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Article

Effect of Loading Rate on Tensile and Failure Behavior of Concrete

1
College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
2
College of Mechanics and Materials, Hohai University, Nanjing 211100, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(21), 5994; https://doi.org/10.3390/s20215994
Received: 22 August 2020 / Revised: 19 October 2020 / Accepted: 20 October 2020 / Published: 22 October 2020
Three-point bending experiments of concrete beams were conducted under the strain rate range of 10−6 s−1 and 1.5 × 10−3 s−1. A novel 3D laser scanner, Handy SCAN, was employed to detect the areas of interface, mortar and aggregate on the crack surface after the experiment. In this paper, the inhomogeneity of materials and the inertial effect were considered as the main factors in the strength enhancement of concrete together with a proposed dynamic model. With the obtained experimental results, the initial elastic modulus and tensile strength of concrete showed obvious rate sensitivity. Moreover, an empirical relationship of dynamic increase factor and strain rate was established for the strain rate range of 10−6 s−1 and 1.5 × 10−3 s−1. The contributions of aggregate and inertia effect to the dynamic enhancement of concrete strength were quantified with respect to the loading rate. The rate effect of concrete obtained by the experiments was verified by the finite element analysis on the mesoscopic scale with the model built by the three-dimensional random aggregate software. View Full-Text
Keywords: concrete; strain rate; dynamic strength; dynamic increase factor; three point bending test concrete; strain rate; dynamic strength; dynamic increase factor; three point bending test
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MDPI and ACS Style

Chen, X.; Sun, L.; Zhao, W.; Zheng, Y. Effect of Loading Rate on Tensile and Failure Behavior of Concrete. Sensors 2020, 20, 5994. https://doi.org/10.3390/s20215994

AMA Style

Chen X, Sun L, Zhao W, Zheng Y. Effect of Loading Rate on Tensile and Failure Behavior of Concrete. Sensors. 2020; 20(21):5994. https://doi.org/10.3390/s20215994

Chicago/Turabian Style

Chen, Xiaocui, Liguo Sun, Wenhu Zhao, and Yuan Zheng. 2020. "Effect of Loading Rate on Tensile and Failure Behavior of Concrete" Sensors 20, no. 21: 5994. https://doi.org/10.3390/s20215994

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