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 (7): 2226-2236.DOI: 10.16552/j.cnki.issn1001-1625.2026.0054

• 水泥混凝土 • 上一篇    下一篇

油酸改性超细水泥对注浆材料性能的影响

曹宇杰1(), 刘律2, 黄栋2, 黄超群2, 刘云鹏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.武汉市市政建设集团有限公司隧道工程公司,武汉 430015
  • 收稿日期:2026-01-14 修订日期:2026-03-03 出版日期:2026-07-15 发布日期:2026-08-13
  • 通信作者: 刘云鹏,博士,研究员。E-mail:liuyunpeng@whut.edu.cn
  • 作者简介:曹宇杰(2001—),男,硕士研究生。主要从事安全与防护材料的研究。E-mail:344741@whut.edu.cn
  • 基金资助:
    国家自然科学基金(51972250)

Influence of Oleic Acid Modified Ultrafine Cement on Performance of Grouting Materials

CAO Yujie1(), LIU Lv2, HUANG Dong2, HUANG Chaoqun2, LIU Yunpeng1()   

  1. 1.State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China
    2.Wuhan Municipal Construction Group Co.,Ltd.,Tunnel Engineering Company,Wuhan 430015,China
  • Received:2026-01-14 Revised:2026-03-03 Published:2026-07-15 Online:2026-08-13

摘要:

超细水泥(UPC)在混凝土微裂缝修复中面临低水灰比下浆体流动性差、孔隙率高、易溶蚀等问题。本研究提出采用油酸对UPC进行表面改性,以同步提高其可注性与疏水性。采用球磨法制备了油酸掺量为0%~0.3%(质量分数)的油酸改性UPC。系统评估了改性UPC浆体的流变性能、抗压强度、水化热、疏水特性、界面粘接强度,并通过FTIR、SEM、TG、LF-NMR等微观手段揭示其改性机理。结果表明:适量(0.1%)油酸改性可降低注浆材料的黏度,改善流变特性;同时,该掺量下油酸对水泥水化的抑制作用较小,对浆体的强度影响不大,并显著降低浆体的自收缩。油酸参与水泥颗粒表面改性,使硬化后浆体的接触角从48.6°增至126.4°。然而,过量(>0.2%)油酸会严重抑制水化反应,使浆体28 d抗压强度从54.95 MPa降至23.08 MPa,并且增大自收缩与孔隙率。本研究探讨了油酸在UPC中的作用机制与掺量阈值,为开发高性能微裂缝防渗修复材料提供了支撑。

关键词: 超细水泥, 油酸, 疏水性, 水化过程, 孔结构

Abstract:

In the repair of concrete micro-cracks, ultrafine cement (UPC) faces the problems of poor slurry fluidity, high porosity and susceptibility to dissolution under low water-cement ratio. In this study, the surface modification of UPC with oleic acid was proposed to simultaneously improve its injectability and hydrophobicity. Oleic acid modified UPC with oleic acid content of 0%~0.3% (mass fraction) was prepared by ball milling method. The rheological properties, compressive strength, heat of hydration, hydrophobic properties and interfacial bond strength of the modified UPC paste were systematically evaluated, and the modification mechanism was revealed by FTIR, SEM, TG, LF-NMR. The results show that appropriate amount of oleic acid (0.1%) modification can reduce the viscosity of grouting material and improve the rheological properties. At the same time, at this dosage, the inhibition effect on cement hydration is small, the strength of the slurry is not much affected, and the autogenous shrinkage of the slurry is significantly reduced. Oleic acid is involved in the surface modification of cement particles, and the contact angle of hardened slurry increases from 48.6° to 126.4°. However, an excessive amount of oleic acid (>0.2%) severely inhibits the hydration reaction, reduces the 28 d compressive strength from 54.95 MPa to 23.08 MPa, and increases the autogenous shrinkage and porosity. In this paper, the study investigates the action mechanism and dosage threshold of oleic acid in UPC, which provides support for the development of high-performance microfracture anti-seepage repair materials.

Key words: ultrafine cement, oleic acid, hydrophobicity, hydration process, pore structure

中图分类号: