Analysis of moisture damage susceptibility of warm mix asphalt (WMA) mixtures based on Dynamic Mechanical Analyzer (DMA) testing and a fracture mechanics model

Caro, Silvia; Beltrán, Diana P.; Álvarez, Allex E.; Estakhri, Cindy

doi:10.1016/j.conbuildmat.2012.04.035

Cited by 52 publications

(23 citation statements)

References 21 publications

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“…This indicates that after the addition of organic additives, moisture damage can be more severe. In fact, previous studies have shown that asphalt mixes containing organic additives have a greater moisture susceptibility than the conventional asphalt mix [30]. This is due to the hydrophobic characteristics of organic additives.…”

Section: Adhesion Of Asphalt-aggregatementioning

confidence: 91%

Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method

Yao

Liu

et al. 2017

Applied Sciences

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Abstract:The influence of organic additives (Sasobit and RH) and water on the adhesion of the asphalt-aggregate interface was studied according to the surface free energy theory. Two asphalt binders (SK-70 and SK-90), and two aggregate types (limestone and basalt) were used in this study. The sessile drop method was employed to test surface free energy components of asphalt, organic additives and aggregates. The adhesion models of the asphalt-aggregate interface in dry and wet conditions were established, and the adhesion work was calculated subsequently. The energy ratios were built to evaluate the effect of organic additives and water on the adhesiveness of the asphalt-aggregate interface. The results indicate that the addition of organic additives can enhance the adhesion of the asphalt-aggregate interface in dry conditions, because organic additives reduced the surface free energy of asphalt. However, the organic additives have hydrophobic characteristics and are sensitive to water. As a result, the adhesiveness of the asphalt-aggregate interface of the asphalt containing organic additives in wet conditions sharply decreased due to water damage to asphalt and organic additives. Furthermore, the compatibility of asphalt, aggregate with organic additive was noted and discussed.

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Section: Adhesion Of Asphalt-aggregatementioning

confidence: 91%

Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method

Yao

Liu

et al. 2017

Applied Sciences

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“…The model has also been successfully applied to evaluate moisture damage in these fine (Caro et al, 2012(Caro et al, , 2008Gudipudi & Underwood, 2015;Tong et al, 2013Tong et al, , 2015. The model is based on the cumulative fatigue-related damage that the asphalt mixture experiences throughout its service life.…”

Section: Analytical Non-linear Viscoelastic Model For Characterising mentioning

confidence: 99%

“…Information from this test was used to: (1) identify thresholds at which the material transits from a non-linear response to a damage zone -which provides the GR value included in Equation 6 -that is specific for each mixture, and (2) to define a threshold strain level that was able to generate damage in the material for further fatigue characterisation. (Caro et al, 2012, 2006Montepara et al, 2011) and it consists of applying a cyclic loading condition under a constant shear . However, within the 4 hours tests, the RAP materials did not exhibit full failure, so the parameter Nf was replaced by the number of cycles at which G* decreased a certain amount.…”

Section: δR(n) In Equationmentioning

confidence: 99%

“…linear and non-linear), and the mechanical deterioration processes under cyclic loading (i.e. fatigue test) of FAM materials (Caro et al, 2012(Caro et al, , 2008Caro, Sánchez, & Caicedo, 2014;Gudipudi & Underwood, 2015;Masad et al, 2008, 2006, Tong, Luo, & Lytton, 2013. The general procedure consists on using a rheometer with a special solid fixture configuration to conduct shear controlled strain tests on the small cylindrical FAM specimens.…”

Section: Experimental Set-up and Sample Preparationmentioning

confidence: 99%

“…FAM is usually defined as the combination of bitumen with the finest portion of the aggregates (e.g. particles size smaller than 1.18 mm) which are found in the entire asphalt mixture and have a relatively more uniform internal structure compared to the HMA (Caro, Beltrán, Alvarez, & Estakhri, 2012;Caro, Masad, Airey, Bhasin, & Little, 2008;Masad, Castelo Branco, Little, & Lytton, 2008). There is only one study on RAP mixtures that has been conducted by testing these FAM materials (He, Alavi, Jones, & Harvey, 2016); however, the study of this material is particular relevant since it is considered that most damage processes in HMA, especially those related to fatigue cracking and moisture damage, initiates and propagates through this fine matrix (Montepara, Romeo, Isola, & Tebaldi, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the degradation of fine asphalt-aggregate mixtures containing high reclaimed asphalt pavement contents

Sánchez

Grenfell

Airey

et al. 2017

Road Materials and Pavement Design

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This paper evaluates the mechanical properties and performance of the Fine Aggregate Matrix (FAM) existing within full RAP asphalt mixtures, in terms of their rheological and fatigue deterioration properties. The RAP material was produced in the laboratory to control its properties and to reduce the effects of variability associated with these materials. Four FAM mixtures were analysed, including a virgin HMA, a 100%RAP and two mixtures containing 50% RAP in combination with virgin materials using different penetration grade virgin binders.The analysis of the deterioration properties was based on the application of a fracture model that incorporates the viscoelastic properties of the material, the quality of the adhesive bonds developed between the aggregates and the corresponding bitumen present in each mixture, and the rate at which the material dissipates energy when subjected to cycling loading. The input parameters for this model include the results obtained from Dynamic Mechanical Analysis (DMA) and Surface Free Energy (SFE) tests. In general, the results showed that the incorporation of 50%RAP content increased the stiffness of the final mixtures, as expected. However, this hardening effect did not result in mixtures with inferior fatigue performance of the FAM present in the full mixtures, at the applied strain level.

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Use of Polymer Nanocomposites in Asphalt Binder Modification

Gulzar

Underwood

2019

Advanced Functional Textiles and Polymers

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Analysis of moisture damage susceptibility of warm mix asphalt (WMA) mixtures based on Dynamic Mechanical Analyzer (DMA) testing and a fracture mechanics model

Cited by 52 publications

References 21 publications

Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method

Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method

Evaluation of the degradation of fine asphalt-aggregate mixtures containing high reclaimed asphalt pavement contents

Use of Polymer Nanocomposites in Asphalt Binder Modification

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