Durability of Fibre Reinforced Polymer (FRP) rods in low carbon concrete

低碳混凝土中纤维增强聚合物 (FRP) 棒的耐久性

• 批准号: 2738755
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2738755
• 关键词: Durability; Fibre; Reinforced; Polymer; FRP

Fiber-Reinforced Polymer (FRP) bars have emerged as a promising alternative to conventional steel reinforcement in the construction industry due to their superior durability performance. FRP bars exhibit non-corrosive properties, effectively addressing the primary issue of steel corrosion-induced degradation in concrete structures. Steel corrosion can lead to prohibitive repair costs in civil infrastructure and brittle catastrophic failures (e.g., the collapse of Morandi bridge). Despite the corrosion-free nature of FRP rods, their matrix/resin component plasticises when exposed to humid conditions (e.g., at a concrete crack location) and degrades due to chemical attack. This is more critical for matrix dominated properties of concrete structures reinforced with FRP bars such as the bond, shear and transverse compressive strength of FRPs. This project focuses on a comprehensive examination of the long-term performance of Glass Fiber Reinforced Polymer (GFRP) and Basalt Fiber Reinforced Polymer (BFRP) bars under various environmental conditions by simulating aggressive environmental conditions, including elevated temperatures, saline, and alkaline exposures, to evaluate the performance of GFRP and BFRP bars.The project aims to create a test protocol that correlates FRP durability performance under accelerated ageing conditions and short-term exposures with actual on-site conditions. Key variables of interest are resin dominated properties in of FRPs and effect of stress conditions. This test protocol will shed light on the reliability of commonly applied accelerated ageing tests adopted in lab conditions. The test protocol is adopted for both resin samples and FRP bars to obtain an in-depth understanding of how the individual constituents, fiber, matrix perform but also the FRP system performs accounting also for fiber-matrix interfaces. The potential incorporation of FRP bars under applied stresses adds a crucial dimension by examining their degradation properties when subjected to load-bearing conditions while exposed to aggressive environments, closely mimicking real-world applications.FRP bars will be examined after being exposed to normal and accelerated conditions to be tested to measure their interlaminar and transverse shear strength. Non-exposed and pre-exposed FRP bars will be cast in concrete beams and blocks to measure the effect of exposure degradation on the bond and flexural performance of FRP bars in concrete structures. Resin samples will be cast, exposed, and tested separately to see the effect of direct exposure to pure resin samples after being tested in tension and shear. The type of exposure that will be used to understand the acceleration effect of the used protocol will be by comparing the degradation effect of directly exposed FRP samples in an alkaline mixture that replicates the pH and chemistry of concrete but at elevated temperatures to increase the diffusion to the composite material.The outcomes of this project offer wide-ranging benefits to the construction industry and sustainability endeavors:a. Enhanced Infrastructure Durability: The development of FRP bars with improved long-term performance can extend the lifespan of concrete structures, resulting in reduced maintenance costs and enhanced sustainability.b. Advancing Net-Zero Construction: The utilization of low carbon concrete reinforced with FRP bars aligns seamlessly with the UK's net-zero emissions targets, making this research directly relevant to sustainability goals.c. Industry-Wide Adoption: The newly established acceleration protocol can be readily adopted across the construction industry to assess the durability of FRP bars, ensuring the reliability and safety of construction projects.This project delves into the promising realm of Fiber-Reinforced Polymer (FRP) bars as a durable alternative to traditional steel reinforcement in construction while working towards more sustainable and durable approaches.

纤维增强聚合物（FRP）筋由于其上级耐久性能而成为建筑行业中传统钢筋的有前途的替代品。FRP筋具有非腐蚀性，有效地解决了混凝土结构中钢筋腐蚀引起的退化的主要问题。钢腐蚀可导致民用基础设施中过高的维修成本和脆性灾难性故障（例如，莫兰迪桥（Morandi Bridge）尽管玻璃钢棒具有防腐蚀性，但当暴露在潮湿条件下时，其基质/树脂成分会塑化（例如，在混凝土裂缝位置处）并且由于化学侵蚀而降解。这对于FRP筋混凝土结构的基体主导性能（如FRP的粘结、剪切和横向抗压强度）更为关键。该项目的重点是通过模拟恶劣的环境条件，包括高温、盐水和碱性暴露，对玻璃纤维增强聚合物（GFRP）和玄武岩纤维增强聚合物（BFRP）钢筋在各种环境条件下的长期性能进行全面检查，评估GFRP和BFRP筋的性能。该项目旨在创建一个测试协议，该协议与加速老化下的FRP耐久性性能相关条件和短期暴露与实际现场条件。感兴趣的关键变量是FRP中树脂占主导地位的性质和应力条件的影响。本试验方案将阐明在实验室条件下采用的常用加速老化试验的可靠性。试验方案适用于树脂样品和FRP筋，以深入了解各个成分、纤维、基质的性能以及FRP系统的性能，同时考虑纤维-基质界面。FRP筋在外加应力下的潜在结合增加了一个关键的维度，即在暴露于侵蚀性环境的同时，在承受荷载条件下检查其降解性能，密切模仿真实世界的应用。FRP筋将在暴露于正常和加速条件后进行检查，以测量其层间和横向剪切强度。将未暴露和预暴露的FRP筋浇注在混凝土梁和混凝土块中，以测量暴露退化对混凝土结构中FRP筋的粘结和弯曲性能的影响。树脂样品将分别进行浇铸、暴露和测试，以观察在拉伸和剪切测试后直接暴露于纯树脂样品的影响。暴露的类型将用于了解所用协议的加速效应，将通过比较直接暴露的FRP样品在碱性混合物中的降解效果，该碱性混合物复制混凝土的pH值和化学性质，但在高温下增加向复合材料的扩散。该项目的成果为建筑行业和可持续发展努力提供了广泛的好处：a.增强的基础设施耐久性：开发具有更好长期性能的FRP筋可以延长混凝土结构的使用寿命，从而降低维护成本并增强可持续性。b.推进净零建设：使用FRP筋加固的低碳混凝土与英国的净零排放目标无缝对接，使这项研究与可持续发展目标直接相关。全行业采用：新制定的加速协议可以在整个建筑行业中方便地采用，以评估FRP筋的耐久性，确保建筑项目的可靠性和安全性。本项目深入研究了纤维增强聚合物（FRP）筋作为建筑中传统钢筋的耐用替代品的前景，同时致力于更可持续和耐用的方法。