04 Salt scaling resistance of fly ash ceram ics con crete YANG Ying-z,i DENG Hong-wei, GAO Xiao-jian, ZHANG A-i lian ( SchoolofCivilEngineering, H arbin Institute ofTechnology, Harbin 150001, China, E- ail: yzyang@ hit. edu. cn) Abs tract: In order to evaluate the durability of lightweight aggregate concrete applied in the bridge deck in cold area, theRILEM reco ended test ethod (CDF) about frost resistanceofconcretewas adopted to do a co parative study on frost resistance of fly ash cera ics concrete and that of ordinary concrete. The results in- dicate that the salt scaling resistanceof fly ash cera ics concrete incorporating ineralad ixture isbetter than that of ordinary concrete at thesa e strength grade. The salt scaling resistance ofconcretew ith ultiple-doped ineralad ixture is uch better than thatof concretew ith single-doped ineral ad ixture. TheSEM-EDXA analysis indicates that the fly ash cera ics concretehas better perfor anceof salt scaling resistance due to the s aller interface transition zonew ithin fly ash cera ics and hardened ce ent pastew ith orw ithout ineralad- ixture co paredw ith the ordinary concrete. K ey w ord s: fly ash cera ics; concrete; salt scaling resistance