American Society of Civil Engineers


Assessing the Polishing Characteristics of Coarse Aggregates Using Micro-Deval and Imaging System


by Wenjing Xue, (Graduate Research Student, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. E-mail: wenjingx@vt.edu), Cristian Druta, (Senior Research Associate, Virginia Tech Transportation Institute, Blacksburg, VA 24061. E-mail: cdruta1@vt.edu), Linbing Wang, M.ASCE, (Associate Professor, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. E-mail: wangl@vt.edu), and D. Stephen Lane, (Associate Principal Research Scientist, Virginia Transportation Research Council, Charlottesville, VA 22903. E-mail: stephen.lane@vdot.virginia.gov)
Section: Pavement Base Materials, pp. 288-295, (doi:  http://dx.doi.org/10.1061/41104(377)35)

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Conference Proceeding Paper
Part of: Paving Materials and Pavement Analysis
Abstract: Aggregates used in asphalt concrete should be tough and durable to withstand HMA production, transportation, construction, traffic loads and environmental effects. Aggregate morphology not only plays an important role in aggregates’ mechanical properties but also influences the asphalt pavement skid resistance. The Micro-Deval apparatus, which can evaluate aggregates’ hardness or wear resistance, was used for assessing the polishing resistance of aggregates. The abrasion testing in conjunction with image analysis for aggregate shape, angularity and texture, is the focus of this study. Aggregates from ten Virginia sources were used for the Micro-Deval abrasion and digital images of twenty five particles chosen from each source were captured with a regular camera and analyzed with the MATLAB-based program to characterize the particle morphology. Due to time constraints and material availability the aggregates that were analyzed before and after abrasion were not the same aggregates. With one exception (Nolichucky quartzite), all of the aggregates exhibited very good abrasion resistance after being tested in the Micro-Deval. Also, because some of the aggregates abraded differently their morphological parameters after abrasion were larger or equal to the parameters before abrasion.


ASCE Subject Headings:
Asphalts
Concrete
Aggregates
Virginia