聚羧酸减水剂的温度依赖性

Temperature Dependence of Polycarboxylic Acid Superplasticizer

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.