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碱金属硫酸盐与减水剂对水泥浆体抗泌水能力的影响
作者:韩松1 阎培渝2 安明喆1 
单位:1. 北京交通大学建筑工程系 北京 100044 2. 清华大学土木工程系 土木工程安全与耐久教育部重点实验室 北京 100084 
关键词:减水剂 泌水 自由溶液量 zeta电位 碱金属硫酸盐 
分类号:TU528.042.2
出版年,卷(期):页码:2016,44(11):0-0
DOI:10.14062/j.issn.0454-5648.2016.11.11
摘要:

通过测量水泥浆体的zeta电位,研究了碱金属硫酸盐对掺有萘系或聚羧酸减水剂的水泥浆体内自由溶液量的影响规律,以及碱金属硫酸盐和减水剂掺量对水泥浆体的保水能力和水泥颗粒之间作用力的影响,并讨论了浆体抗泌水能力变化的机理。结果表明:萘系减水剂和聚羧酸减水剂的加入都会降低浆体的自由溶液量,增加浆体保水能力;但在超过饱和掺量后,萘系减水剂会引起浆体内部吸附水量降低,对浆体产生不利影响,聚羧酸减水剂则没有类似作用。当水泥浆体中掺入碱金属硫酸盐时,聚羧酸减水剂受到的影响要显著小于萘系减水剂。在掺有减水剂的水泥浆体中,掺入适量的碱金属硫酸盐可以提高浆体的保水能力,降低泌水风险。萘系减水剂对应的碱金属硫酸盐最佳掺量约为2.7% SO3当量,聚羧酸减水剂则为2.5% SO3当量。碱金属硫酸盐通过快速溶出硫酸根离子,影响水泥颗粒表面动电特性,进而影响浆体的抗泌水能力;溶解速率较慢的二水石膏没有类似作用。
 

The zeta potential of the cement pastes was determined to investigate the influence of alkali sulfate on the free solution amount of cement paste with naphthalene (NS) or polycarboxylate (PCE) as superplasticizers. The water-holding capacity of cement paste and force between the cement particles were analyzed. The corresponding mechanism with respect to alkali sulfate and superplasticizer effects on the bleeding resistance of cement paste was discussed. The results show that free solution amount decreases and water-holding capacity improves after adding NS and PCE. However, the overdose NS reduces the amount of adsorbed solution in paste, which adversely affects the cement paste on the water-holding capacity, but PCE does not have such an effect. The effect of alkali sulfate on PCE is less than that on NS. In cement paste with superplasticizer, the appropriate amount of alkali sulfate improves the water-holding capacity of cement paste and reduces the risk of bleeding. The optimal content of sulfate is approximately 2.7% SO3 for NS and 2.5% SO3 for PCE. Alkali sulfate affects the zeta potential of cement particle surface via the rapid dissolution of sulfate ion, thereby increasing the bleeding resistance of cement paste. Gypsum has no effect, thus causing the slower dissolution.
 

基金项目:
中央高校基本科研业务费专项资金(2016JBM045);国家自然科学基金(51408037,51578049)资助项目。
作者简介:
韩 松(1984—),男,讲师。
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