Author
Le Zhang
Bio: Le Zhang is an academic researcher. The author has contributed to research in topics: Ultimate tensile strength & Dynamic load testing. The author has an hindex of 2, co-authored 5 publications receiving 28 citations.
Papers
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TL;DR: In this paper, a coupled method based on statistical method and X-ray CT to extract indicators of subtle changes in gray value changes in the original number matrix of CT image is proposed.
26 citations
TL;DR: In this paper, an improved differential box counting (IDBC) method was proposed to calculate the fractal dimension of the CT images, which could describe the entire damage process of concrete.
26 citations
TL;DR: In this paper, a comparative study on the meso-scale damage evolution of concrete specimens was conducted through coupling concrete CT test and digital image analysis technology to investigate the deterioration properties of concrete material under static and dynamic tensile loading.
8 citations
TL;DR: In this paper, a series of CT tests were carried out on the damage process of concrete under tensile and compression loads, and CT images of the whole process of the concrete failure were obtained.
8 citations
TL;DR: Wang et al. as discussed by the authors extracted effective and discriminative meso-scale damage evolution information from concrete CT test results and proposed a new zoning method for concrete mesoscale damage by analyzing the change characteristics of CT number in CT images with different stress stages.
8 citations
Cited by
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TL;DR: In this paper , the influence of the magnesium-phosphorus molar (M/P) ratio and water-to-binder (W/B) ratio on the hydration product is explored by the thermodynamic simulation.
Abstract: Magnesium phosphate cement (MPC) paste is hardened by the acid–base reaction between magnesium oxide and phosphate. This work collects and evaluates the thermodynamic data at 25 ℃ and a pressure of 0.1 MPa and establishes the hydration reaction model of MPC pastes. The influence of the magnesium–phosphorus molar (M/P) ratio and water-to-binder (W/B) ratio on the hydration product is explored by the thermodynamic simulation. Following this, the initial and ultimate states of the hydration state of MPC pastes are visualized, and the porosity of different pastes as well as fractal analysis are presented. The result shows that a small M/P ratio is beneficial for the formation of main hydration products. The boric acid acts as a retarder, has a significant effect on lowering the pH of the paste, and slows down the formation of hydration products. After the porosity comparison, it can be concluded that the decreasing of M/P and W/B ratios helps reduce porosity. In addition, the fractal dimension Df of MPC pastes is positively proportional to the porosity, and small M/P ratios as well as small W/B ratios are beneficial for reducing the Df of MKPC pastes.
48 citations
TL;DR: In this article, an embedded PZT-based sensor for monitoring internal damage in concrete is presented, which produces controlled increments in levels of stress and damage in the concrete using digital image correlation.
29 citations
TL;DR: In this paper, the authors used grey-level co-occurrence matrices (GLCM) to analyze the internal damage in magnesium oxychloride cement concrete due to rust expansion and showed that there is a significant exponential relationship between the surface crack formation and the internal volume growth of the specimen.
27 citations
TL;DR: This paper explored the application of statistical time features extracted from raw vibration signals of truss-type bridges under dynamic excitation for assessing their health condition and showed that the proposal can identify damage from an incipient damage condition.
24 citations
TL;DR: In this paper, Mask R-CNN is applied to segment the images obtained from the real-time CT test under static uniaxial compression to identify voids and cracks in the CT images.
21 citations