Experimental investigation of the homogeneity of the blended binder of a high rate recycled asphalt

Eddhahak-Ouni, Anissa; Dony, Anne; Colin, Johan; Mendez, Samuel; Navaro, Julien; Drouadaine, Ivan; Bruneau, Denis

doi:10.1080/14680629.2012.700269

Cited by 42 publications

(8 citation statements)

References 5 publications

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“…Method M2 consists in solubilising the bitumen in a solvent, with subsequent dripping in the KBr cell, without any solvent evaporation prior to the FTIR analysis (Figure 3(b)). Method M2 was also used in Eddhahak-Ouni et al (2012) for the characterisation of different bituminous solutions.…”

Section: Comparison Of Methods (M1 and M2) For Sample Preparationmentioning

confidence: 99%

Characterisation of ageing processes on the asphalt mixture surface

Lopes

Zhao²,

Chailleux³

et al. 2014

Road Materials and Pavement Design

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Ageing of asphalt binders leads to evolution of pavements mechanical performances, due to changes in their rheological behaviour and in the binder composition. Ageing leads to a hardening of asphalt, mainly due to the oxidation of the asphalt binder itself. Oxidation rate is influenced by several parameters, namely outside temperature, ultraviolet (UV) radiation and intrinsic characteristics of the mixture constituents. In order to assess physical and chemical characteristics of the binders in aged pavements, mixture samples of several centimetres in thickness are usually cored from the field. Binders are extracted from these asphalt samples. This process of extraction is typical but it does not allow differentiating bulk and surface characteristics. Indeed, only the surface binder is exposed to UV rays and weathering. In order to assess the ageing of only the surface layer, to verify, for instance the influence of ageing on adhesion characteristics, it is necessary to extract and recover only the surface asphalt binder. A new test protocol, presented in this paper, has been developed to fulfil this purpose. This protocol consists in sampling only small particles at the surface layer, extracting the binder from the particles and performing Fourier transform infrared spectroscopy (FTIR) tests to assess the ageing of the binder. As the quantity of binder is very small, a specific FTIR test method is used. This method consists in keeping the binder diluted in the solvent and placing the solution in the ray of the spectrometer to perform the measurement. This new method has been compared to a more typical one, which consists in applying the binder on a transparent plate after having extracted the binder from the solvent. Once it has been checked that the two methods provide the same results for three kinds of binders, surface ageing tests have been performed. Two different ageing processes were considered: an ageing on site and an accelerated ageing protocol using a climate chamber named Weatherometer (SUNTERTXXL+). In this chamber, temperature, humidity and rain are controlled. The comparison between the ageing in the laboratory and the field allowed correlating both processes to establish an accelerator factor with respect to the increase in carboxyl group.

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Section: Comparison Of Methods (M1 and M2) For Sample Preparationmentioning

confidence: 99%

Characterisation of ageing processes on the asphalt mixture surface

Lopes

Zhao²,

Chailleux³

et al. 2014

Road Materials and Pavement Design

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“…While it is known that the aged binder in the RAP and RAS blends with the virgin material to some degree, the extent of blending is still unknown. The properties of mixtures containing RAP or RAS have been shown to be different than virgin mixtures; however, the effective properties of the binder in a mixture containing recycled binder cannot be directly measured, as the process of extracting the binder results in full blending of the virgin and aged binder (Eddhahak-Ouni et al, 2012;Mangiafico et al, 2013; 2. Research objective The objective of this study was to determine the performance and behaviour of HMA mixtures containing RAS in the laboratory.…”

Section: Introductionmentioning

confidence: 98%

An evaluation of reclaimed asphalt shingles in hot mix asphalt by varying sources and quantity of reclaimed asphalt shingles

Barry¹,

Daniel

Foxlow

et al. 2013

Road Materials and Pavement Design

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The practice of incorporating reclaimed asphalt pavement (RAP) into hot mix asphalt (HMA) is common within the paving industry as a cost-effective source of quality paving binder and aggregate. Recently, research efforts have focussed on investigating the potential of using reclaimed asphalt shingles (RAS) in HMA. This study provides a comparison of the laboratory performance of several HMA mixtures with varied RAS sources and contents. Performance testing for the mixtures included dynamic modulus and phase angle. Fatigue testing was also performed for several of the mixtures. Mixtures with higher amounts of binder replacement from RAS showed stiffer performance at high temperatures and less stiff performance at low temperatures. The mixture with greater amounts of RAS showed better fatigue performance. The mixtures with various sources of RAS, whether pre-or post-consumer, showed similar low-temperature performance, while the mixture with a blend of both sources was stiffest at high temperatures. A set of mixtures comparing different RAS sources was also compared with a mixture containing RAP as the only recycled binder source. The results of testing of these mixtures showed that the RAP mix was stiffer at intermediate and high temperatures but had similar results to the RAS mixtures in low-temperature performance.

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“…The recycled asphalt can be prepared by mixing reclaimed asphalt pavement (RAP), virgin bitumen, virgin mineral aggregates and rejuvenating agents. In principle, the RAP bitumen needs to be combined with suitable virgin bitumen (or rejuvenating agents) to create recycled bitumen with good adhesive and cohesive properties in order to avoid premature failure of the recycled asphalt pavement [2]. It is still not understood how the virgin bitumen mixes with the RAP bitumen but it is believed that the degree of blending between the RAP bitumen and the virgin bitumen plays a role on the final properties of the recycled asphalt.…”

Section: Introductionmentioning

confidence: 99%