DEIPA和C-S-H-PCEs复掺对水泥-粉煤灰体系早期性能的影响  

Effects of DEIPA and C-S-H-PCEs on Early Properties of Cement-Fly Ash Systems

作　　者：刘驰 郭君渊 杨晓杰[1,2] 陈雪婷 李好新[1,2] LIU Chi;GUO Junyuan;YANG Xiaojie;CHEN Xueting;LI Haoxin(School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China)

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

出　　处：《建筑材料学报》2024年第9期789-795,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51578412,51878479,52078372,52108239)。

摘　　要：为提高水泥-粉煤灰体系的早期性能,将二乙醇-单异丙醇胺(DEIPA)和水化硅酸钙晶核(C-S-H-PCEs)这2种早强剂进行复掺,研究其对水泥-粉煤灰体系凝结时间、流动度和抗压强度的影响规律,同时结合X射线衍射仪(XRD)、热重-差示扫描量热(TG-DSC)分析和扫描电镜(SEM)探讨其作用机理.结果表明:DEIPA和C-S-H-PCEs复掺可缩短水泥-粉煤灰净浆的凝结时间,增加其流动度,提高砂浆抗压强度;0.03%DEIPA和2.00%C-S-H-PCEs复掺效果最优,净浆流动度增加217.5 mm,初凝和终凝时间分别缩短120、127 min,砂浆1、3 d抗压强度分别提高6.6、6.1 MPa.In order to improve the early performance of cement-fly ash system,the effects of diethanolmonoisopropanolamine(DEIPA)and calcium silicate hydrate crystal nucleus(C-S-H-PCEs)on the setting time,fluidity and compressive strength of the system were studied.X-ray diffraction(XRD),thermogravimetric-differential scanning calorimetry(TG-DSC)and scanning electron microscopy(SEM)were used to investigate the mechanism of the two early strengthening agents.The results show that the combination of the two early strengthening agents can shorten the setting time,increase the fluidity and enhance the compressive strength.The combined effect of 0.03%DEIPA and 2.00%C-S-H-PCEs is the best,the fluidity increases by 217.5 mm,the initial and final setting time decreases by 120,127 min,respectively,and the compressive strength increases by 6.6,6.1 MPa at 1,3 d,respectively.

关 键 词：水泥-粉煤灰体系 二乙醇-单异丙醇胺 水化硅酸钙晶核 早强剂 早期强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]