Tensile characterization of Ultra-high performance fiber-reinforced concrete with digital images correlation

超高性能纤维增强混凝土的拉伸表征与数字图像相关

• 批准号: 533897-2018
• 负责人: Conciatori, David
• 金额: $ 1.82万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=647981
• 关键词: Tensile; characterization; Ultra; performance; fiber

Ultra-high performance fiber-reinforced concrete (UHPFRC) is an advanced cementitious composite that**exhibits superior mechanical properties compared to traditional or even high performance concrete (HPC).**Those mechanical properties, combined with an excellent durability, make UHPFRC a very interesting choice**for the rehabilitation of existing concrete structures as well as the development of slim and lightweight**concrete structures. Tensile characterization of UHPFRC is mostly made with the use of an indirect tensile test.**The results are then either directly used to classify the material according to the different standards or**post-processing is needed to convert the raw data into a coherent law. Some direct tensile tests (DTT) are**proposed for UHPFRC characterization. The use of direct tensile test allows the direct characterization of the**tensile law of the material without having to correct the data, which is needed with an indirect test. However,**the setup required to perform those tests are complex and, even in the best conditions, results vary largely from**different samples of the same material. This research project focuses on the development of a state-of-the-art**direct tensile test (DTT) for the tensile characterization of UHPFRC or any other fiber-reinforced cementitious**composites, such as the engineered cementitious composite (ECC) and the high-strength high-ductility**composites (HSHDC). The experimental setup will be mostly based on the latest DTT developed at the École**Polytechnique de Lausanne (EPFL). Digital images correlation will be used to capture the formation of micro**and macro cracks during the strain-hardening and strain-softening phases and will help enhance our**comprehension of this phenomenon.

超高性能纤维增强混凝土（UHPFRC）是一种先进的胶凝复合材料，与传统甚至高性能混凝土（HPC）相比，**具有优越的机械性能。**这些机械性能，加上优异的耐久性，使UHPFRC成为现有混凝土结构修复以及轻薄混凝土结构发展的一个非常有趣的选择**。UHPFRC的拉伸特性主要是通过间接拉伸试验进行的。**结果要么直接用于根据不同的标准对材料进行分类，要么需要进行后处理以将原始数据转换为连贯的规律。一些直接拉伸试验（DTT）被建议用于UHPFRC的表征。使用直接拉伸试验可以直接表征材料的拉伸规律，而无需纠正数据，这是间接试验所需要的。然而，进行这些测试所需的设置是复杂的，即使在最佳条件下，相同材料的不同样品的结果也有很大差异。该研究项目的重点是开发最先进的直接拉伸试验（DTT），用于UHPFRC或任何其他纤维增强胶凝复合材料的拉伸特性，如工程胶凝复合材料（ECC）和高强高塑性复合材料（HSHDC）。实验装置将主要基于École**洛桑理工学院（EPFL）开发的最新数字地面电视。数字图像关联将用于捕获在应变硬化和应变软化阶段微观和宏观裂纹的形成，并有助于增强我们对这一现象的理解。