Author: Jeremy McGahan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The physical characteristics of aggregates (form, angularity, and texture) are known to affect the performance of hot mix asphalt (HMA) pavements. Efforts to develop relationships between these aggregate characteristics and aggregate performance in HMA pavements have been limited in the past due to inherent inaccuracies in the methods used to measure these characteristics. The recently developed Aggregate Imaging System (AIMS) offers an opportunity to accurately measure aggregate shape characteristics allowing them to be properly related to asphalt performance. This research focused on relating the aggregate characteristics of form, angularity, and texture measured using AIMS to laboratory performance measurements on a wide variety of HMA mixes. The performance of these mixes was evaluated in three projects carried out by the Federal Highway Administration (FHWA) and theTexas Transportation Institute (TTI). During this research, a database of the volumetric, performance, and aggregate shape measurements for mixes used in these projects was created. Statistical analysis was conducted to correlate HMA performance parameters to volumetric and aggregate shape characteristics. The results show the dominant effect that aggregate shape properties have on HMA performance.
Author: Brian D. Prowell
Publisher: Transportation Research Board
ISBN: 0309088259
Category : Technology & Engineering
Languages : en
Pages : 101
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Book Description
Author: T. Fletcher
Publisher:
ISBN:
Category : Aggregate
Languages : en
Pages : 8
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Book Description
Aggregate shape has a significant effect on the performance of asphalt mixes. Designing well-performing asphalt pavements requires developing methods to quantify rapidly and accurately the different aggregate shape properties, and most importantly, relate these properties to performance. Aggregate texture has been identified in several studies to be the shape property that has the most significant influence on asphalt mix performance. This study presents a new procedure for measuring aggregate texture using image analysis techniques. The main advantages of this new procedure are the ability to capture the different sizes of texture elements, to separate the true texture from the color variations on the aggregate surface, and to characterize both fine and coarse aggregates. The procedure is used to measure texture for a wide range of fine and coarse aggregates, and the results are compared with the laboratory performance of asphalt mixes. The analysis shows that the procedure yields detailed information on aggregate texture in a short time. The texture measurements have very good correlation with the resistance of asphalt mixes to permanent deformation measured in the laboratory using different wheel tracking devices.
Author: Thomas D. White
Publisher: ASTM International
ISBN: 9780803128927
Category : Technology & Engineering
Languages : en
Pages : 210
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Book Description
Containing 13 papers from the December 2000 conference in Orlando, Florida, this book covers the use of the PURWheel laboratory tracking device, the Asphalt Pavement Analyzer, the identification of aggregate role, the evaluation of sensitivity, fine aggregate angularity, guidelines for the selection
Author: Prithvi S. Kandhal
Publisher: Transportation Research Board
ISBN: 9780309062596
Category : Technology & Engineering
Languages : en
Pages : 116
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Book Description
Author: E. Tutumluer
Publisher:
ISBN: 9780309390453
Category : Aggregates (Building materials)
Languages : en
Pages : 92
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Book Description
Author: J-S Chen
Publisher:
ISBN:
Category : Aggregate gradation
Languages : en
Pages : 7
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Book Description
This paper is aimed at quantifying coarse aggregate shape in an efficient manner and relating aggregate characteristics to mix properties. Digital image analysis was used to evaluate aggregate characteristics such as elongation, flatness, and other shape indices. The following particle shapes were selected for this study: cubical, rod, disk, and blade. Data showed that the morphological characteristics of coarse aggregate correlated well with the results of other indirect tests such as the particle index. Cubical particles possessed the best rutting resistance over the other shapes. Flaky and/or elongated aggregate in a mixture resulted in a lower resistance to shear deformation. The morphological characteristics of coarse aggregates found from image analysis were in good agreement with the engineering properties of hot-mix asphalt (HMA) mixtures. This paper presents a precise method to evaluate the aggregate characteristics in an HMA mix and demonstrates their effects on pavement performance.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 306
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Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author: Rajni Sukhwani
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 40
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Book Description
The focus of this project is on the evaluation of the sensitivity of HMA performance to aggregate properties measured using conventional and image analysis methods. Wavelet image analysis is used to measure texture. Image analysis methods based on the changes in the gradient on a particle boundary, and the difference between a particle radius in a certain direction and that of an equivalent ellipse are used to quantify angularity. Form is quantified by a method that evaluates the changes in particle radii with a fixed incremental change in the central angle. Researchers measured the performance of HMA mixes with different aggregates using the asphalt pavement analyzer (APA), Hamburg wheel tracking device (HW), and dynamic modulus test (DM).
Author: Eliana del Vivar
Publisher:
ISBN: 9781622601790
Category :
Languages : en
Pages :
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