Effect of superabsorbent polymers and expansive additives on the shrinkage of alkali-activated slag

收缩率 高吸水性高分子 灰浆 膨胀的 抗压强度 石膏 材料科学 水泥 膨胀性粘土 复合材料 吸水率 熔渣(焊接) 化学 聚合物 环境科学 土壤科学 土壤水分
作者
Jingbin Yang,Didier Snoeck,Nele De Belie,Zhenping Sun
出处
期刊:Cement & Concrete Composites [Elsevier BV]
卷期号:123: 104218-104218 被引量:46
标识
DOI:10.1016/j.cemconcomp.2021.104218
摘要

In this study, superabsorbent polymers (SAPs) and two expansive additives (a MgO-based expansion agent and gypsum) were studied to possibly mitigate the shrinkage of AAS (alkali-activated slag) systems. To this end, an experimental study was carried out to evaluate the effect of SAPs and the expansive additives on the setting time, compressive strength, autogenous shrinkage, and total shrinkage of AAS. SAPs prolonged the setting time of AAS and decreased the compressive strength, while the expansive additives shortened the setting time of AAS. When gypsum was used as an expansive additive, the shortest initial setting time of AAS was less than 10 min. SAPs have a significant effect in reducing the autogenous shrinkage of AAS, and a better result was achieved when used together with the MgO-based expansion agent as the SAPs promoted the consumption of MgO. The 1H low-field NMR results showed that when the SAPs and gypsum were used together, the absorption capacity of the SAPs decreased, and part of the absorbed liquid was rapidly released back into the mortar matrix. However, for the total shrinkage, the SAPs were less effective. SAPs increased the mass loss of the AAS mortar upon drying, which may increase the drying shrinkage of AAS and counteract part of the reduction in autogenous shrinkage.
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