活性掺合料对再生混凝土耐久性的影响  

Influence of Reactive Mineral Admixture on Durability of Recycled Concrete

作　　者：孙家瑛[1] 孙浩[2] 王培铭[2] 

机构地区：[1]上海市市政工程研究院,200031 [2]同济大学,上海200092

出　　处：《混凝土与水泥制品》2006年第1期1-4,共4页China Concrete and Cement Products

摘　　要：由于再生集料本身具有一些天然缺陷,导致再生集料配制的混凝土综合性能较同级配普通混凝土差。而掺入矿渣、粉煤灰等活性掺合料则可以改善普通混凝土的物理力学性能和耐久性能,因此,本课题在采用再生粗集料以不同比例取代天然集料的同时,用矿渣、粉煤灰等活性掺合料等量取代水泥,研究掺活性掺合料再生混凝土的力学性能和耐久性能。实验结果表明,随再生集料用量的增加,混凝土的物理力学性能和耐久性能有所下降,但掺加一定量的活性掺合料可以明显改善再生混凝土的耐久性能。采用合适掺量的矿渣,可以配制出坍落度为180mm、28d抗压强度达50MPa以上、各种耐久性能指标均达到基准混凝土技术指标的再生集料混凝土。It is studied to mechanical properties and durability of Recycled Aggregate Concrete with addition of different mineral admixtures for replacing the same content of cement, and at the same time the natural aggregate is replaced by recycled aggregate in different proportion. The results show that with increasing of contents of recycled aggregate the mechanical properties and durability of concrete are decreased in a little, but when addition of certain content of mineral admixture the durability of Recycled Concrete can be improved obviousely. And by using of appropriate content of slag, a recycled concrete with slump of 180mm, compressire strength of 50MPa at the 28d and the criterions for durability are all reached to the technical requirements for referential concrete can be produced.

关 键 词：再生集料 活性掺合料 力学性能 耐久性能 

分 类 号：TU528[建筑科学—建筑技术科学]