高性能胶浸渍碳纤维束的拉伸性能研究  

Tensile properties of high-performance adhesive impregnated carbon fiber bundles

作　　者：杜运兴[1] 董诚宇 付争强 周芬[1] DU Yunxing;DONG Chengyu;FU Zhengqiang;ZHOU Fen(School of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《铁道科学与工程学报》2024年第11期4677-4686,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52378299,52178206)。

摘　　要：为进一步加强碳纤维编织网增强混凝土(Carbon Textile Reinforced Concrete, CTRC)的力学性能,需对纤维束进行浸胶处理,常用的胶粘剂中环氧树脂不耐高温、钠水玻璃不耐水、碱激发胶凝材料不适合浸渍碳纤维,为了研制耐水、耐碱、耐高温、适合浸渍碳纤维的高性能胶,以界面剂与钠水玻璃的质量比作为变量,测试浸胶碳纤维束在常温、水以及碱性溶液环境下(1、2、4 d)的拉伸强度。将浸胶后的碳纤维束置于地聚物净浆中以及高温环境中,研究实际工作环境对浸胶碳纤维束拉伸强度的影响,最后借助扫描电子显微镜和能谱仪观察其微观结构特征和表面的元素变化。研究结果表明:相比未浸胶碳纤维束,室温下浸渍高性能胶后的碳纤维束拉伸强度显著提升(约72.4%)。高性能胶中掺入的界面剂含量越大,胶体的耐水、耐碱性越强,但胶体的硬度越低。如果界面剂掺量不小于钠水玻璃质量的0.5倍,胶体具有良好的耐水和耐碱性,可在地聚物净浆中保持其黏结性能。如果钠水玻璃和界面剂质量相等,浸胶碳纤维束在200℃温度下拉伸强度只降低7%,表明其耐高温性能好。此外,扫描电镜和能谱仪的结果表明高性能胶的成膜性好,表面并未观察到孔洞等缺陷,且胶体在浸水后未软化,表面Si元素也没有明显减少,说明界面剂的掺入可以很好地保护水玻璃凝胶,有效改善水玻璃胶体耐水性差的特点。高性能胶中界面剂最佳掺量为钠水玻璃质量的0.5~1倍。研究结果为进一步研制耐高温CTRC材料提供参考。To enhance the mechanical properties of carbon textile reinforced concrete(CTRC),it is imperative to impregnate the fiber bundles.Among the commonly utilized adhesives,epoxy resin is not resistant to high temperature,sodium silicate is not resistant to water,and alkali-activated cementitious material is not suitable for impregnating carbon fiber.To formulate a high-performance adhesive possessing water resistance,alkali resistance,and high-temperature resistance suitable for impregnating carbon fibers,the mass ratio of interface agent to sodium silicate as variables to test the tensile strength of impregnated carbon fiber bundles at room temperature,water,and alkaline solution environments(1,2,4 days).The effect of actual working environment on the tensile strength of impregnated carbon fiber bundles was studied by placing the impregnated carbon fiber bundles in geopolymer paste and high temperature environment.Finally,scanning electron microscope(SEM)and energy dispersive spectrometer(EDS)were employed to observe microstructure characteristics and surface element changes.Test results are drawn as follows.A notable enhancement(approximately 72.4%)in the tensile strength of carbon fiber bundles can impregnate with high-performance adhesive at room temperature compared to unimpregnated counterparts.Higher interfacial agent content correlates with stronger water and alkali resistance of the colloid but entails reduced colloid hardness.The interfacial agent content equal to or exceeding 0.5 times the mass of sodium silicate ensures good water and alkali resistance while maintaining its bonding performance in geopolymer paste.When the mass of sodium silicate equals that of the interfacial agent,the tensile strength of the impregnated carbon fiber bundle at 200℃experiences only a marginal 7%reduction,signifying robust high-temperature resistance.In addition,the results of SEM and EDS show that the highperformance adhesive has good film-forming properties,and no defects such as holes were observed on the surface.The a

关 键 词：碳纤维 水玻璃 拉伸试验 耐水性 耐碱性 耐高温 

分 类 号：TU528[建筑科学—建筑技术科学]