Video Image Analysis of Aggregates

Video Image Analysis of Aggregates PDF Author: E. Tutumluer
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 164

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Book Description
This study focused on evaluating performances of different video imaging systems, both commercially available and newly developed, for automating the determination of coarse aggregate (nominal size greater than 4.75 mm or No.4 sieve) size and shape properties, i.e., flat and elongated ratio, gradation, and angularity. These properties impacting performance of asphalt pavements were previously developed into a set of consensus properties to identify proper aggregates for SHRP Superpave asphalt concrete mix designs. A total of 10 bags of aggregate samples, primarily crushed gravel, limestone, and dolomite provided by the Illinois Department of Transportation (lDOT), were used to evaluate speed, precision, and accuracy of various image analysis techniques, specifically, (1) the digital image analysis technique proposed by Frost and Lai (1996); (2) the commercially available French video grader VDG 40; (3) the recent WipShape system at the University of Missouri-Rolla; and finally, (4) the new "University of Illinois (UI) Aggregate Image Analyzer." Based on the evaluation results, not all the properties, i.e., flat and elongated ratio, gradation, and angularity, could possibly be determined from one system. The new Ul Aggregate Image Analyzer was developed to provide one system for all properties, based on the use of 3 cameras for accurately reconstructing the three-dimensional shape, i.e., computing volume of an aggregate particle, and automating the determination of all the aforementioned properties. The Analyzer took approximately 70 minutes to test an entire bag of over 1000 particles using a Pentium II computer with a 350-MHz processor speed. The computed flat and elongated ratios in percentage by weight were in very good agreement with the results obtained by manual caliper at I DOT. The repeatability of the Ul lmage Analyzer results was also very good. The imaging based gradation curves were found to match very closely with the mechanical sieve analysis results. In addition, a new Angularity Index was developed to numerically quantify the shape of coarse aggregates analyzed using the Ul Aggregate Image Analyzer.

Video Image Analysis of Aggregates

Video Image Analysis of Aggregates PDF Author: E. Tutumluer
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 164

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Book Description
This study focused on evaluating performances of different video imaging systems, both commercially available and newly developed, for automating the determination of coarse aggregate (nominal size greater than 4.75 mm or No.4 sieve) size and shape properties, i.e., flat and elongated ratio, gradation, and angularity. These properties impacting performance of asphalt pavements were previously developed into a set of consensus properties to identify proper aggregates for SHRP Superpave asphalt concrete mix designs. A total of 10 bags of aggregate samples, primarily crushed gravel, limestone, and dolomite provided by the Illinois Department of Transportation (lDOT), were used to evaluate speed, precision, and accuracy of various image analysis techniques, specifically, (1) the digital image analysis technique proposed by Frost and Lai (1996); (2) the commercially available French video grader VDG 40; (3) the recent WipShape system at the University of Missouri-Rolla; and finally, (4) the new "University of Illinois (UI) Aggregate Image Analyzer." Based on the evaluation results, not all the properties, i.e., flat and elongated ratio, gradation, and angularity, could possibly be determined from one system. The new Ul Aggregate Image Analyzer was developed to provide one system for all properties, based on the use of 3 cameras for accurately reconstructing the three-dimensional shape, i.e., computing volume of an aggregate particle, and automating the determination of all the aforementioned properties. The Analyzer took approximately 70 minutes to test an entire bag of over 1000 particles using a Pentium II computer with a 350-MHz processor speed. The computed flat and elongated ratios in percentage by weight were in very good agreement with the results obtained by manual caliper at I DOT. The repeatability of the Ul lmage Analyzer results was also very good. The imaging based gradation curves were found to match very closely with the mechanical sieve analysis results. In addition, a new Angularity Index was developed to numerically quantify the shape of coarse aggregates analyzed using the Ul Aggregate Image Analyzer.

Test Methods for Characterizing Aggregate Shape, Texture, and Angularity

Test Methods for Characterizing Aggregate Shape, Texture, and Angularity PDF Author: Eyad Masad
Publisher: Transportation Research Board
ISBN: 0309098823
Category : Aggregates (Building materials)
Languages : en
Pages : 94

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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 555: Test Methods for Characterizing Aggregate Shape, Texture, and Angularity examines a methodology for classifying aggregates based on the distribution of shape, texture, and angularity characteristics. The report also explores a test method that it is appropriate for use in central and field laboratories, which measures shape, texture, and angularity characteristics of aggregates used in hot-mix asphalt, hydraulic cement concrete, and unbound base and subbase layers of pavements. Appendixes for the report were published as NCHRP Web-Only Document 80"--Publisher's description.

Advances in Transportation Geotechnics IV

Advances in Transportation Geotechnics IV PDF Author: Erol Tutumluer
Publisher: Springer Nature
ISBN: 3030772349
Category : Science
Languages : en
Pages : 976

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Book Description
This volume presents selected papers presented during the 4th International Conference on Transportation Geotechnics. The papers address the geotechnical challenges in design, construction, maintenance, monitoring, and upgrading of roads, railways, airfields, and harbor facilities and other ground transportation infrastructure with the goal of providing safe, economic, environmental, reliable and sustainable infrastructures. This volume will be of interest to postgraduate students, academics, researchers, and consultants working in the field of civil and transport infrastructure.

Aggregate Properties and the Performance of Superpave-designed Hot Mix Asphalt

Aggregate Properties and the Performance of Superpave-designed Hot Mix Asphalt PDF Author: Brian D. Prowell
Publisher: Transportation Research Board
ISBN: 0309088259
Category : Technology & Engineering
Languages : en
Pages : 101

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Book Description


Computational Methods and Experimental Measurements XVII

Computational Methods and Experimental Measurements XVII PDF Author: G.M. Carlomagno
Publisher: WIT Press
ISBN: 1845649222
Category : Mathematics
Languages : en
Pages : 565

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Book Description
Containing papers presented at the seventeenth in a series of biennial meetings organised by the Wessex Institute and first held in 1984, this book includes the latest research from scientists who perform experiments, researchers who develop computer codes, and those who carry out measurements on prototypes and whose work may interact. Progress in the engineering sciences is dependent on the orderly and concurrent development of all three fields. Continuous improvement in computer efficiency, coupled with diminishing costs and rapid development of numerical procedures have generated an ever-increasing expansion of computational simulations that permeate all fields of science and technology. As these procedures continue to grow in magnitude and complexity, it is essential to be certain of their reliability, i.e. to validate their results. This can be achieved by performing dedicated and accurate experiments. At the same time, current experimental techniques have become more complex and sophisticated so that they require the exploitation of computers, both for running experiments as well as acquiring and processing the resulting data. The papers contained in the book address advances in the interaction between these three areas. They cover such topics as: Computational and Experimental Methods; Fluid Flow; Structural and Stress Analysis; Materials Characterisation; Heat Transfer and Thermal Processes; Advances in Computational Methods; Automotive Applications; Applications in Industry; Process Simulations; Environmental Modelling and Applications; Computer Modelling; Validation of Computer Modelling; Computation in Measurements; Data Processing of Experiments; Virtual Testing and Verification; Simulation and Forecasting; Measurements in Engineering.

Coagulation and Flocculation

Coagulation and Flocculation PDF Author: Bohuslav Dobias
Publisher: CRC Press
ISBN: 9780585363059
Category : Science
Languages : en
Pages : 722

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Book Description
This volume details the thermodynamics and kinetics of the adsorption of surfactants and polymers on solids, as well as coagulation and flocculation mechanisms - demonstrating the applicability of the newest theoretical approaches on practical systems.;Written by over 15 international experts in the field, Coagulation and Flocculation: treats the Gouy-Chapman theory of an isolated planar charged surface and the DLVO theory describing the interaction between two identical charged surfaces; shows which energies are responsible for structure formation, what types of structure can be built in diluted and concentrated systems and how such structures can be studied and characterized; describes the interplay between interface and hydrodynamic forces and derives equations for calculating their individual probabilities; examines the use of microscopy, photography, individual particle sensors, sedimentation and light scattering to measure aggregate size distributions; and discusses methods for forming ceramics and the effects of improvements in powder packing and the stabilization of powder suspensions on processing steps.

Aggregate Contribution to Hot Mix Asphalt (HMA) Performance

Aggregate Contribution to Hot Mix Asphalt (HMA) Performance PDF Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 204

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Book Description


Advances in Transportation Geotechnics

Advances in Transportation Geotechnics PDF Author: Ed Ellis
Publisher: CRC Press
ISBN: 0203885945
Category : Technology & Engineering
Languages : en
Pages : 788

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Book Description
Highways provide the arteries of modern society. The interaction of road, rail and other transport infrastructure with the ground is unusually intimate, and thus needs to be well-understood to provide economic and reliable infrastructure for society. Challenges include not only the design of new infrastructure (often on problematic ground), but inc

Report

Report PDF Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 120

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Book Description


Innovations and Developments in Concrete Materials and Construction

Innovations and Developments in Concrete Materials and Construction PDF Author: Ravindra K. Dhir
Publisher: Thomas Telford
ISBN: 9780727731791
Category : Architecture
Languages : en
Pages : 1036

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Book Description
There is no substitute for concrete that can be used on the same engineering scale. Its sustainability, exploitation and further development are necessary for a healthy economy and environment worldwide. Concrete must keep evolving to satisfy the increasing demands of all its users.