Physical and rheological properties of modified sulfur asphalt binder

El-Kholy, S. A.; El-Rahman, Abd; El‐Shafie, M.; Abo-Shanab, Z.L.

doi:10.1016/j.ijprt.2018.07.005

Cited by 18 publications

(12 citation statements)

References 11 publications

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“…Regardless of sulfur/copolymer type, their addition increases the softening temperature and decreases penetration without significant impact on the behavior of binders in low temperatures (Fraas breaking point). A similar general trend of softening point and penetration changes has been obtained by Elkholy et al [30], who used the thermally modified sulfur (90% wt) with a mixture of residual olefinic hydrocarbons (distillate fractions of C5) and bituminous residue (10% wt) as a modifier of bitumen binder (60/70). In turn, modification of BND 60/90 with elemental sulfur carried out by Syroezhko et al [25] with small sulfur addition (below 10% wt) led to a decrease of softening point and increase of penetration (plasticization effect), while above 10% wt (up to 40 wt %) surprisingly reversed the trend.…”

Section: Thermal Behaviour Of Sulfur/organic Copolymers (Tga-dsc)supporting

confidence: 74%

Bitumen Binders Modified with Sulfur/Organic Copolymers

et al. 2022

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With the continuing growth of waste sulfur production from the petroleum industry processes, its utilization for the production of useful, low-cost, and environmentally beneficial materials is of primary interest. Elemental sulfur has a significant and established history in the modification of bitumen binders, while the sulfur-containing high-molecular compounds are limited in this field. Herein, we report a novel possibility to utilize the sulfur/organic copolymers obtained via the inverse vulcanization process as modifiers for bitumen binders. Synthesis and thermal characterization (TGA-DSC) of polysulfides derived from elemental sulfur (S8) and unsaturated organic species (dicyclopentadiene, styrene, and limonene) have been carried out. The performance of modified bitumen binders has been studied by several mechanical measurements (softening point, ductility, penetration at 25 °C, frass breaking point, adhesion to glass and gravel) and compared to the unmodified bitumen from the perspective of normalized requirements concerning polymer-modified bitumen. The interaction of bitumen binder with sulfur/organic modifier has been studied by means of FTIR spectroscopy and DSC measurements. The impact of the modification on the performance properties of bitumen has been demonstrated. The bitumen binders modified with sulfur/organic copolymers are in general less sensitive to higher temperatures (higher softening point up to 7 °C), more resistant to permanent deformations (lower penetration depth), and more resistant to aging processes without intrusive deterioration of parameters at lower temperatures. What is more, the modification resulted in significantly higher adhesion of bitumen binders to both glass (from 25% up to 87%) and gravel surfaces in combination with a lower tendency to form permanent deformations (more elastic behavior of the modified materials).

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Section: Thermal Behaviour Of Sulfur/organic Copolymers (Tga-dsc)supporting

confidence: 74%

Bitumen Binders Modified with Sulfur/Organic Copolymers

et al. 2022

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“…Figure 2 reveals the penetration index (PI) of different samples, as described in the 1st and 2nd phase of the methodology. The general value of the PI ranges from −3 for high temperature-susceptible to +7 for highly blown low temperature-susceptible (high PI) asphalt binders, as described in the literature [34]. It can be observed from Table 2 that penetration and ductility decreased, and the softening point increased significantly from VB to VBSTA, VBLTA, and RB.…”

Section: Conventional Properties Of the Virgin Aged And Rejuvenatedmentioning

confidence: 81%

Effect of Cereclor as Rejuvenator to Enhance the Aging Resistance of Reclaimed Asphalt Pavement Binder

Yaseen

Hafeez

2020

Materials

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Asphalt is the most commonly used material for pavement construction around the world, and therefore, it is vital to acquaint a practice that restores the reclaimed asphalt pavement (RAP) binder properties to the required level of performance by adding proper rejuvenators. However, a rejuvenator may perform better in the early stages of its application but may not necessarily perform better in the long run. The aim of this study is to assess the rejuvenation effect on the aging resistance of RAP binder in long-life performance through applying artificial aging. In this study, base virgin binder of pen grade 60/70 and RAP binder rejuvenated with Cereclor were subjected to artificial aging to simulate the short- and long-term aging effects. Penetration, softening point, ductility, and viscosity; saturates, aromatics, resins, and asphaltene (SARA) fractionation; and Fourier-transform infrared (FTIR) spectroscopy, bending beam rheometer (BBR), and dynamic shear rheometer (DSR) tests were conducted to evaluate the potential improvements in various properties of RAP binder. The results indicated that the physical, fractional composition, rheological, and aging resistance of RAP binder improved through the rejuvenation mechanism. Therefore, the rejuvenator improved the chemical structure through re-balancing the constituents in the colloidal system, even after long-term re-aging, which proves it to be an aging-resistant binder. Furthermore, it has been concluded that Cereclor has substantial rejuvenation potential even after applying artificial aging, and it can be utilized in pavement recycling to achieve long-life performance. Furthermore, the results depict good correlations between the physical, rheological, and chemical parameters of virgin and RAP binder.

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“…By assuming bitumen has a penetration of 800 at softening point, PI values were calculated for each PS ratio (Table 3). These calculation steps are well explained in reference [30]. There was a constant decrease in PI values which means a rise in temperature susceptibility.…”

Section: Softening Pointmentioning

confidence: 75%

“…The softening point test measures the temperature value where bitumen reaches a certain softness. Bitumen has an approximately penetration value of 800 or absolute viscosity of 13 000 poises when it is at its softening point [30]. Therefore, softening point test reveals the relationship between viscosity and temperature of the bitumen.…”

Section: Softening Pointmentioning

confidence: 99%

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Modification of Asphalt Binder with Waste Expanded Polystyrene (EPS) Foam

Yıldız

Kınacı

Atakan

2021

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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Waste polymers are widely used in asphalt modification, especially, in order to reduce their detrimental effect on the environment. This study discusses the usability of waste expanded polystyrene (EPS) foam in asphalt modification. In this respect, the EPS foam, which produces waste in both production and use stages, was mixed with bitumen by weight at the ratios of 2%, 4%, 6%, and 8%, and dry modification method was employed. The penetration, ductility, softening point, flash point, and specific gravity values of virgin bitumen were compared with waste EPS foam modified bitumen. The comparison was made by both graphical and statistical methods. A strong correlation between the physical properties of modified asphalt and the ratio of EPS foam was observed. A drop was observed in penetration and ductility values. Besides, it was found by statistical analyses that 2% of the increase in the additive ratio is not sufficient to make a significant difference in the physical properties of bitumen, therefore, the increase should be at least 4%. Overall, it is concluded that EPS foam additive can be used in bitumen modification for hot regions where low penetration is required.

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Physical and rheological properties of modified sulfur asphalt binder

Cited by 18 publications

References 11 publications

Bitumen Binders Modified with Sulfur/Organic Copolymers

Bitumen Binders Modified with Sulfur/Organic Copolymers

Effect of Cereclor as Rejuvenator to Enhance the Aging Resistance of Reclaimed Asphalt Pavement Binder

Modification of Asphalt Binder with Waste Expanded Polystyrene (EPS) Foam

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