Coupled effect of viscosity enhancing admixtures and superplasticizers on rheological behavior of cement paste  

作　　者：元强 刘文涛 王超 邓德华 刘赞群 龙广成 

机构地区：[1]School of Civil Engineering,National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China

出　　处：《Journal of Central South University》2017年第9期2172-2179,共8页中南大学学报（英文版）

基　　金：Project(2017YFB0310101)supported by National High Technology Research and Development Program of China;Project(51778269)supported by the National Natural Science Foundation of China

摘　　要：The coupled effect of viscosity enhancing admixtures(VEA)and superplasticizer(SP)on the rheological behavior of cement paste was investigated in this work.Two types of VEAs,including hydroxypropyl methylcellulose(HPMC)and Welan gum,and two types of SPs,i.e.polycarboxylate(PCA)and polynaphthalenesulfonate(PNS)were used as admixtures for cement paste.Rheological curves of cement paste and simulated pore solution containing VEA and SP were tested.Simulated pore solution test results show that molecules of different SPs may generate different effects on the viscosity of VEA solutions.Hershel-Bulkley(H-B)model was used to fit rheological curve of cement paste.Strong interaction between PNS and HPMC was observed in this work.The coupled effect of viscosity enhancing admixtures（VEA）and superplasticizer（SP）on the rheological behavior of cement paste was investigated in this work.Two types of VEAs,including hydroxypropyl methylcellulose（HPMC）and Welan gum,and two types of SPs,i.e.polycarboxylate（PCA）and polynaphthalenesulfonate（PNS）were used as admixtures for cement paste.Rheological curves of cement paste and simulated pore solution containing VEA and SP were tested.Simulated pore solution test results show that molecules of different SPs may generate different effects on the viscosity of VEA solutions.Hershel-Bulkley（H-B）model was used to fit rheological curve of cement paste.Strong interaction between PNS and HPMC was observed in this work.

关 键 词：rheology cement viscosity enhancing admixture SUPERPLASTICIZER 

分 类 号：TU528[建筑科学—建筑技术科学]