HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响  

Effect of HCSA expansive agent and SAP on deformation of cement paste with low water binder ratio

作　　者：顾春平 徐艳文 韦海霞 GU Chunping;XU Yanwen;WEI Haixia(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Key Laboratory of Civil Engineering Structures&Disaster Prevention and Mitigation Technology of Zhejiang Province,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023 [2]浙江省工程结构与防灾减灾技术研究重点实验室,杭州310023

出　　处：《复合材料学报》2024年第5期2623-2632,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52378272);浙江省自然科学基金(LY22E080014);浙江省重点研发计划(2021C01060)。

摘　　要：为解决低水胶比下高性能硫铝酸钙(High performance calcium sulpho aluminate,HCSA)膨胀剂补偿收缩效果不显著这一问题,以高吸水树脂(Super-absorbent polymer,SAP)为内养剂,研究HCSA膨胀剂和SAP单掺、复掺对低水胶比(0.25)下水泥净浆体积变形(自收缩、干燥收缩、浸水变形)的影响,并探讨HCSA膨胀剂与SAP复掺的协同效应。结果表明:单掺HCSA膨胀剂和SAP均能降低水泥净浆的自收缩和干燥收缩、增大浸水条件下膨胀变形。密封和浸水条件下,HCSA的膨胀效果较干燥条件下时显著。复掺HCSA膨胀剂和SAP存在协同作用,SAP预吸水促进了HCSA膨胀剂效果的发挥。密封条件下,协同效应主要发生在约1天前,而后仍在缓慢发挥。浸水条件下,两者复掺也发挥一定的协同作用;干燥条件下,复掺的协同作用主要发生在7天之后,在早期SAP未能促进HCSA效能的发挥,反而使低水胶比水泥净浆干燥收缩变大。In order to solve the problem that the shrinkage compensation effect of high performance calcium sulpho aluminate(HCSA)expansive agent was not significant at a low water to binder ratio,this study used super-absorbent polymer(SAP)as the internal curing agent to study the influence of HCSA,SAP,HCSA and SAP together on the volume deformation(autogenous shrinkage,drying shrinkage,deformation in water)of cement paste with a low water to binder ratio(0.25),and the synergistic effect of HCSA expansive agent and SAP was discussed.The results show that both HCSA expansive agent and SAP reduce the autogenous shrinkage and dry shrinkage of cement paste,and increase the expansion deformation when immersed in water.The expansive effects of HCSA under sealed and immersed condition are more significant than that under drying condition.HCSA and SAP have synergistic effect,i.e.the pre-absorbed water by SAP could promote the effectiveness of HCSA.Under sealed condition,the synergistic effect mainly occur before about 1 day,and then it still work slowly.When immersed in water,HCSA and SAP also show synergistic effect.But under drying condition,the synergistic effect of HCSA and SAP mainly takes effect after 7 days.SAP could not promote the effectiveness of HCSA at early ages,and the addition of HCSA and SAP together increases the drying shrinkage of cement paste with low water to binder ratio.

关 键 词：水泥净浆 HCSA膨胀剂 SAP 自收缩 干燥收缩 

分 类 号：TU528[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]