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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (8): 2650-2663.DOI: 10.16552/j.cnki.issn1001-1625.2026.0182

• 水泥混凝土 • 上一篇    下一篇

内掺硬脂酸钙乳液对混凝土性能的影响及作用机制

张翔(), 王玉凤(), 雷真   

  1. 云南大学建筑与规划学院,昆明 650500
  • 收稿日期:2026-02-27 修订日期:2026-03-27 出版日期:2026-08-15 发布日期:2026-09-01
  • 通信作者: 王玉凤,硕士研究生。E-mail:W.Yu.Feng@outlook.com
  • 作者简介:张翔(1989—),男,博士,副教授。主要从事岩土材料和建筑材料的研究。E-mail:x.zhang@ynu.edu.cn
  • 基金资助:
    云南省基础研究专项面上项目(202401AT070446);云南大学专业学位研究生实践创新项目(ZC-242410822);云南大学产教融合研究生联合培养基地项目(CZ22622203)

Effects and Mechanism of Internally Incorporated Calcium Stearate Emulsion on Properties of Concrete

ZHANG Xiang(), WANG Yufeng(), LEI Zhen   

  1. School of Architecture & Planning,Yunnan University,Kunming 650500,China
  • Received:2026-02-27 Revised:2026-03-27 Published:2026-08-15 Online:2026-09-01

摘要:

为系统研究内掺硬脂酸钙乳液对混凝土性能的影响规律及其作用机制,本文制备了水灰比分别为0.4与0.5,硬脂酸钙乳液有效掺量为0%、0.5%、1.0%、2.0%(质量分数)的混凝土试件,开展了工作性能、力学强度、孔结构与微观结构、疏水性、自清洁性、光稳定性及抗氯离子渗透性能等综合测试。结果表明:硬脂酸钙乳液能改善混凝土的工作性能,并使试件表面接触角由约60°提高至120°,但该乳液会抑制水泥的水化反应,导致混凝土结构致密性下降,进而影响混凝土各龄期的强度发展。经硬脂酸钙改性的混凝土表面对亲水性粉尘、疏水性石墨粉及含油脂污染物均表现出良好的自清洁效果。当硬脂酸钙掺量不高于1.0%时,混凝土的毛细吸水能力与氯离子渗透程度显著降低;而当掺量增至2.0%时,因孔隙结构劣化,混凝土的抗渗性能出现逆转,甚至劣于基准组。经180 d模拟光老化后,试件接触角下降不足1°,疏水性能保持相对稳定。

关键词: 混凝土, 疏水改性, 硬脂酸钙, 接触角, 抗沾污, 耐久性

Abstract:

To systematically investigate the influence law and mechanism of internally incorporated calcium stearate emulsion on the properties of concrete, concrete specimens with water-cement ratios of 0.4 and 0.5 and effective calcium stearate emulsion dosages of 0%, 0.5%, 1.0%, and 2.0% (mass fraction) were prepared. Comprehensive tests were conducted on workability, mechanical strength, pore structure and microstructure, hydrophobicity, self-cleaning ability, photostability, and resistance to chloride ion penetration. The results show that calcium stearate emulsion can improve the workability of concrete and increase the surface contact angle of specimens from approximately 60° to 120°, but it inhibits the hydration reaction of cement, leading to a decrease in the compactness of concrete structure, thereby affecting the strength development at various ages. The concrete surface modified by calcium stearate exhibits good self-cleaning effects on hydrophilic dust, hydrophobic graphite powder, and oily contaminants. When the calcium stearate dosage is not higher than 1.0%, the capillary water absorption capacity and chloride ion penetration degree of concrete are significantly reduced; when the dosage is increased to 2.0%, the impermeability performance of concrete reverses due to the deterioration of pore structure, and even becomes inferior to that of the control group. After 180 d of simulated photo-aging, the contact angle decreases by less than 1°, and the hydrophobic performance remains relatively stable.

Key words: concrete, hydrophobic modification, calcium stearate, contact angle, stain resistance, durability

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