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

基本信息

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

项目摘要

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) 是一种先进的水泥基复合材料，**与传统甚至高性能混凝土 (HPC) 相比，具有卓越的机械性能。**这些机械性能与出色的耐久性相结合，使 UHPFRC 成为对于现有混凝土结构的修复以及纤薄和轻质混凝土结构的开发来说，这是非常有趣的选择** UHPFRC 的拉伸特性主要是通过间接拉伸试验进行的。**结果为。然后，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，将原始数据转换为连贯的定律**建议使用一些直接拉伸测试（DTT）来进行直接表征。拉伸测试可以直接表征材料的拉伸定律，而无需校正数据，这是间接测试所需要的。但是，即使在最佳条件下，执行这些测试所需的设置也很复杂。，结果与**相同的不同样本有很大差异该研究项目的重点是开发最先进的**直接拉伸测试（DTT），用于 UHPFRC 或任何其他纤维增强水泥**复合材料的拉伸表征，例如工程水泥复合材料（ ECC）和高强度高延展性**复合材料（HSHDC）实验装置将主要基于洛桑理工学院开发的最新 DTT。（EPFL）数字图像相关性将用于捕获应变硬化和应变软化阶段微观和宏观裂纹的形成，并将有助于增强我们对这种现象的理解。