| 摘要: |
| 研究了羟乙基纤维素（HEC）和高低取代度羟乙基甲基纤维素（H-HMEC、L-HEMC）对硫铝酸盐（CSA）水泥早期水化进程和水化产物的影响.结果表明：不同掺量L-HEMC均可促进CSA水泥在45.0 min~10.0 h内的水化；3种纤维素醚均先延缓CSA水泥溶解及其转化阶段的水化，后促进2.0~10.0 h内的水化；甲基的引入增强了含羟乙基纤维素醚对CSA水泥水化的促进作用，L-HEMC的促进作用最强；不同取代基和取代度的纤维素醚对水化前12.0 h内水化产物生成量的影响存在显著差异，HEMC对水化产物的促进作用强于HEC，L-HEMC改性CSA水泥浆体在水化2.0、4.0 h时生成钙钒石和铝胶的量最多. |
| 关键词: 硫铝酸盐水泥 纤维素醚 取代基 取代度 水化进程 水化产物 |
| DOI：10.3969/j.issn.1007-9629.2022.08.010 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51872203， 51572196）；中德科学中心资助项目（GZ 1290） |
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| Effect of Cellulose Ethers with Hydroxyethyl Group on Early Hydration of CSA Cement |
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WANG Ru1,2, LIU Ke1,2, WAN Qin1,2, LI Jian1,2, ZHANG Zhenlei1,2
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China
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| Abstract: |
| The effects of hydroxyethyl cellulose（HEC） and hydroxyethyl methyl cellulose with high and low substitution degree （H-HEMC， L-HEMC） on the early hydration process and hydration products of calcium sulphoaluminate（CSA） cement were studied. The results show that different dosages of L-HEMC can promote the hydration of CSA cement from 45.0 min to 10.0 hours. All the three kinds of cellulose ethers firstly delay the hydration of CSA cement during the dissolution and transformation stage， and then promote the hydration of CSA cement from 2.0 hours to 10.0 hours. The introduction of methyl group enhances the hydration promotion effect of cellulose ether on CSA cement， and the promoting effect of L-HEMC is the strongest. There are significant differences in the effect of different substituent groups and substitution degree on the production of hydration products produced within 12.0 hours. The promotion effect of HEMC on hydration products is stronger than that of HEC. The amount of ettringite and aluminium hydroxide generated in L-HEMC modified cement paste are the most at hydration for 2.0 hours and 4.0 hours. |
| Key words: calcium sulphoaluminate cement cellulose ether substituent substitution degree hydration process hydration product |
