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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3126-3139.DOI: 10.16552/j.cnki.issn1001-1625.2026.0289

• 水泥混凝土 • 上一篇    下一篇

超支化外加剂的合成及其对低水灰比水泥净浆的影响

毛志毅1(), 朱翼舟2, 杨仁和1, 郄非凡1, 张鹏宇1(), 孙倩1, 刘晓2()   

  1. 1.天津市建筑材料科学研究院有限公司,天津 300381
    2.北京工业大学材料科学与工程学院,材料循环低碳再生全国重点实验室,北京 100124
  • 收稿日期:2026-03-27 修订日期:2026-05-19 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 张鹏宇,博士,教授级工程师。E-mail:zpy329@163.com;
    刘 晓,博士,教授。E-mail:liux@bjut.edu.cn
  • 作者简介:毛志毅(1986—),男,博士,教授级高级工程师。主要从事混凝土外加剂开发方面的研究。E-mail:maozytj@163.com
  • 基金资助:
    国家自然科学基金(52372020);天津市科技计划项目(24YFYSHZ00240);北京金隅集团重点科研项目(B20244007)

Synthesis of Hyperbranched Admixture and Its Effect on Low Water-Cement Ratio Cement Paste

MAO Zhiyi1(), ZHU Yizhou2, YANG Renhe1, QIE Feifan1, ZHANG Pengyu1(), SUN Qian1, LIU Xiao2()   

  1. 1.Tianjin Building Materials Academy Co. ,Ltd. ,Tianjin 300381,China
    2.State Key Laboratory of Materials Low-Carbon Recycling,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China
  • Received:2026-03-27 Revised:2026-05-19 Published:2026-09-15 Online:2026-10-09

摘要:

为了实现超高性能混凝土流变性能的有效调控,以季戊四醇、丙烯酸、甲基烯丙基聚氧乙烯醚(HPEG)和硝酸铈铵(CAN)为原料合成了一种具有超支化拓扑结构的外加剂,并考察其对水灰比为0.18的水泥净浆的影响,同时考察了大单体的种类、分子量、季戊四醇与大单体的摩尔比及引发体系对水泥净浆流动度和黏度的影响。结果表明,大单体采用分子量为1 000 g/mol的HPEG,季戊四醇与大单体的摩尔比为0.012 5∶1,引发剂采用硝酸铈铵时,合成得到的超支化外加剂以0.3%(质量分数)掺量与0.7%(质量分数)掺量实验室合成梳状结构聚羧酸系减水剂复配,加入水灰比为0.18的水泥净浆,流动度为200 mm,黏度为1 637 mPa·s,黏度比市售的UHPC外加剂低31.8%,表现出较优的流变性能。凝胶渗透色谱、傅里叶变换红外光谱、流体力学半径、Zeta电位、总有机碳和流变性能测试等微观表征手段表明超支化拓扑结构外加剂具有紧凑的分子构象、丰富的端基官能团分布与较大的界面吸附速率,同时表现出较好的分散降黏性能。

关键词: 超支化外加剂, 分子设计, 低水灰比, 流变性能, 界面吸附, 降黏性能

Abstract:

In order to regulate the rheological properties of ultra-high performance concrete effectively, an admixture with hyperbranched topological structure was synthesized by pentaerythritol, acrylic acid, methyl acryloxy polyoxyethylene ether (HPEG) and ceric ammonium nitrate (CAN). The effects of the types and molecular weights of the monomers, the ratio of pentaerythritol to the monomers, and the initiator system on the fluidity and viscosity of the cement paste were investigated. The results show that when the monomer used is HPEG with a molecular weight of 1 000 g/mol, the ratio of pentaerythritol to the monomer is 0.012 5∶1, and the initiator used is ammonium cerium nitrate,the synthesized hyperbranched admixture combined with the laboratory-synthesized comb-like polycarboxylic water-reducing admixture at dosages of 0.3%(mass fraction) and 0.7%(mass fraction) respectively, is added to the cement paste with a water-cement ratio of 0.18, the flowability is 200 mm and the viscosity is 1 637 mPa·s. The viscosity is 31.8% lower than that of the commercially available UHPC admixture, achieving optimal rheological properties. Microscopic characterization methods, such as gel permeation chromatography, Fourier transform infrared spectroscopy, hydrodynamic radius, Zeta potential, total organic carbon and rheological property tests, were used to analyze the mechanism. The results show that the hyperbranched topological structure admixture has a compact molecular structure, a rich distribution of terminal functional groups, a fast interfacial adsorption rate, and also exhibits excellent dispersion and viscosity reduction properties.

Key words: hyperbranched admixture, molecular design, low water-cement ratio, rheological property, interface adsorption, viscosity reduction property

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