Measurements of the moisture diffusion coefficient of asphalt mixtures and its relationship to mixture composition

Kassem, Emad; Masad, Eyad; Lytton, Robert L.; Bulut, Rifat

doi:10.1080/10298430802524792

Cited by 40 publications

(16 citation statements)

References 10 publications

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“…More details about X-ray CT and image analysis can be found in the literature [46,47]. By collecting and analyzing the X-ray CT data of the laboratory compacted asphalt mixture samples [48][49][50] and field asphalt pavement layer cores [51], the relationship between average air void radius and air void content is presented in Fig. 4.…”

Section: Average Air Voids Sizementioning

confidence: 99%

Crack initiation in asphalt mixtures under external compressive loads

Zhang¹,

Luo²,

Luo³

et al. 2014

Construction and Building Materials

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h i g h l i g h t sA crack initiation criterion is derived for asphalt mixtures in compression. Bond energy increases with aging and loading rate and decreases with temperature. Percentages of cohesive and adhesive cracking are determined for asphalt mixture. Compressive strength is predicted by simplified crack initiation criterion. a b s t r a c tCrack initiation was studied for asphalt mixtures under external compressive loads. High tensile localized stresses e direction of the external loads. A quantitative crack initiation criterion the edges of compressed air voids lead to the growth of wing cracks in thon was derived using pseudostrain energy balance principle. Bond energy is determined and it increases with aging and loading rate while decreases with temperature. Cohesive and adhesive cracking occur simultaneously and a method was proposed to determine the individual percentage. The crack initiation criterion is simplified and validated through comparing the predicted and measured compressive strength of the asphalt mixtures.

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Section: Average Air Voids Sizementioning

confidence: 99%

Crack initiation in asphalt mixtures under external compressive loads

Zhang¹,

Luo²,

Luo³

et al. 2014

Construction and Building Materials

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“…Several experimental efforts have been focused on quantifying the coefficient of moisture diffusion in different road materials (Kassem 2005, Kringos et al 2008a, Kassem et al 2009, Arambula et al 2010, Vasconcelos 2010, Hernández 2013. This information has been used by different authors as input parameters in numerical models of moisture diffusion in asphalt mixtures (Masad et al 2006, Arambula et al 2010, Caro et al 2010a, 2010b, and it will be used in this study to model water vapour diffusion within compacted asphalt courses.…”

Section: Introductionmentioning

confidence: 99%

Incorporating the heterogeneity of asphalt mixtures in flexible pavements subjected to moisture diffusion

Caro

Castillo

Masad

2015

International Journal of Pavement Engineering

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Moisture diffusion is one of the mechanisms by which water can reach the microstructure of asphalt mixtures and negatively affect their performance. In this work, a finite element model and computational simulations were used to study the response of asphalt pavement layers subjected to the coupled effects of moisture diffusion and mechanical loading. The model considered that the evolution of water-related diffusion processes in these materials is influenced by the microstructure of the mixture, particularly by the air void (AV) phase. Thus, a stochastic technique was used to incorporate the heterogeneity of the AV structure in compacted asphalt layers, which also permitted to account for the variability of the physical and mechanical properties that result from the heterogeneous void structure. The results demonstrate that moisture diffusion has a significant influence on the macromechanical response of asphalt pavement layers, especially during the initial months of service. In addition, the results clearly demonstrate that including the heterogeneity of material properties is valuable to quantify the uncertainty associated with these coupled processes.

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“…This phenomenon was identified in the 1930s (Caro et al 2008), and the reference literature calls it "stripping" (Caro et al 2008;Kringos et al 2008Kringos et al , 2008aKassem et al 2009). The causes that generate this phenomenon are complex because they involve physical, chemical, mechanical, and thermodynamic aspects.…”

Section: Resistance and Durabilitymentioning

confidence: 99%

A Review of Warm Mix Asphalt Technology: Technical, Eco-nomical and Enviromental Aspects

Quintana¹,

Hernández-Noguera²,

Reyes³

2015

ing.inv.

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In general terms, warm mix asphalt (WMA) technology has great potential for successful use in road works construction projects. However, concerns remain regarding the durability and behavior of WMA mixtures in the long term, which need to be addressed. This review focuses on the technical, economic and environmental advantages and disadvantages. The review concludes that the main advantageof this technology, at the moment, concerns the environment. At the end of this work, the authors include certain recommendations for future works in order to continue strengthening the development of WMA technology.Keywords: Warm mix asphalt, WMA, manufacturing, design, additives. RESUMENEn términos generales, la tecnología de mezcla asfáltica tibias (WMA por sus siglas en inglés) presenta un gran potencial para ser usada con éxito en proyectos de obras de construcción de obras viales. Sin embargo, aún existe preocupación en temas concernientes a la durabilidad y al comportamiento a largo de plazo de esta tecnología. Con base en una revisión bibliográfica, el artículo presenta los aspectos más importantes concernientes a la tecnología WMA. Se reportan las ventajas y desventajas técnicas, económicas y ambientales de utilizar esta tecnología reciente. Al final del documento los autores exponen algunas recomendaciones como apoyo para continuar fortaleciendo el desarrollo de la tecnología WMA.

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Measurements of the moisture diffusion coefficient of asphalt mixtures and its relationship to mixture composition

Cited by 40 publications

References 10 publications

Crack initiation in asphalt mixtures under external compressive loads

Crack initiation in asphalt mixtures under external compressive loads

Incorporating the heterogeneity of asphalt mixtures in flexible pavements subjected to moisture diffusion

A Review of Warm Mix Asphalt Technology: Technical, Eco-nomical and Enviromental Aspects

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