水泥中碱与聚羧酸减水剂相容性研究  

Study on the Compatibility of Alkali In Cement and Polycarboxylate Superplasticizer

作　　者：吴洲 黄小军[1,2] 郭飞 沙建芳 Wu Zhou;Huang Xiaojun;Guo Fei

机构地区：[1]高性能土木工程材料国家重点实验室,江苏南京210008 [2]江苏苏博特新材料股份有限公司,江苏南京210008

出　　处：《江苏建材》2023年第1期1-4,共4页Jiangsu Building Materials

基　　金：国家自然科学基金(51978318)。

摘　　要：碱在硅酸盐水泥中以K_(2)SO_(4)和Na_(2)SO_(4)的形式存在,影响水泥与聚羧酸盐减水剂(PCEs)的相容性。文章研究了K_(2)SO_(4)和Na_(2)SO_(4)对相容性的影响。结果表明,碱会降低PCEs在水泥颗粒上的吸附量,以及浆体初始流动度,但有利于随水化时间延长PCEs的吸附行为和流动性发展。与Na_(2)SO_(4)相比,K_(2)SO_(4)更有利于流动性、凝固时间以及相容性。从水泥与PCEs的相容性角度考虑,K_(2)SO_(4)和Na_(2)SO_(4)的适宜含量分别为0.6%~1.2%Na_(2)Oeq和小于0.6%。Alkali exists in the form of K_(2)SO_(4)and Na_(2)SO_(4)in Portland cement, which affects the compatibility of cement with polycarboxylate superplasticizers(PCEs). In the paper, the effects of K_(2)SO_(4)and Na_(2)SO_(4)on compatibility were investigated And results showed that alkali would reduce the adsorption capacity of PCEs on cement particles and the initial fluidity of the slurry. But it was beneficial to the development of the adsorption behaviour of PCEs and fluidity with the lapse of hydration time. Compared with Na_(2)SO_(4),K_(2)SO_(4)is more favourable for fluidity, setting time and compatibility. Considering the compatibility between cement and PCEs,the suitable contents of K_(2)SO_(4)and Na_(2)SO_(4)are 0.6%~1.2% Na_(2)Oeq and less than 0.6%, respectively.

关 键 词：碱 聚羧酸系减水剂 相容性 流动性 吸附量 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]