Changes in fractional compositions of PPA and SBS modified asphalt binders

Alam, Shahriar; Hossain, Zahid

doi:10.1016/j.conbuildmat.2017.07.021

Cited by 64 publications

(19 citation statements)

References 16 publications

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“…Their research showed a significant influence of the chemical fractions on the physical, rheological, aging and adhesion behavior of the properties of asphalt binders. Alam and Hossain [12,13] studied asphalt binders modified with PPA (Polyphosphoric acid) and SBS. They found that modification increase the Asphaltene contents as well as the viscosity of asphalt binder.…”

Section: Literature Reviewmentioning

confidence: 99%

Evaluation of Selected Performance Properties of Nanoclay-Modified Asphalt Binders

2019

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Asphalt binders are often modified with additives such as acid, polymer, or a combination of multiple additives to achieve improved performance to sustain heavy loads and adverse weather conditions. According to some previous researches, nanoclay can be a good alternative of currently practiced Styrene-Butadiene-Styrene (SBS) modification, and the former is expected to reduce the overall cost of the asphalt binder. Three types of nanoclay (Cloisite 10A, 11B, and 15A) were blended with asphalt binders prepared from two different sources (Arabian Crude and Canadian Crude). A blending protocol has been developed to blend nanoclay with the base binders. Mechanical properties including viscosity, rutting parameter have undergone significant changes after the nanoclay modification. It was also observed that nanoclay modified binders offer different moisture susceptibility while bonding with different aggregates; the nanoclay modified asphalt binder exhibits better bonding with gravel than sandstone. Mechanistic properties such as viscosity and rutting parameter are found to be highly correlated with the chemical compositions. Binders from the Canadian crude showed more colloidal stability than binders from the Arabian crude after nanoclay modification.

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Section: Literature Reviewmentioning

confidence: 99%

Evaluation of Selected Performance Properties of Nanoclay-Modified Asphalt Binders

2019

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“…It has become the most widely used acid in the technical field of modified asphalt because of its excellent modification effect, simple preparation technique, low price, and good compatibility with asphalt. The literature shows that a small amount of PPA can markedly enhance the Superpave performance grade (PG) of asphalt binders [ 20 ]. It takes approximately 0.8 wt% to 1.2 wt% PPA to raise a full high-temperature PG grade.…”

Section: Introductionmentioning

confidence: 99%

Influence of Compound Modification of Oil Sands De-Oiled Asphalt and Polyphosphoric Acid on High- and Low-Temperature Performance of Styrene-Butadiene-Styrene-Modified Asphalt

Pei

Fan

2021

Materials

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Oil sands de-oiled asphalt (OSDOA) has become a bottleneck for refineries due to its enormous production and huge landfill costs. Applying OSDOA as a modifier is an effective way to reduce environmental pollution and disposal cost. In this study, the influences of OSDOA and polyphosphoric acid (PPA) compound modification on styrene-butadiene-styrene (SBS)-modified binder were investigated. The high-temperature rutting resistance, low-temperature anti-crack performance and fatigue resistance were obtained by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) test. Storage stability and microstructure were also investigated by storage test and Fourier-transform infrared (FTIR) spectroscopy. The results demonstrated that the compound modification of OSDOA/PPA dramatically enhanced the deformation resistance of SBS-modified binder and reduced its low-temperature cracking resistance. The anti-fatigue performance was also decreased. Moreover, the combined effect of OSDOA and PPA could produce composite modified asphalt with excellent storage stability, which was verified by desirable fluorescence images. Furthermore, both physical and chemical interactions coexisted during the OSDOA/PPA compound modification process. Consequently, the optimal doses of OSDOA and PPA were determined to be 10 wt% and 1.0 wt%, considering of the balance between high- and low-temperature characteristics and storage stability of composite modified asphalt.

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“…Dai et al found that the weathering caused the morphology changes of SARA fractions in different ways and at different speeds during the aging. Alam et al pointed out that the addition of styrene butadiene styrene in bitumen did not change the asphaltenes content, but altered the contents of aromatics and resins.…”

Section: Introductionmentioning

confidence: 99%

Mass loss evolution of bituminous fractions at different heating rates and constituent conformation of emitted volatiles

Xia

Wang

et al. 2019

Energy Science & Engineering

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Bitumen is frequently used as energy source. To further understand bituminous combustion and emitted volatiles during its energy generation and conversion at the fraction level including saturates, aromatics, resins, and asphaltenes (SARA), an elemental analyzer, thermogravimetry coupled with mass spectrometer and Fourier‐transform infrared spectroscopy (TG‐MS‐FTIR) were utilized to monitor the mass loss evolution, and confirm molecular structures of emitted volatiles, and track the whereabouts of main elements during each SARA fraction combustion. Results indicate that TG, DTG, and Gram‐Schmidt (G‐S) curves show two‐stage characteristics, while the total ion chromatogram (TIC) curves present one‐stage characteristic during each SARA fraction combustion. Also, as the heating rate is raised, TG, DTG, TIC, and G‐S curves are shifted to higher temperature and the total emitted volatile amount is increased from saturates to asphaltenes. Molecular weights of main volatiles are distributed in the range of 12‐64. The elemental species of volatiles are consistent with those of SARA fractions. Finally, the typical volatiles of saturates and aromatics are similar, and the release amount of CO and CO2 at stage II is larger than those at stage I. SO2 is released during the combustion of resins. SO2 and NO2 are identified in volatiles of asphaltenes.

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Changes in fractional compositions of PPA and SBS modified asphalt binders

Cited by 64 publications

References 16 publications

Evaluation of Selected Performance Properties of Nanoclay-Modified Asphalt Binders

Evaluation of Selected Performance Properties of Nanoclay-Modified Asphalt Binders

Influence of Compound Modification of Oil Sands De-Oiled Asphalt and Polyphosphoric Acid on High- and Low-Temperature Performance of Styrene-Butadiene-Styrene-Modified Asphalt

Mass loss evolution of bituminous fractions at different heating rates and constituent conformation of emitted volatiles

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