Binder distribution model for asphalt mixtures based on packing of the primary structure

Lira, Bernardita; Jelagin, Denis; Birgisson, Björn

doi:10.1080/10298436.2014.937713

Cited by 14 publications

(2 citation statements)

References 12 publications

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“…The gradation-based framework developed in this study defines a primary and a secondary aggregate structure, respectively, and identifies these structures in asphalt mixtures given the particle size distribution. Furthermore, the gradation-based framework was used by Das, Birgisson, Jelagin, and Kringos (2013) to investigate the relationship between coating thickness of the primary structure (Lira, Jelagin, & Birgisson, 2015) and the ageing characteristics of an asphalt mixture. The authors observed a direct correlation between primary structure coating thickness and age hardening of asphalt mixtures.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of asphalt rutting based on mixture aggregate gradation

Lira

Ekblad

Lundström

2019

Road Materials and Pavement Design

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Aggregate gradation is fundamental concerning asphalt pavement response to loading, especially regarding resistance to permanent deformation. This study assess, in an empirical way, the capability of a gradation-based framework to evaluate the susceptibility to permanent deformation of asphalt mixtures with varying aggregate gradation. The laboratory study was planned to isolate the effect of aggregate gradation by keeping the source of both the aggregates and the binder constant. The work consisted of testing six different asphalt mixtures with varying aggregate gradations using two different methods: wheel tracking and cyclic compression test. Results show that the testing method influences the asphalt mixtures response to loading. The combined normalised result shows a non-significant relationship between the gradation-based framework parameters and resistance to permanent deformation. Additionally, it was observed that the total amount of coarse material have an influence on mixture resistance to permanent deformation.

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Section: Introductionmentioning

confidence: 99%

Evaluation of asphalt rutting based on mixture aggregate gradation

Lira

Ekblad

Lundström

2019

Road Materials and Pavement Design

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“…As stated above this assumption is made here for simplicity and more realistic binder phase distribution models, such as e.g. (Lira, Jelagin, & Birgisson, 2015) will be incorporated as a part of future studies. 4π 3…”

Section: Geometrymentioning

confidence: 99%

New discrete element framework for modelling asphalt compaction

Olsson

Jelagin

Partl

2019

Road Materials and Pavement Design

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During asphalt mixture compaction, loads in the material are mainly transferred through contact between the stones and the interaction between the stones and the binder. The behaviour of such materials is suitable to model using the Discrete Element Method (DEM). In this study, a new DEM modelling approach has been developed for studying the asphalt compaction process, incorporating contact and damage laws based on granular mechanics. In the simulations, aggregate fracture is handled by a recently developed method of incorporating particle fracture in DEM, based on previously performed fracture experiments on granite specimens. The binder phase is modelled by adding a viscoelastic film around each DEM particle. This surface layer has a thickness that obtains the correct volume of the binder phase and has mechanical properties representative for the binder at different temperatures. The ability of the model to capture the influence of mixture parameters on the compactability and the eventual stone damage during compaction is examined for the cases of compaction flow test and gyratory compaction. Explicitly, the influence of different aggregate gradations, mixture temperatures and binder properties are studied. The results show that the proposed DEM approach is able to capture qualitatively and quantitatively responses in both cases and also provide predictions of aggregate damage. One large benefit with the developed modelling approach is that the influence of different asphalt mixture parameters could be studied without re-calibration of model parameters. Furthermore, based on comparative DEM simulations, it is shown that the proposed approach provides more realistic force distribution networks in the material.

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