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Gradation-based framework for asphalt mixture
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0002-0596-228X
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-0889-6078
2013 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 46, no 8, 1401-1414 p.Article in journal (Refereed) Published
Abstract [en]

Aggregates are the major component of asphalt mixtures, greatly influencing the mixtures resistance to failure. The structure that is formed by the aggregates will depend mostly on the size distribution, shape and mineral composition. Coarse aggregate have a strong influence on the resistance to rutting, while fines provide stability to the mixture. In the present study a generalized framework is developed to identify the range of aggregate sizes which form the load carrying structure in hot mix asphalt and determine its quality. The method has been developed as a numerical procedure based on packing theory. Parameters like porosity and coordination number have been used to evaluate the quality of the load carrying structure and relate it to resistance to rutting. The framework has been evaluated on several field and laboratory mixtures and related to their rutting performance. The gradation analysis of the mixtures has compared favorably with the performances reported from the field and laboratory testing. The developed gradation analysis framework has proven to be a tool to identify those mixtures with a poor rutting performance based on the gradation of the aggregates.

Place, publisher, year, edition, pages
2013. Vol. 46, no 8, 1401-1414 p.
Keyword [en]
Hot mix asphalt, Gradation analysis, Porosity, Packing theory, Rutting
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-98420DOI: 10.1617/s11527-012-9982-3ISI: 000322493800015Scopus ID: 2-s2.0-84881226730OAI: oai:DiVA.org:kth-98420DiVA: diva2:537207
Note

QC 20130823. Updated from submitted to published.

Available from: 2012-06-26 Created: 2012-06-26 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Gradation-Based Framework for Asphalt Mixtures
Open this publication in new window or tab >>Gradation-Based Framework for Asphalt Mixtures
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Asphalt mixture microstructure is formed by aggregates, bitumen binder and air voids. Aggregates make for up to 90% of the mixtures volume and the structure formed by them will depend mostly on their size distribution and shape. The study presented in this thesis has as main objective to develop a framework that allows the characterization of asphalt mixtures based on the aggregates gradation and its impact on pavement performance. Moreover, the study aims to identify the range of aggregate sizes which form the load carrying structure, called Primary Structure, and determine its quality.

The method has been developed as a numerical procedure based on packing theory of spheres. Parameters like porosity, coordination number and disruption factor of the Primary Structure; and a binder distribution parameter for the different sub-structures have been used to evaluate the quality of the load carrying structure and predict the impact on several failure modes. The distribution of bitumen binder has been derived from a geometrical model which relates porosity of the mixture with film thickness of particles considering the overlapping reduction as the film grows. The model obtained is a closer approximation to a physical characteristic of the compacted mixture separated according to different elements of the structure.

The framework has been evaluated on several field and laboratory mixtures and predictions have been made about their rutting performance and moisture resistance. The calculated parameters have compared favourably with the performances reported from the field and laboratory testing. The developed gradation analysis framework has proven to be a tool to identify those mixtures with a poor rutting performance based on the gradation of the aggregates.

The Gradation - Based Framework has satisfactory distinguished between good and bad performance of asphalt mixtures when related to permanent deformation and moisture damage. The calculated parameters have allowed identifying and understanding the main mechanisms and variables involved in permanent deformation and moisture damage of asphalt mixtures. The developed model can be used as a tool to determine the optimal gradation to assure good performance for hot mix asphalt pavements.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. vii, 18 p.
Series
Trita-TEC-LIC, ISSN 1653-445X ; 12:001
Keyword
Asphalt, aggregate gradation, packing theory, asphalt microstructure, porosity, film thickness, rutting, moisture damage.
National Category
Infrastructure Engineering
Research subject
SRA - Transport
Identifiers
urn:nbn:se:kth:diva-95449 (URN)978-91-85539-81-9 (ISBN)
Presentation
2012-04-20, B25, Brinellvägen 23, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20120626Available from: 2012-06-26 Created: 2012-05-25 Last updated: 2012-06-26Bibliographically approved

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Jelagin, DenisBirgisson, Björn

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