两性羧酸类接枝共聚物混凝土超塑化剂的性能研究  

Properties of Amphoteric Carboxylic Graft Copolymer as Concrete Superplasticizer

作　　者：张月星[1] 冉千平[1] 刘加平[1] 缪昌文[1] 

机构地区：[1]江苏省建筑科学研究院有限公司江苏苏博特新材料股份有限公司,江苏南京210008

出　　处：《化学建材》2006年第2期43-46,共4页Chemical Materials for Construction

基　　金：江苏省科研院所技术开发专项资金项目(BM2003516)

摘　　要：从羧酸类接枝共聚物外加剂吸附作用机理和两性聚电解质溶液理论着手,设计和合成了一种掺量低、饱和点高、减水率高、增强效果好的两性羧酸类接枝共聚物超塑化剂。当掺量为0.2%时,减水率达到30%;掺量为0.40%时,减水率高达40%;增大掺量,减水率可以进一步提高。混凝土强度增长比较稳定,而且该共聚物能够有效改善水泥硬化产物的孔结构和大大降低水化热和温度,有利于提高混凝土的耐久性。Based on dispersion and adsorption mechanism of carboxylate superplasticizer and polyampholyte solution theory, designed and synthesized was a kind of amphoteric carboxylic graft copolymer with low dosage, higher saturation point, higher water reduction, fine strength enhancing effects. Its water reduction could reach 30% at a dosage of 0.2%, be as high as 40% at a dosage of 0.40% and be even higher when dosage was further increased. Concrete strength development was stable and this copolymer could effectively improve pore structure in hydrated cement paste and also reduce rate of heat evolution and isothermal heat of hydration of cement paste.

关 键 词：两性 聚羧酸 超塑化剂 性能 孔结构 水化热 

分 类 号：TU528.042[建筑科学—建筑技术科学]