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Journal ArticleDOI

Digital Image Correlation Technique for Measurement of Surface Strains in Reinforced Asphalt Concrete Beams under Fatigue Loading

01 Aug 2019-Journal of Materials in Civil Engineering (American Society of Civil Engineers (ASCE))-Vol. 31, Iss: 8, pp 04019135
Abstract: Geosynthetic products are routinely used to reinforce pavement overlays to control crack propagation under repeated vehicular and varying thermal loads. Many experimental methods are availa...

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Topics: Asphalt concrete (56%)
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Journal ArticleDOI
Abstract: Semi-flexible pavement (SFP) is a new pavement technology consisting of open-graded asphalt concrete with a high air void content filled by injecting special grouting materials. The SFP is constructed without expansion, contraction, and construction joints and also demonstrates prominent rutting and shoving/corrugation resistances. These new pavement materials simultaneously possess flexible characteristics of asphalt pavements and the high strength (hardness) of concrete pavements. The main purpose of this study is to provide comprehensive review on design, construction, and performance of semi-flexible pavements based on laboratory and field scales evaluation. The first part of this paper presents the introduction of semi-flexible pavement, its design approach, and laboratory-scale preparation. In the second part, a performance evaluation of semi-flexible pavement under traffic loading, resistance to fuel, oil spillage, and its durability are discussed. In the last part, the field evaluation method and existing challenges are investigated. The review of the previous studies indicated that SFP is recognized as an alternative to asphalt and concrete pavements due to its remarkable features and mechanical performance.

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18 citations


Journal ArticleDOI
Kareem Mostafa1, Tarek Hegazy1Institutions (1)
TL;DR: The state-of-the-art in Image-based analysis techniques and their applications in construction is explored, including integrating object detection with quantification and sizing techniques to develop more comprehensive applications.

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Abstract: Image-based analysis techniques offer a robust way to solve engineering problems due to the availability of visual data (e.g., surveillance cameras). Hence, research efforts have focused on applying Image-based techniques in the construction industry to improve the safety and productivity of construction operations as well as the resilience and sustainability of the construction assets. This paper explores the state-of-the-art in Image-based analysis techniques and their applications in construction. Over 100 journal papers were retrieved from the Scopus database for an in-depth review of major applications, benefits, and areas of future research potential. Accordingly, Three main research directions were identified that utilize image-based technologies: (1) construction safety; (2) progress monitoring; and (3) damage assessment. It is observed that most research efforts focused on object detection (e.g., hardhats, defects) for safety inspection and repair planning. Potential future developments include integrating object detection with quantification and sizing techniques to develop more comprehensive applications.

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7 citations


Journal ArticleDOI
Nutan Shukla1, M. K. Mishra1Institutions (1)
Abstract: Efficient execution of the underground coal extraction depends on the accuracy of deformation measurement of the pillars. The basic design information as stress-strain behavior is collected from the laboratory investigation. Contact-based deformation measurement approaches have limitations like data insufficiency, proneness to signal loss, physical damage, etc. In this investigation, a contactless technique like digital image correlation (DIC) has been evaluated for its applicability on coal specimen. Coal specimens from 100-m depth have been investigated for their stress-strain behavior through DIC as well as other conventional methods, i.e., strain gauge and linear variable differential transformer (LVDT). The deformation was found out from a set of images recorded and analyzed using the software StrainMaster. In the image analysis, the optimum subset size was found to be 99 × 99 pixels with a step size of 8 pixels. The average threshold stress levels of crack initiation and crack damage in uniaxial compression were observed to be 43.72% and 63.6%, respectively. DIC exhibits higher sensitivity to deformation of coal as compared to that by LVDT and strain gauges and proven to be a promising and dependable technique for coal pillar analysis.

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3 citations




References
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Journal ArticleDOI
Michael A. Sutton1, WJ Wolters1, W. H. Peters1, W. F. Ranson1  +1 moreInstitutions (1)
TL;DR: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object.

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Abstract: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object. The deformations are determined by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object. The improved numerical correlation scheme is discussed in detail. The displacements of a simple object, as computed by the correlation routine, are shown to agree with theoretical calculations.

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1,648 citations


Journal ArticleDOI
W. H. Peters1, W. F. Ranson1Institutions (1)
Abstract: Digital imaging techniques are utilized as a measure of surface displacement components in laser speckle metrology. An image scanner which is interfaced to a computer records and stores in memory the laser speckle patterns of an object in a reference and deformed configuration. Subsets of the deformed images are numerically correlated with the references as a measure of surface displacements. Discrete values are determined around a closed contour for plane problems which then become input into a boundary integral equation method in order to calculate surface traction in the contour. Stresses are then calculated within this boundary. The solution procedure is illustrated by a numerical example of a case of uniform tension.

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1,416 citations


Journal ArticleDOI
01 Sep 2003-Geotechnique
Abstract: A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing. In this paper, the theory underlying this system is described, and the performance is validated. Digital photography is used to capture images of planar soil deformation. Using PIV, the movement of a fine mesh of soil patches is measured to a high precision. Since PIV operates on the image texture, intrusive target markers need not be installed in the observed soil. The resulting displacement vectors are converted from image space to object space using a photogrammetric transformation. A series of validation experiments are reported. These demonstrate that the precision, accuracy and resolution of the system are an order of magnitude higher than previous image-based deformation methods, and are comparable to local instrumentation used in element testing. This performance is achieved concurrent with an order of magnitude increase in the number of meas...

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1,088 citations


Journal ArticleDOI
01 Aug 2001-Geotechnique
Abstract: The underlying mechanisms governing the behaviour of displacement piles in sand are not well understood, leading to unreliability in design methods. A series of plane-strain calibration chamber tes...

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228 citations


Journal ArticleDOI
TL;DR: The updated approach combines a range of advances in image analysis algorithms and techniques best suited to geotechnical applications and achieves an improvement by at least a factor of 10 in measurement precision relative to the most commonly used particle image velocimetry (PIV) approach.

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Abstract: This paper describes and benchmarks a new implementation of image-based deformation measurement for geotechnical applications. The updated approach combines a range of advances in image analysis al...

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191 citations