UV and Thermal Aging of Pure Bitumen-comparison Between Laboratory Simulation and Natural Exposure Aging

Wu, Shaopeng; Pang, Ling; Mo, Liantong; Qiu, Jian; Zhu, Guojun; Xiao, Yue

doi:10.1080/14680629.2008.9690161

Cited by 54 publications

(31 citation statements)

References 6 publications

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“…Já Wu et al (2008a) compararam o envelhecimento clássico usando as estufas RTFO e PAV com o envelhecimento ao ar livre. Em outro estudo, Wu et al (2008b) compararam o envelhecimento de um ligante asfáltico puro em estufa UV e ao ar livre e constataram boa correlação entre os resultados reológicos nos dois procedimentos.…”

Section: -81unclassified

Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR

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2017

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Resumo: O envelhecimento dos ligantes asfálticos afeta diretamente as propriedades mecânicas das misturas asfálticas. Neste sentido, as especificações limitam determinados índices ou parâmetros de envelhecimento, visando contornar o endurecimento excessivo do ligante asfáltico. No entanto, as especificações para ligantes asfálticos não levam em consideração o efeito da radiação ultravioleta (UV) sobre as propriedades reológicas dos materiais. Os objetivos deste trabalho são (i) quantificar os efeitos da radiação UV sobre as propriedades reológicas de um CAP 50/70 e cinco ligantes asfálticos modificados com PPA e os copolímeros SBS e SBR (CAP+PPA, CAP+SBS, CAP+SBS+PPA, CAP+SBR e CAP+SBR+PPA) e (ii) comparar os níveis de envelhecimento decorrentes da radiação com o envelhecimento na estufa PAV. Os ligantes asfálticos envelhecidos na estufa PAV e sob radiação UV foram previamente envelhecidos na estufa RTFO. As modificações proporcionaram materiais mais resistentes ao envelhecimento a longo prazo, tanto na estufa PAV quanto no wetherometer (radiação UV), destacando-se o CAP+SBR+PPA.Palavras-chave: radiação ultravioleta, envelhecimento a longo prazo, ligantes asfálticos modificados. Abstract:The aging process suffered by asphalt binders interferes directly with the mechanical properties of HMA mixes. In order to avoid an excessive hardening of the asphalt binder, the specifications limit certain aging indices or aging parameters. However, asphalt binder specifications do not take account of the effect of the ultraviolet radiation (UV) on the rheological properties of such materials. The objectives of this work are (i) to quantify the effects of the UV radiation on the rheological properties of a 50/70 pen-grade asphalt binder and five asphalt binders modified with polyphosphoric acid and the SBS and SBR copolymers (binder+PPA, binder+SBS, binder+SBS+PPA, binder+SBR and binder+SBR+PPA) and (ii) to compare the aging levels caused by UV radiation with the aging level in the PAV. The samples aged in the PAV and in the wetherometer were previously aged in the RTFO oven. The use of modifiers increased the resistance to long-term aging of the materials, either in the PAV or in the wetherometer. The binder+SBR+PPA showed the best performance in terms of aging resistance.Keywords: ultraviolet irradiation, long-term aging, modified asphalt binders. INTRODUÇÃOO envelhecimento dos ligantes asfálticos é um fenô-meno complexo, na extensão em que promove alterações de natureza física e química nestes materiais, que estão diretamente associadas a mecanismos de ruína da camada asfál-tica, como desagregação e trincamento por fadiga e/ou de origem térmica (Huang et al., 1996). Dada a sua influência sobre as propriedades reológicas dos ligantes asfálticos, o envelhecimento tem sido objeto de estudos ao longo das úl-timas décadas, com o intuito de tentar incluir alguns crité-rios de controle nas especificações destes materiais.Dentre os principais fatores intervenientes sobre o envelhecimento dos ligantes asfálticos estão as característ...

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Section: -81unclassified

Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR

Nascimento

Faxina

2017

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“…Generally such changes reduce the durability of materials, when subjected to continuous loading. This phenomenon for asphalt pavement is for instance commonly observed by changes in the (viscoelastic) mechanical properties of the bituminous binder [2,3,4,5]. This is specifically true for PA wearing courses as the open structure allows the environment to influence a large fraction of the binder throughout the wearing course.…”

Section: Introductionmentioning

confidence: 97%

Comparing field aging to artificial laboratorial aging of bituminous binders for porous asphalt concrete using black space graph analysis

Lent¹,

Mookhoek²,

Vliet³

et al. 2016

Proceedings of 6th Eurasphalt &Amp; Eurobitume Congress

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The majority of the Dutch highway network (approx. 95%) is paved with a wearing course of Porous Asphalt Concrete (PAC). Aging behaviour of the bituminous binder in the PAC is a key parameter for the service life of the pavement. In this paper a review is described concerning the development of field aging and artificial laboratorial aging in terms of the rheological properties (complex modulus and phase angle) of the bituminous binder. For this an extensive database with the development of the rheological properties of the bituminous binder over years from three different pavement trial sections are compared to a large set of artificial laboratorial aging results found in literature. The results are analysed and compared by plotting the data together in black space graphs as function of their aging. From these black space graphs conclusions can be drawn concerning the suitability and predictability of the artificial laboratorial aging methods for the aging of the bituminous binder in the field. On basis of the black space graphs it is demonstrated which laboratorial aging technique appears most representative for simulating ageing in PAC.

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“…This is because there are other variables involved in a natural ageing process (such as ultraviolet irradiation) that are not considered in the above-mentioned laboratory procedures. As a consequence, a short-term exposition of the material to the natural environment may have a higher impact on its rheological properties when compared with the conventional accelerated ageing protocols (Wu et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Accelerated short-term ageing effects on the rheological properties of modified bitumens with similar high PG grades

Domingos

Faxina

2015

Road Materials and Pavement Design

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The main purpose of the study was to evaluate the effects of rolling thin-film oven (RTFO) ageing on some rheological properties of modified bitumens. They are graded as PG 76-xx and were obtained from a 50/70 bitumen graded as PG 64-xx. Three types of polymerspolyethylene (PE), styrene-butadiene-styrene (SBS) copolymer and ethylene butylacrylate glycidylmethacrylate (Elvaloy ® ) terpolymer -and polyphosphoric acid (PPA) were selected. Ageing mainly increased the complex modulus (G*) and decreased the phase angle (δ) of the bitumens, thereby increasing their stiffness and elasticity. The existence of plateau regions in the master curves of δ for the bitumen + Elvaloy + PPA and the bitumen + SBS can be explained by the distinctive characteristics of the modifiers, since these plateaus were not observed for the other bitumens. The bitumen + SBS and the bitumen + PE showed very high sensitivity to ageing from the point of view of G* and δ, and the opposite is observed for the conventional properties.

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UV and Thermal Aging of Pure Bitumen-comparison Between Laboratory Simulation and Natural Exposure Aging

Cited by 54 publications

References 6 publications

Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR

Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR

Comparing field aging to artificial laboratorial aging of bituminous binders for porous asphalt concrete using black space graph analysis

Accelerated short-term ageing effects on the rheological properties of modified bitumens with similar high PG grades

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