Hot Recycling of Bituminous Mixtures

Roche, Chantal de La; Ven, Martin van de; Planche, Jean‐Pascal; Bergh, Wim van den; Grenfell, James; Gabet, Thomas; Mouillet, Virginie; Porot, Laurent; Farcas, Fabienne; Ruot, Carole

doi:10.1007/978-94-007-5104-0_7

Cited by 23 publications

(16 citation statements)

References 6 publications

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“…Many laboratory studies concerning the evaluation of performance of recycled mixtures with high RAP content have been carried out (Aurangzeb et al 2012;Frigio et al 2014;Stimilli et al 2013). However, it is widely recognized that mixtures prepared in plant for a large scale production could not perform as well as mixtures optimized in laboratory (de la Roche et al 2013). Many aspects related to the in plant production process, not fully repeatable in laboratory, can alter the mixture performance.…”

Section: Introductionmentioning

confidence: 96%

“…Also in the pavement industry, recycling has gained increasing importance for the production of new asphalt mixtures. In fact, it allows the optimization of the materials in terms of costs and natural resources saving (de la Roche et al 2013). Many laboratory studies concerning the evaluation of performance of recycled mixtures with high RAP content have been carried out (Aurangzeb et al 2012;Frigio et al 2014;Stimilli et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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In Plant Production of Hot Recycled Mixtures with High Reclaimed Asphalt Pavement Content: A Performance Evaluation

et al. 2015

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Nevertheless hot recycling process is nowadays a widespread technique, many doubts related to the in plant recycling process effects on the performance of recycled mixtures still exist and limit the maximum allowable amount of Reclaimed Asphalt Pavement (RAP). Therefore, the feasibility of an efficient production of plant hot recycled mixtures characterized by high RAP content and suitable performance should be properly addressed. To this aim, the overall performance of hot recycled asphalt mixtures produced in asphalt plant and containing high RAP content were assessed in this study. The mixtures were prepared with two different bitumens (high and low content of SBS polymer modifier) and 40 % of RAP only deriving from asphalt layers containing polymer modified bitumens. The aggregate grading curve was previously optimized through a specific laboratory study by applying the Bailey Method and using selected RAP. A third mixture, currently used for binder layers in motorway pavements, was also studied for comparative purposes. Compactability, stiffness, cracking and rutting resistance and fatigue behavior were investigated. Results of the mechanical tests suggest that mixtures containing 40 % RAP are suitable for the production of new asphalt pavements, especially when low modified bitumens are used. In fact, the performance of such mixtures were comparable or even higher than those of the reference mixture. In particular, the specific and accurate mix design allowed the potential drawbacks due to higher RAP content to be balanced.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

In Plant Production of Hot Recycled Mixtures with High Reclaimed Asphalt Pavement Content: A Performance Evaluation

et al. 2015

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“…This is because some of the volatiles for their in-field conditions would never achieve their volatility temperature. De la Roche et al (2013) conducted the aging of asphalt in two stages; the first at 135°C for 4 h and the second at 85°C for 9 days, finding that plant and laboratory manufactured asphalt ages differently in terms of the same indicators.…”

Section: Bitumen and Mastic Agingmentioning

confidence: 99%

Methods for Analyzing the Chemical Mechanisms of Bitumen Aging and Rejuvenation with FTIR Spectrometry

2015

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The recycling of asphalt is a process where old pavement is broken up and used as reclaimed asphalt pavement (RAP) in new asphalt pavement, often with the aid of recycling agents. The goal of asphalt recycling agents is to reintroduce the properties lost in bitumen and asphalt during aging such as penetration, softening point, viscosity, ductility, cohesion and adhesion to aggregate, reducing the performance of asphalt and requiring its replacement. The purpose of this study is to observe the chemistry of bitumen aging and the effects of recycling agents may have in reversing it. Fourier transform infrared spectroscopy (FTIR)-attenuated total reflectance (ATR) was used to analyse the bitumen aging and regeneration in terms of the evolution of carbonyl, sulfoxide and other bands. FTIR-ATR microscopy was used to study the distribution of these bands between the aggregates in order to understand the remobilization of the old asphalt (RAP) by the recycling agents through observing their penetration into the RAP. A method for aging bitumen and mastic in a ventilated oven was developed. An increase in C=O and S=O indices was observed with aging, plateauing after 7d.

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“…As conclusions, the aged mixtures are the stiffer; the WMAs seem to be the most impacted by the aging process. But whatever the material, the modulus is always higher than the one requested by the standards (NF EN 13108-1) for this kind of materials (7,000 MPa at 15°C, 10 Hz).…”

Section: Complex Modulus Tests (According To En 12697-26 Annex A)mentioning

confidence: 74%

“…Muito cuidado deve ser tomado na preparação das amostras para análise, pois os resultados obtidos por esta técnica variam bastante com a pressão de aperto exercida pelo cristal e a rugosidade da superfície observada (MONTEIRO, 2007 As misturas 1,2,5,6,7,8 …”

Section: Diferentes Misturas Com Diferentes Marcadores Químicosunclassified

Avaliação da durabilidade de misturas asfálticas a quente e mornas contendo material asfáltico fresado.

Gennesseaux¹

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7Valerie, Brigitte, Audray e Virginie por me iniciarem e acompanharem nas técnicas de microscopia ATR e pelo acolhimento no CEREMA de Aix en Provence.Agradeço ainda pela companhia dos amigos e colegas que fiz em Nantes: Ciryl, Christelle, Tung, Laure, Miguel, Manitou, Antoine, Antony, Fred, Stephane, Andrea, Layella, Hanna, Eric e todos os estagiários que vi passar durante o período que estive no IFSTTAR.Agradeço aos prefessores, técnicos e alunos do LTP/USP pelos bons momentos que passamos: Iuri, Kamilla, Rosângela, Patrícia, Márcia, Tiago, Lucas, Igor, Vanderley, Robson, Edson, Diomária, Kasuo e Sérgio.Gostaria de agradecer a todas as pessoas que me ajudaram nas inúmeras papeladas e brurocracias necessárias para o bom andamento da tese: Karine Allenne, Patrícia Santana, Diomária, Vanda, Eliana e Iuri.Gostaria de agradecer ao meu grande amigo Iuri Bessa, que foi fundamental no decorrer do doutorado, me ajudando a resolver vários problemas quando eu não estava presente em São Paulo.Gostaria de expressar minha enorme gratidão ao meu caríssimo professor Jorge Soares por ter sido meu incentivador a fazer este doutorado em São Paulo e em cotutela com a França. Obrigada por acreditar mim, por me apoiar sempre, me fazendo sonhar e realizar sonhos. Josemaria Escrivá 9 RESUMOA reciclagem de misturas asfálticas usando técnicas de misturas mornas atende às exigências da sustentabilidade, limitando o consumo de energia e de novos materiais. A reciclagem de revestimentos asfálticos fresados (RAP) é praticada há mais de 40 anos, por meio de usinagem a quente do RAP adicionado a agregados e ligante novos. Todavia, o uso de elevadas taxas de RAP (acima de 25% no total), é um grande desafio até o presente, pois limita a perda de durabilidade da mistura asfáltica final. O RAP contém ligante asfáltico envelhecido aderido aos agregados, porém uma parte desse ligante pode ser remobilizada durante a reciclagem pelo aumento da temperatura no processo de usinagem. Esta tese busca compreender o processo de remobilização do ligante envelhecido durante a reciclagem do RAP e as consequências da magnitude de temperatura empregada no processo de reaquecimento deste material envelhecido. Atualmente, tem-se buscado o uso da tecnologia de usinagem morna, permitindo a redução de temperatura total no processo de fabricação. Um dos problemas possíveis da combinação das técnicas reciclagem morna é a ocorrência do fenômeno de recobrimento duplo, que pode impactar na reologia do novo material: o ligante do RAP e o ligante novo não se misturariam totalmente, devido à redução das temperaturas de fabricação, formando camadas superpostas. Este fenômeno seria a causa de disfuncionamentos mecânicos da mistura asfáltica final. Questiona-se então a qualidade do recobrimento dos agregados do RAP, já recobertos, e a falta de um meio de caracterização para a observação da interface. Neste estudo, a qualidade do recobrimento do RAP foi avaliada em escala microscópica e macroscópica. No nível microscópico, foi proposto o uso de uma ferramenta de micro-espectros...

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Hot Recycling of Bituminous Mixtures

Cited by 23 publications

References 6 publications

In Plant Production of Hot Recycled Mixtures with High Reclaimed Asphalt Pavement Content: A Performance Evaluation

In Plant Production of Hot Recycled Mixtures with High Reclaimed Asphalt Pavement Content: A Performance Evaluation

Methods for Analyzing the Chemical Mechanisms of Bitumen Aging and Rejuvenation with FTIR Spectrometry

Avaliação da durabilidade de misturas asfálticas a quente e mornas contendo material asfáltico fresado.

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