Studies on the aging behavior of the Arabian asphalts

Siddiqui, Mohammad Nahid; Ali, Mohammad Farhat

doi:10.1016/s0016-2361(99)00018-6

Cited by 206 publications

(112 citation statements)

References 11 publications

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“…The oxidation of hydrocarbons is associated, notably, with the increase of C=O (1700 cm −1 ) and S=O (at 1030 cm −1 ) bonds for laboratory aged asphalt (Mouillet et al 2008;Siddiqui and Ali 1999). This has been confirmed with in situ aging on asphalt roads by Lamontagne et al (2001a), Jung (2006) and Chávez-Valencia et al (2007).…”

Section: Ftir-atr Analysissupporting

confidence: 53%

“…While regular maintenance cycles can mitigate the aging effects, the long-term aging effects on the bitumen will eventually lead to surface cracks that require the pavement to be rehabilitated or replaced (Smith and Edwards 2001). The initial hardening of the bitumen (short-term aging) is largely due to the evaporation of the lighter aromatics, naphthene aromatics during bitumen storage at hot temperature (160-180°C), along with mixing (160°C+) while the long-term aging effects are due to the oxidation over the in-service time (Chávez-Valencia et al 2007;Siddiqui and Ali 1999). Another possible contributor to aging is ultraviolet (UV) radiation from exposure to the sun (Durrieu et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ftir-atr Analysissupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…It is confirmed that the aging of asphalt in service is mainly caused by the different environments to which the asphalt is subjected. From a chemical perspective, Lu and Siddiqui have concluded that thermal oxygen induces the formation of carbonyl and sulphoxide groups [8,9]. Lin proposed that carbonyl area index could be used as a Appl. Sci.…”

Section: Introductionmentioning

confidence: 99%

Aging Characteristics of Rubber Modified Asphalts in Different Environmental Factors Combinations

et al. 2017

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Two kinds of rubber modified asphalts were investigated and compared with virgin asphalt. In order to get closer to engineering practice, different combinations of four environmental factors were merged into the laboratory aging simulation. Subsequently, conventional property tests, including softening point, viscosity, creep stiffness, creep rate, and fatigue cracking were conducted on asphalt samples. The performance difference of asphalt before and after aging was selected as an evaluation index for asphalt aging degree. The results indicate that two kinds of rubber modified asphalts show stronger resistant ability to temperature deformation and better resistance to traffic loading than virgin asphalt in all kinds of environmental factors combinations. Tests on chemical analyses were conducted to investigate the asphalt aging characteristics. The apparent morphology of rubber modified asphalts are described in detail under an environment scanning electron microscope (ESEM). The damage condition reflected in images reveals the aging degree caused by multiple environmental factors. Moreover, the thermogravimetric analysis (TG) confirms that three kinds of asphalts can maintain thermal stability in various environments. Additionally, new characteristic functional groups were not detected in the infrared (IR) spectra of rubber modified asphalts, which means they have stable antioxidant properties given that their oxidation degrees change slightly throughout the aging processes.

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“…In terms of fractional components, it has been demonstrated that ageing determines a decrease of the aromatics content with a consequent increase of relative amounts of resins and asphaltenes (Moschopedis and Speight 1977;Siddiqui and Ali 1999). This is due to the fact that aromatics generate resins that in turn generate asphaltenes.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the fact that aromatics generate resins that in turn generate asphaltenes. These chemical changes involve larger and more polar molecules (Bahia and Anderson 1995), revealed by the formation of new functional groups such as carbonyls and sulfoxides (Siddiqui and Ali 1999;Leuseur 2009).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

et al. 2015

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Physical hardening is a phenomenon that takes place at low temperatures, producing time-dependent isothermal changes in the rheological properties of bituminous binders. Stiffening effects caused by physical hardening combine with those consequent to chemical ageing, thus promoting the build-up of thermally-induced stresses which may lead to premature pavement failure. The main goal of this paper was to investigate the influence of physical hardening on low temperature properties of bituminous binders tested in different ageing conditions. Moreover, reversibility of hardening phenomena was directly assessed by means of a dedicated testing protocol. The study, carried out by making use of the Bending Beam Rheometer (BBR), considered four binders of different type and origin (two neat bitumens and two commercial SBS polymer-modified binders) and three ageing conditions (original, short-term ageing and long-term ageing). Obtained results, expressed in terms of a Physical Hardening Rate (PHR), showed a significant effect of chemical ageing on low temperature hardening of binders. In particular, rate of hardening was found to vary with temperature and to decrease with degree of ageing. Reversibility of the hardening process was also verified.

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Studies on the aging behavior of the Arabian asphalts

Cited by 206 publications

References 11 publications

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

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

Aging Characteristics of Rubber Modified Asphalts in Different Environmental Factors Combinations

Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

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