超高分子聚乙烯纤维应变硬化地聚物复合材料力学性能研究

白琳; 金辰华; 吴畅; 孟少平

doi:10.3724/j.gyjzG25042104

超高分子聚乙烯纤维应变硬化地聚物复合材料力学性能研究

doi: 10.3724/j.gyjzG25042104

白琳¹,
金辰华¹,
吴畅²,
孟少平^3, ,

1. 金陵科技学院建筑工程学院, 南京 211199;
2. 东南大学土木工程学院, 南京 211189;
3. 长三角碳纤维及复合材料技术创新中心, 江苏常州 213125

基金项目:

国家自然科学基金面上项目（52478146）。

详细信息

作者简介:
白琳，硕士研究生，主要从事高性能混凝土结构研究。

通讯作者:
孟少平，博士，教授，博士生导师，主要从事现代预应力结构体系及相应性能方面的研究， msp1960@vip.sina.com。

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出版历程
- 收稿日期: 2025-04-21
- 网络出版日期: 2026-02-26
- 刊出日期: 2026-01-22

Research on the Mechanical Properties of Strain-Hardening Geopolymer Composites Reinforced with PE Fibers

1. School of Architectural Engineering, Jinling Institute of Technology, Nanjing 211199, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China;
3. Yangtze River Delta Carbon Fiber & Composite Innovation Center, Changzhou 213125, China

摘要

摘要: 通过纤维增韧复合技术，设计并配制了一种具有准应变硬化特性的纤维增强地聚物复合材料，有效改善了传统地聚物韧性差、开裂敏感等缺陷。首先通过正交试验初拟该复合材料的配合比，并在此基础上展开单因素试验研究，根据流变性能、抗压强度、抗折强度、X射线衍射（XRD）、扫描电镜（SEM）等试验结果确定该复合材料的最佳配合比，最后采用直接拉伸试验、四点弯曲试验对其拉伸性能进行研究。结果表明：在碱激发的作用下，基体材料中硅铝物质逐渐溶解，凝聚为—Si—O—Al—网状结构，材料中形成的C-S-H凝胶与N-A-S-H凝胶使其获得强度；当水胶比为0.5，纤维掺量为2%，水玻璃模数为1.2，碱激发剂掺量为20%时，该复合材料具有优异的力学性能（28 d抗压强度46.25 MPa，抗折强度7.70 MPa，拉伸应变达到了3%，抗弯强度13.3 MPa）；在拉伸性能试验中，试件表面出现多条细密裂缝，应力-应变曲线呈现出明显的准应变硬化特征。
- 工程地质聚合物复合材料 /
- 地质聚合物 /
- 粉煤灰 /
- S95矿粉 /
- 偏高岭土
Abstract: Through fiber toughening composite technology， a fiber-reinforced geopolymer composite with quasi-strain-hardening characteristics was designed and prepared， effectively addressing the shortcomings of traditional geopolymers such as poor toughness and crack sensitivity. First， the initial mix proportion design of the composite was proposed through orthogonal experiments， followed by single-factor experimental studies. The optimal mix ratio was determined based on test results including rheological properties， compressive strength， flexural strength， X-ray diffraction （XRD）， and scanning electron microscopy （SEM）. Finally， direct tensile tests and four-point bending tests were conducted to investigate its tensile behavior. The results demonstrated that under alkali activation， silicon-aluminum substances in the matrix gradually dissolved and condensed into a —Si—O—Al— network structure. The formation of C-S-H and N-A-S-H gels within the material contributed to its strength. When the water-to-binder ratio was 0.5， fiber dosage was 2%， sodium silicate modulus was 1.2， and alkali activator content was 20%， the composite exhibited excellent mechanical properties （28-day compressive strength： 46.25 MPa， flexural strength： 7.70 MPa， tensile strain： 3%， and bending strength： 13.3 MPa）. During tensile testing， multiple fine cracks appeared on the specimen surface， and the stress-strain curve displayed distinct quasi-strain-hardening characteristics.
- engineering geopolymer composites /
- geopolymer /
- fly ash /
- GGBS /
- Metakaolin

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参考文献(11)

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