欢迎访问《硅酸盐通报》官方网站,今天是

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (6): 1903-1913.DOI: 10.16552/j.cnki.issn1001-1625.2025.1160

• 水泥混凝土 • 上一篇    下一篇

TEOS-IBT协同改性水泥净浆的疏水性能及机理研究

成子高1(), 丛贇2, 张琰3, 李根1, 郅天一1, 谭洪波1()   

  1. 1.武汉理工大学硅酸盐科学与先进建材全国重点实验室,武汉 430070
    2.国网浙江省电力有限公司舟山供电公司,舟山 316000
    3.国网电力工程研究院有限公司,北京 100069
  • 收稿日期:2025-11-20 修订日期:2025-12-24 出版日期:2026-06-15 发布日期:2026-07-14
  • 通信作者: 谭洪波,博士,教授。E-mail:thbwhut@whut.edu.cn
  • 作者简介:成子高(2002—),男,硕士研究生。主要从事水泥基材料改性的研究。E-mail:czgcailiao@163.com
  • 基金资助:
    国网浙江省电力有限公司科技项目(5211ZS250005)

Hydrophobic Properties and Mechanism of TEOS-IBT Synergistically Modified Cement Paste

CHENG Zigao1(), CONG Yun2, ZHANG Yan3, LI Gen1, ZHI Tianyi1, TAN Hongbo1()   

  1. 1.State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China
    2.State Grid Zhejiang Electric Power Co.,Ltd.,Zhoushan Power Supply Company,Zhoushan 316000,China
    3.State Grid Electric Power Research Institute Co.,Ltd.,Beijing 100069,China
  • Received:2025-11-20 Revised:2025-12-24 Published:2026-06-15 Online:2026-07-14

摘要:

为提升水泥基材料的疏水性能,采用异丁基三乙氧基硅烷(IBT)与正硅酸四乙酯(TEOS)对P·I 52.5水泥净浆(水灰比0.35)进行单掺与复掺改性,IBT或TEOS的掺量设置为1%~6%(质量分数),并在固定IBT掺量3%的基础上复掺1%~3%的TEOS。通过流动度、凝结时间、抗压强度、接触角、毛细吸水系数(S)、水化热等测试,并结合SEM、FTIR、XRD等手段对水泥净浆进行表征。结果表明:复掺体系能显著增强表面疏水性,IBT-3%+TEOS-3%复掺使接触角增大至140.0°,较单掺3% IBT时的接触角增大了58.37%。在水分传输性能方面,IBT-4%将毛细吸水系数S由对照组的0.004 19 mm·s-1/2降至0.000 99 mm·s-1/2;在固定IBT掺量为3%的基础上复掺TEOS(1%~3%)时,S为0.002 93~0.003 63 mm·s-1/2,虽高于IBT-3%单掺组,但较对照组降低13%~30%。基于上述结果,本研究揭示了TEOS和IBT内掺改性水泥净浆的作用机制,为疏水型水泥基材料的设计提供了可操作依据。

关键词: 水泥基材料, 异丁基三乙氧基硅烷, 正硅酸四乙酯, 疏水性, 改性

Abstract:

To improve the hydrophobic properties of cement-based materials, isobutyl triethoxysilane (IBT) and tetraethyl orthosilicate (TEOS) were used to singly and jointly modify P·I 52.5 Portland cement paste (water-cement ratio of 0.35). The content of IBT or TEOS was set to 1%~6% (mass fraction), and 1%~3% TEOS was compounded on the basis of fixing the IBT content at 3% (mass fraction). The cement paste was characterized by tests of fluidity, setting time, compressive strength, contact angle, capillary water absorption coefficient (S), heat of hydration, combined with characterization techniques such as SEM、FTIR and XRD. The results show that the co-admixture markedly amplifies surface hydrophobicity, the compound addition of IBT-3%+TEOS-3% increases the contact angle up to 140.0°, compared with the single addition of 3% IBT, the contact angle is increased by 58.37%. In terms of moisture transport performance, IBT-4% reduces capillary water absorption coefficient (S) from the control value of 0.004 19 mm·s-1/2 to 0.000 99 mm·s-1/2; When TEOS of 1%~3% is compounded on the basis of fixing the IBT content at 3%, S is 0.002 93~0.003 63 mm·s-1/2, higher than IBT-3% alone group but still 13%~30% lower than the control. Based on the above results, this study reveals the synergistic mechanism of TEOS and internally mixed IBT in modified cement paste, and provides an operable basis for the design of hydrophobic cement-based materials.

Key words: cement-based material, isobutyl triethoxysilane, tetraethyl orthosilicate, hydrophobicity, modification

中图分类号: