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额外引水条件及高吸水性树脂掺加方式对砂浆收缩和孔结构的影响 预览

Effects of extra water and adding modes of super-absorbent polymer on shrinkage and pore structure of mortar
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摘要 为研究额外引水条件与高吸水性树脂(super-absorbent polymer,SAP)掺加方式对砂浆收缩和孔结构的影响,分别在总水胶比固定和稠度固定的条件下开展砂浆性能试验.以SAP吸水试验和砂浆稠度测试为基础,探讨干粉SAP和预饱水SAP在水泥基材料中吸液性能的差异,然后通过体积稳定性试验、压汞试验和扫描电镜观察,评价不同额外引水条件和SAP掺加方式对砂浆自收缩、干燥收缩和孔结构参数影响的差异.结果表明:在砂浆基体中,以干粉形式直接掺加的SAP比经过预吸水处理的SAP吸液性能强30%~50%;SAP能有效降低砂浆的自收缩,且SAP以干粉形式直接掺加时对自收缩的抑制作用更显著;额外引水可略微降低早期的干燥收缩,但是易引起砂浆后期干燥收缩变大;掺加SAP能细化砂浆孔结构,降低50~1 000 nm之间的大毛细孔数量,增加小于50 nm的小毛细孔数量,且在同掺量条件下干粉SAP的细化作用更显著. To investigate the effects of extra water and adding modes of super-absorbent polymer(SAP)on mortar shrinkage and pore structure,mortar performance tests were carried out under the conditions of fixed total water-to-binder ratio and fixed consistency.Based on water absorption test and mortar consistency test,the difference of the absorption performance between the dry powder SAP and the pre-saturated SAP in cement-based materials was discussed.The effects of extra water and SAP adding modes on the autogenous shrinkage,dry shrinkage and pore structure parameters of the mortar were evaluated by volume stability test,mercury intrusion test and scanning electron microscopy.The results show that SAP added in the form of dry powder absorbs water more 30%to 50%in the mortar matrix than preswelling SAP.SAP can effectively reduce the self-shrinkage of the mortar,and the inhibition on self-shrinkage is more obvious when SAP is directly added in the form of dry powder.The extra water can slightly reduce the early drying shrinkage,but it tends to cause the dry shrinkage of the mortar to become larger.SAP can refine the pore structure of the mortar,reduce the number of large pores between 50 to 1 000 nm,and increase the number of small pores smaller than 50 nm.The refinement effect of the dry powder SAP is more significant under the same dosage conditions.
作者 赖俊英 童彦伟 詹树林 钱晓倩 毕雨田 Lai Junying;TongYanwei;Zhan Shulin;Qian Xiaoqian;Bi Yutian(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处 《东南大学学报:自然科学版》 CSCD 北大核心 2018年第5期903-910,共8页 Journal of Southeast University (Natural Science Edition)
基金 浙江省重点研发计划资助项目(2017C01052).
关键词 高吸水性树脂 掺加方式 额外引水 自收缩 干燥收缩 孔结构 super-absorbent polymer adding mode extra water autogenous shrinkage dry shrinkage pore structure
作者简介 赖俊英(1977—),女,博士,副教授,junyinglai@zju.edu.cn.
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