Hong Li, Li Tadan, Chen Yadi, Gao Peng, Sun Lizhi
Department of Structural Engineering, Hefei University of Technology, Hefei 230009, China.
Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University, Shanghai 200092, China.
Materials (Basel). 2020 Nov 9;13(21):5037. doi: 10.3390/ma13215037.
Basalt fibers have been adopted as reinforcements to improve mechanical performance of concrete materials and structures due to their excellent corrosion resistance, affordable cost, and environmental-friendly nature. While the reinforcing efficiency is significantly dependent on fiber-matrix interfacial properties, there is a lack of studies focusing on the bonding behavior of basalt fibers in the mortar matrix. In this paper, a series of experiments were carried out to investigate the characteristics of single basalt fiber pulled out from the mortar matrix. Three embedment lengths and three types of mortar strength were considered. As references, the pull-out behavior of single polyvinyl alcohol (PVA) fiber and glass fiber in mortar matrix were also tested for comparison. Results from the pull-out test revealed that the average bonding strength is more effective than the equivalent shear bonding strength to illustrate the interfacial bond behavior of single basalt fiber in mortar matrix, which can be improved by either longer embedment length or the stronger mortar matrix. Finally, the tensile and compressive strengths of basalt/PVA/glass fiber-reinforced concrete (FRC) were measured to investigate the influence of interfacial shear bonding strengths. It was shown that, while PVA fiber developed the highest shear bonding strength with mortar, the basalt fiber exhibited the best reinforcing efficiency of FRC.
玄武岩纤维因其优异的耐腐蚀性、成本低廉且环保的特性，已被用作增强材料来改善混凝土材料和结构的力学性能。虽然增强效率很大程度上取决于纤维与基体的界面性能，但缺乏针对玄武岩纤维在砂浆基体中粘结行为的研究。本文开展了一系列实验，以研究从砂浆基体中拔出的单根玄武岩纤维的特性。考虑了三种埋入长度和三种砂浆强度类型。作为参考，还测试了单根聚乙烯醇（PVA）纤维和玻璃纤维在砂浆基体中的拔出行为以作比较。拔出试验结果表明，平均粘结强度比等效剪切粘结强度更能有效说明单根玄武岩纤维在砂浆基体中的界面粘结行为，较长的埋入长度或更强的砂浆基体均可改善这种粘结行为。最后，测量了玄武岩/PVA/玻璃纤维增强混凝土（FRC）的抗拉和抗压强度，以研究界面剪切粘结强度的影响。结果表明，虽然PVA纤维与砂浆的剪切粘结强度最高，但玄武岩纤维对FRC的增强效果最佳。
