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不同设计变量的网格型碳纤维增强塑料织物增强砂浆的拉伸行为评估

Tensile Behavior Assessment of Grid-Type CFRP Textile-Reinforced Mortar with Different Design Variables.

作者信息

Suh Jung-Il, Park Sung-Woo, Kim Kyung-Min

机构信息

Construction Technology Research Center, Construction Division, Korea Conformity Laboratories, 199, Gasan Digital 1-ro, Geumcheon-gu, Seoul 08503, Republic of Korea.

出版信息

Materials (Basel). 2024 Dec 10;17(24):6049. doi: 10.3390/ma17246049.

DOI:10.3390/ma17246049
PMID:39769649
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11727903/
Abstract

This study investigates the tensile behavior of carbon-fiber-reinforced polymer (CFRP) and textile-reinforced mortar (TRM) under various design variables to enhance understanding and application in construction structures. TRM reinforced with CFRP grids is highly effective for strengthening existing structures due to its lightweight nature, durability, ease of installation, and corrosion resistance. The research aims to evaluate how design parameters such as the CFRP grid type, mortar matrix strength (influenced by the water-to-cement ratio), specimen length, and grid width affect TRM's mechanical properties. Through the direct tensile test using a universal testing machine, TRM specimens were subjected to load until failure, with data collected on stress-strain relationships, crack patterns, and strengths. Specimens included untreated CFRP grids (Groups KC, Q47, and Q85) and sand-coated CFRP grids (Specimens AQ47_7 and AQ85_7), each tested under controlled laboratory conditions. The results indicate that crack formation significantly influenced load transfer mechanisms within the specimens, with longitudinal strands bearing load as cracks propagated through the mortar matrix. The presence of sand-coated CFRP grids notably enhanced interfacial bond strength, leading to increased cracking strength and ultimate strength compared with their untreated counterparts. The findings underscore the importance of the surface treatment of CFRP grids for improving TRM performance, with implications for enhancing structural integrity and durability in practical applications. The results provide valuable insights into optimizing TRM design for better crack control and mechanical efficiency in infrastructure.

摘要

本研究调查了碳纤维增强聚合物（CFRP）和织物增强砂浆（TRM）在各种设计变量下的拉伸行为，以增进对其在建筑结构中的理解和应用。由于其重量轻、耐久性好、易于安装和耐腐蚀，用CFRP网格增强的TRM对加固现有结构非常有效。该研究旨在评估诸如CFRP网格类型、砂浆基体强度（受水灰比影响）、试件长度和网格宽度等设计参数如何影响TRM的力学性能。通过使用万能试验机进行直接拉伸试验，对TRM试件施加荷载直至破坏，并收集应力-应变关系、裂缝模式和强度数据。试件包括未处理的CFRP网格（KC组、Q47组和Q85组）和涂砂CFRP网格（试件AQ47_7和AQ85_7），每组均在受控的实验室条件下进行测试。结果表明，裂缝的形成对试件内部的荷载传递机制有显著影响，随着裂缝在砂浆基体中扩展，纵向束承受荷载。涂砂CFRP网格的存在显著提高了界面粘结强度，与未处理的对应物相比，开裂强度和极限强度均有所提高。研究结果强调了CFRP网格表面处理对提高TRM性能的重要性，这对在实际应用中增强结构完整性和耐久性具有重要意义。研究结果为优化TRM设计以更好地控制裂缝和提高基础设施的力学效率提供了有价值的见解。

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