Effect of particle mobility on aggregate structure formation in asphalt mixtures

Sefidmazgi, Nima Roohi; Teymourpour, Pouya; Bahia, Hussain U.

doi:10.1080/14680629.2013.812844

Cited by 35 publications

(10 citation statements)

References 9 publications

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“…This effect has been obtained with or without combination of SBS. Previous studies showed that mixtures with more contact points and/or contact length exhibit better performance in terms of rutting, thermal and fatigue cracking and therefore a mixture with better aggregate packing is more favorable [7,8,4]. Figure 5 confirms the correlation with wheel tracking results (R 2 =0.88) where mixtures with better aggregate packing were shown to have higher resistance to permanent deformation.…”

Section: Aggregate Internal Structuresupporting

confidence: 75%

Use of plastomeric additives to improve mechanical performance of warm mix asphalt

Lecomte¹,

Hacker²,

Teymourpour³

et al. 2016

Proceedings of 6th Eurasphalt &Amp; Eurobitume Congress

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A number of asphalt modifiers are known to improve the engineering characteristics of asphalt mixtures. However, asphalt mixtures produced with Polymer Modified Bitumen (PMB) are sometimes difficult to handle, and in many cases need higher mixing and compaction temperatures whereas the asphalt industry strives to reduce these temperatures in order to decrease energy consumption and harmful emissions of typically used Hot Mix Asphalts (HMA). This paper investigates if plastomeric materials (or a combination of elastomeric and plastomeric materials) can lead to better mechanical properties while reducing the processing temperatures. It shows that some low molecular weight poly-olefins having low viscosities above their melting point can act as processing aids and change the initial/inherent aggregate structure of the mixture (i.e., aggregates' packing) during compaction. This effect has been obtained with or without combination of elastomeric modifiers. The improved aggregate packing observed using image analysis tool ("iPas2") has a significant impact on performance-related properties like rutting resistance and complex modulus. Moreover, when the oxidized poly-olefins are used in the PMB, the polymer modified mixture appeared to be less sensitive to moisture damage as measured in water boiling tests and in modified Lottman test (ITSR).

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Section: Aggregate Internal Structuresupporting

confidence: 75%

Use of plastomeric additives to improve mechanical performance of warm mix asphalt

Lecomte¹,

Hacker²,

Teymourpour³

et al. 2016

Proceedings of 6th Eurasphalt &Amp; Eurobitume Congress

Self Cite

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“…Dai et al [ 56 ] used DIP analysis to provide detailed information of asphalt mixture for Finite Element simulations of Indirect Tensile (IDT) strength test [ 57 ]. Kose et al [ 58 ] and Partl et al [ 59 ] and, more recently, other authors [ 60 , 61 , 62 ] have proposed advanced DIP techniques, and threshold algorithms for aggregate, asphalt mastic and air voids segmentation using RGB (Red-Green-Blue) scanned and gray scale converted asphalt mixture images. In some of these studies, the analysis of the materials microstructure was extended to a three-dimensional investigation based on 3D X-Ray Computer Tomography (CT) technology.…”

Section: Microstructural Analysismentioning

confidence: 99%

Microstructural Analysis and Rheological Modeling of Asphalt Mixtures Containing Recycled Asphalt Materials

2014

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The use of recycled materials in pavement construction has seen, over the years, a significant increase closely associated with substantial economic and environmental benefits. During the past decades, many transportation agencies have evaluated the effect of adding Reclaimed Asphalt Pavement (RAP), and, more recently, Recycled Asphalt Shingles (RAS) on the performance of asphalt pavement, while limits were proposed on the amount of recycled materials which can be used. In this paper, the effect of adding RAP and RAS on the microstructural and low temperature properties of asphalt mixtures is investigated using digital image processing (DIP) and modeling of rheological data obtained with the Bending Beam Rheometer (BBR). Detailed information on the internal microstructure of asphalt mixtures is acquired based on digital images of small beam specimens and numerical estimations of spatial correlation functions. It is found that RAP increases the autocorrelation length (ACL) of the spatial distribution of aggregates, asphalt mastic and air voids phases, while an opposite trend is observed when RAS is included. Analogical and semi empirical models are used to back-calculate binder creep stiffness from mixture experimental data. Differences between back-calculated results and experimental data suggest limited or partial blending between new and aged binder.

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“…DIP analysis was also used to investigate the 3D distribution and interaction of aggregates, asphalt mastics (and binder) and air voids in asphalt mixtures in conjunction with 3D X-Ray Computer Tomography (CT) technology (Masad et al, 2002;Partl et al, 2007;Sefidmazgi et al, 2013). Recently, Zelelew et al (2013) introduced advanced DIP analysis procedures and threshold algorithms for aggregate, asphalt mastic and air voids using grey scale converted asphalt mixture images.…”

Section: Introductionmentioning

confidence: 99%

Microstructural investigation of Hot Mix Asphalt (HMA) mixtures using Digital Image Processing (DIP)

Moon

Falchetto

2015

KSCE J Civ Eng

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It is well known that Nominal Maximum Aggregate Size (NMAS) significantly affects several mechanical properties of asphalt pavement layers both at low and high temperatures. Two different aggregate NMAS, 9.5 mm and 12.5 mm, are commonly used for surface layer mixture. Most of the past research studies investigated the effect of different aggregate NMAS on asphalt mixture properties through experimental testing, while the impact of NMAS on asphalt mixtures microstructure has received little attention. In this paper, asphalt mixtures with two NMAS, 9.5 mm or 12.5 mm, two air voids percentages, 4% and 7%, and two binder contents, 4% and 7%, were prepared. Then, the effect of aggregate NMAS on materials properties was investigated by performing low temperature creep test of asphalt mixture through the Bending Beam Rheometer (BBR) and advanced Digital Image Processing (DIP) analysis of two-dimensional images of asphalt mixture combined with numerical evaluations of 2-and 3-point correlation functions. As a result, asphalt mixtures containing smaller NMAS showed higher stiffness compared to those prepared with larger aggregates at low temperature. The spatial distributions of aggregates, asphalt mastic, and air voids were not significantly affected by the addition of aggregates with different NMAS. However, an increase in Auto Correlation Length (ACL) was observed for asphalt mixtures having smaller NMAS, which suggests that low temperature creep properties are associated to ACL.

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Effect of particle mobility on aggregate structure formation in asphalt mixtures

Cited by 35 publications

References 9 publications

Use of plastomeric additives to improve mechanical performance of warm mix asphalt

Use of plastomeric additives to improve mechanical performance of warm mix asphalt

Microstructural Analysis and Rheological Modeling of Asphalt Mixtures Containing Recycled Asphalt Materials

Microstructural investigation of Hot Mix Asphalt (HMA) mixtures using Digital Image Processing (DIP)

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