聚羧酸减水剂的温度依赖性  

Temperature Dependence of Polycarboxylic Acid Superplasticizer

作　　者：吴华明[1,2] 薛永宏[1,2] 林宗良[1,2] 周栋梁[1,2] 

机构地区：[1]江苏省建筑科学研究院高性能土木工程材料国家重点实验室,南京210008 [2]江苏博特新材料有限公司,南京210008

出　　处：《混凝土与水泥制品》2011年第10期9-12,共4页China Concrete and Cement Products

摘　　要：在三个温度(5℃、20℃、30℃)条件下,采用净浆流动度和总有机碳分析仪测量有机碳的方法评价了两种具有不同接枝方式的聚羧酸减水剂(P-酯减水剂和P-醚减水剂)在水泥体系中的分散性能和吸附性能,并系统讨论了吸附量与分散性能之间的关系。试验结果表明:P-酯减水剂的初始分散性能受温度的影响较大,P-醚减水剂的持续分散能力与温度有较大的依赖性;P-醚减水剂的吸附总量小于P-酯减水剂,但具有更好的吸附稳定性;在吸附量对分散能力的贡献率方面,P-醚减水剂具有更大的优势。Under the different temperature conditions（5℃,20℃,30℃）, the dispersion ability and adsorption property of two kinds of polycarboxylic acid superplastieizer with different grafting modes （P-ester and P-ether superplasticizers） are evaluated by cement paste fluidity and measuring organic carbon by total organic carbon analyzer. The relationship between adsorption amount and dispersion ability is systematically discussed. The experimental results show that the original dispersion ability of P-ester superplasticizer is affected larger by temperature, and the sustainable dispersion ability of P-ether superplasticizer has higher dependence with the temperature. The total adsorption amount of P-ether superplasticizer is smaller than that of P-ester superplasticizer, but P-ether superplasticizer has better adsorption stability. P-ether super-plasticizer has better contribution on the effect of adsorption amount on the dispersion ability.

关 键 词：聚羧酸减水剂 分散性能 吸附性能 温度依赖性 

分 类 号：TU528[建筑科学—建筑技术科学]