Analysis of Failure Modes in Fiber Reinforced Concrete Using X-ray Tomography and Digital Volume Correlation

Proceedings

Hall, Stephen¹  Flansbjer, Mathias²  Engqvist, Jonas³  Portal, Natalie Williams⁴ 

[1] Author to whom correspondence should be addressed.;Mechanics Research, RISE Research Institutes of Sweden, 50115 BorÃ¥s, Sweden;Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.;Solid Mechanics, Lund University, 221 00 Lund, Sweden

关键词: fiber reinforced concrete;    pull-out behavior;    X-ray Computed Tomography;    Digital Volume Correlation;   

DOI  :  10.3390/ICEM18-05238

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Pull-out mechanisms for different common steel fibers were investigated using adapted pull-out tests performed in-situ in an X-ray micro tomograph (µXRT). High-resolution volume images from the µXRT scans enable clear visualization of aggregates, pores, the fiber and the fiber-matrix interface. Furthermore, the natural density speckle pattern from aggregate distribution and pores was found suitable for Digital Volume Correlation (DVC) analysis. From the DVC results it was possible to visualize and quantify the strain distribution in the matrix around the fiber at the different load levels up to final failure, being marked by either pull-out or fiber rupture. This study demonstrates that strain measurements within the concrete matrix can be obtained successfully using µXRT imaging and DVC analysis, which leads to an increased understanding of the interaction mechanisms in fibre reinforced concrete under mechanical loading.

【 授权许可】

CC BY