| 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. |
| 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 |
| DOI：10.3969/j.issn.1007-9629.2024.09.003 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51578412，51878479，52078372，52108239） |
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| Effects of DEIPA and C-S-H-PCEs on Early Properties of Cement-Fly Ash Systems |
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LIU Chi1,2, GUO Junyuan1,2, YANG Xiaojie1,2, CHEN Xueting1,2, LI Haoxin1,2
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1.School of Materials Science and Engineering，Tongji University， Shanghai 201804，China;2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804，China
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| Abstract: |
| In order to improve the early performance of cement-fly ash system， the effects of diethanol-monoisopropanolamine （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. |
| Key words: cement-fly ash system diethanol-monoisopropanolamine calcium silicate hydrate crystal nucleus early strengthening agent early strength |
