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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3017-3026.DOI: 10.16552/j.cnki.issn1001-1625.2026.0183

• 水泥混凝土 • 上一篇    下一篇

低气压环境下剑麻纤维-水泥砂浆收缩性能及微观孔结构研究

孙彬强1(), 田茂盛1, 郑磊1, 谢超2(), 代金鹏2, 谢登魁2   

  1. 1.甘肃一安建设科技集团有限公司,兰州 730060
    2.兰州交通大学土木工程学院,兰州 730070
  • 收稿日期:2026-03-02 修订日期:2026-04-30 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 谢 超,博士,副教授。E-mail:327600231@qq.com
  • 作者简介:孙彬强(1979—),男,高级工程师。主要从事工程管理工作和水泥基复合材料性能研究。E-mail:2573885013@qq.com
  • 基金资助:
    甘肃省重点研发计划(24YFGA042);兰州市青年科技人才创新项目(23-QN-19);甘肃省住房和城乡建设厅科研项目(JK2024-33)

Shrinkage Performance and Micro-Pore Structure of Sisal Fiber-Reinforced Cement Mortar under Low Atmospheric Pressure Environment

SUN Binqiang1(), TIAN Maosheng1, ZHENG Lei1, XIE Chao2(), DAI Jinpeng2, XIE Dengkui2   

  1. 1.Gansu Yi’an Construction Technology Group Co. ,Ltd. ,Lanzhou 730060,China
    2.College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China
  • Received:2026-03-02 Revised:2026-04-30 Published:2026-09-15 Online:2026-10-09

摘要:

为探究高原低气压环境下剑麻纤维-水泥砂浆收缩性能及微观孔结构的发展规律,本文设置了57.6与95.0 kPa两种气压养护环境,采用5、10、15、20 mm剑麻纤维,制备了剑麻纤维-水泥砂浆试件,研究了其收缩性能、劈裂抗拉强度、微观孔结构及断裂面形貌。结果表明,养护环境气压下降会使各组试件的收缩率显著提升,劈裂抗拉强度下降,微观孔结构劣化。相较于95.0 kPa气压环境,57.6 kPa气压环境下试件的收缩率上升了5.9%~13.1%,劈裂抗拉强度下降了8.3%~10.9%,孔隙率增大了14.9%~21.9%,且孔径粗化。添加剑麻纤维能够抑制水泥砂浆的收缩,并提高其劈裂抗拉强度。相较于无纤维试件,剑麻纤维-水泥砂浆试件在57.6和95.0 kPa气压环境下的收缩率分别下降了5.3%~15.3%和3.0%~9.5%,劈裂抗拉强度分别提升了8.8%~29.4%和7.9%~26.3%。此外,10 mm剑麻纤维可在基体中良好分散并高效传递应力,其抑制水泥砂浆收缩及提升基体强度的效果最优。

关键词: 低气压环境, 剑麻纤维, 水泥砂浆, 收缩性能, 劈裂抗拉强度, 孔结构

Abstract:

To investigate the shrinkage performance and micro-pore structure evolution of sisal fiber-reinforced cement mortar under plateau low atmospheric pressure environments, this study simulated two curing pressure conditions: 57.6 and 95.0 kPa. Cement mortar specimens reinforced with sisal fibers of varying lengths (5, 10, 15, and 20 mm) were prepared. The shrinkage performance, splitting tensile strength, micro-pore structure, and fracture surface morphology were systematically evaluated.The results indicate that reducing the curing environment atmospheric pressure significantly increases the shrinkage rate, reduces the splitting tensile strength, and deteriorates the micro-pore structure of all specimen groups. Compared to the 95.0 kPa atmospheric pressure environment, specimens cured at 57.6 kPa exhibit 5.9% to 13.1% increase in shrinkage rate, 8.3% to 10.9% decrease in splitting tensile strength, and 14.9% to 21.9% increase in porosity, accompanied by pore coarsening. The incorporation of sisal fibers effectively inhibits the shrinkage of cement mortar and enhances its splitting tensile strength. Compared to plain mortar, the shrinkage rates of sisal fiber-reinforced cement mortar specimens decrease by 5.3% to 15.3% and 3.0% to 9.5% under 57.6 and 95.0 kPa, respectively. Meanwhile, the splitting tensile strength increases by 8.8% to 29.4% and 7.9% to 26.3%, respectively. Furthermore, the 10 mm sisal fibers demonstrate the optimal effect in inhibiting shrinkage and enhancing matrix strength, attributed to their excellent dispersion within the matrix and efficient stress transfer capability.

Key words: low atmospheric pressure environment, sisal fiber, cement mortar, shrinkage performance, splitting tensile strength, pore structure

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