高吸水性聚合物对水泥砂浆长期收缩性能的影响  

Influence of Super Water-Absorbing Polymer on the Long-Term Shrinkage of Cement Mortar

作　　者：张国防[1,2] 陆小培 和瑞[1,2] 王亚文[1,2] 王培铭[1,2] ZHANG Guofang;LU Xiaopei;HE Rui;WANG Yawen;WANG Peiming(Key Laboratory of Advanced Civil ngineering Materials of Ministry of Education,Tongji University,Shanghai201804,China;School of Materials Science and ngineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804

出　　处：《建筑材料学报》2018年第3期472-477,共6页Journal of Building Materials

基　　金："十三五"国家重点研发计划项目(2016YFC0700905);国家自然科学基金资助项目(51102182);中德科研合作项目(GZ1290);固废资源化利用与节能建材国家重点实验室开放基金(SWR-2016-001)

摘　　要：研究了高吸水性聚合物(SAP)掺量和粒径范围变化对水泥砂浆长期干燥收缩性能和自收缩性能的影响规律,探讨了SAP影响水泥砂浆收缩性能的作用机理.结果表明:SAP能显著改善水泥砂浆在不同湿度条件下的长期干燥收缩性能,且湿度越低时,SAP改善作用越显著;SAP还能显著改善水泥砂浆的自收缩性能,尤其是早龄期时;SAP掺量和粒径范围变化显著影响到水泥砂浆的干燥收缩性能和自收缩性能,且存在着较佳掺量,但粒径范围不同的SAP对水泥砂浆中后期收缩性能的影响基本相同.SAP能显著改善水泥砂浆的长期收缩性能,主要原因在于SAP能显著提高水泥砂浆内部湿度,降低其水分散失速率;SAP的较佳掺量与其改善水泥砂浆内部湿度及溶胀颗粒失水坍缩的综合作用密切相关.Effect of super water-absorbing polymer（SAP）on the long-term drying shrinkage and autogenous shrinkage of cement mortar was investigated,and the working mechanism of SAP was discussed.The results show that SAP can greatly improve the long-term drying shrinkage resistance of cement mortar under different curing humidities.With curing humidity decreasing,the improvement of SAP enhances.Besides,SAP can significantly decrease the autogenous shrinkage,especially at the early age.The dosage variation and particle size distribution of SAP greatly affect the drying shrinkage and autogenous shrinkage with the existence of the optimal dosage of SAP.But the effects of particle size distribution variation of SAP at middle and late age are generally identical.The improvement mechanism of SAP on the long-term shrinkage of cement mortar is mainly attributed to the pronounced increase of the internal humidity by SAP with the slow release of absorbed water from its particles,and the optimal SAP dosage is closely related to the comprehensive effects of the improvement of internal humidity by SAP to decrease shrinkage and the collapse of swollen SAP particles to increase shrinkage.

关 键 词：水泥砂浆 高吸水性聚合物 干燥收缩性能 自收缩性能 作用机理 

分 类 号：TU528.31[建筑科学—建筑技术科学]