Evaluation of the adhesion characteristics of material composition for polyphosphoric acid and SBS modified bitumen based on surface free energy theory

Li, Bo; Li, Xiaolan; Kundwa, Marie Judith; Li, Zhiwei; Wei, Dingbang

doi:10.1016/j.conbuildmat.2020.121022

Cited by 31 publications

(13 citation statements)

References 33 publications

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“…Although it is a fact that polymer modifiers enhance the resistance against thermal susceptibility of bitumen, each type of polymer has a specific effect on bitumen properties [ 12 ]. For instance, reactive and plastomer polymers tend to increase the stiffness and resistance to deformation due to load, whereas elastomer polymers improve the elastic properties (resistance to fatigue) of bitumen [ 67 ]. It is reported that reactive polymers improve the compatibility between polymer and bitumen as well as require less additives for the stabilisation of the polymer phase.…”

Section: Modification Of Bitumenmentioning

confidence: 99%

Sustainable Polymers from Recycled Waste Plastics and Their Virgin Counterparts as Bitumen Modifiers: A Comprehensive Review

2021

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The failure of bituminous pavements takes place due to heavy traffic loads and weather-related conditions, such as moisture, temperature, and UV radiation. To overcome or minimize such failures, a great effort has been put in recent years to enhance the material properties of bitumen, ultimately improving field performance and increasing the pavement service life. Polymer modification is considered one of the most suitable and by far the most popular approach. Elastomers, chemically functionalised thermoplastics and plastomers * (* Note: notwithstanding the fact that in Polymer Science the word ‘plastomer’ indicates a polymer with the simultaneous behaviour of an elastomer and plastics (thermoplastics), this paper uses the term ‘plastomer’ to indicate a thermoplastic polymer as it is more commonly found in Civil and Pavement Engineering.) are the most commonly used polymers for bitumen modification. Plastomers provide several advantages and are commonly acknowledged to improve high-temperature stiffness, although some of them are more prone to phase separation and consequent storage instability. Nowadays, due to the recent push for recycling, many road authorities are looking at the use of recycled plastics in roads. Hence, some of the available plastomers—in pellet, flakes, or powder form—are coming from materials recycling facilities rather than chemical companies. This review article describes the details of using plastomers as bitumen modifiers—with a specific focus on recycled plastics—and how these can potentially be used to enhance bitumen performance and the road durability. Chemical modifiers for improving the compatibility between plastomers and bitumen are also addressed in this review. Plastomers, either individual or in combination of two or three polymers, are found to offer great stiffness at high temperature. Different polymers including HDPE, LDPE, LLDPE, MDPE, PP, PS, PET, EMA, and EVA have been successfully employed for bitumen modification. However, each of them has its own merit and demerit as thoroughly discussed in the paper. The recent push in using recycled materials in roads has brought new light to the use of virgin and recycled plastomers for bitumen modification as a low-cost and somehow environmental beneficial solution for roads and pavements.

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Section: Modification Of Bitumenmentioning

confidence: 99%

Sustainable Polymers from Recycled Waste Plastics and Their Virgin Counterparts as Bitumen Modifiers: A Comprehensive Review

2021

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“…(1) Preparation of PPA/SBS modified asphalt PPA/SBS modified asphalt is made with a high-speed shearing machine. The specific test procedure was as follows (Li et al, 2021): 1) The matrix asphalt was heated to 140°C, and a certain amount of extracted oil was added and stirred evenly; 2) The evenly mixed asphalt was placed in the heating device and heated to 160°C, and the required amount of DBP was added and stirred uniformly; 3) the temperature was raised rapidly to approximately 175°C, SBS modifier was added, and the mixture was stirred thoroughly and allowed to swell for approximately 10 min; 4) the set content of PPA in the swollen modified asphalt was heated, and placed under a high-speed shearing machine to control and stabilize the temperature at approximately 175°C at 5000 r/min, and was sheared for 30 min; 5) the stabilizer was set and stirring continued for 10 min; 6) the modified asphalt was developed continuously for 2.5 h to obtain the compound asphalt required for the test.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Thereafter, it was placed on a horizontal heating frame and heated for 5 min to form a uniform asphalt film. Finally, the asphalt sample was placed in a drying dish for 12 h (Li et al, 2021).…”

Section: Sample Preparationmentioning

confidence: 99%

“…(1) Contact angle test A contact angle test is required to calculate PPA/SBS modified asphalt's adhesion performance index (cohesive work and adhesion work) (Li et al, 2021). Figure 2 shows the contact angle formed between the liquid and the asphalt sample.…”

Section: Sample Testmentioning

confidence: 99%

“…PPA/SBS modified asphalt's adhesion performance indices can be calculated from the contact angle test results; for the detailed calculation process, refer to Li et al (Li et al, 2021). The calculation equation is shown in Eqs 1, 2:…”

Section: Sample Testmentioning

confidence: 99%

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Relation Between Adhesion Properties and Microscopic Characterization of Polyphosphoric Acid Composite SBS Modified Asphalt Binder

Wang

et al. 2021

Front. Mater.

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The purpose of this study was to investigate the adhesive properties of polyphosphoric acid compounded SBS (PPA/SBS) modified asphalt. Three base asphalt binders, one SBS, one dibutyl phthalate (DBP), one furfural extraction oil, and two polyphosphoric acids (PPA), were used to produce the modified binders. The adhesive properties tested in this study included contact angle, cohesive work, adhesive work, and peak area ratio. Cohesive work and adhesive work indicators were calculated from the contact angle, the contact angle between PPA/SBS modified asphalt and three liquids (distilled water, glycerin, formamide) were tested by the contact angle tester, and the peak area ratio of the microscopic adhesion performance index by AFM. The relation between the microscopic adhesion performance characterization method (peak area ratio) and the macroscopic adhesion performance index (cohesive work, adhesion work) was established. The test results indicated that the PPA/SBS modified asphalt had the highest cohesive work and adhesion work under the conditions of 0.5% PPA, 1% DBP, 1.5% extracted oil, and 3.5% SBS, which was clearly greater than the original SBS modified asphalt, while the peak area ratio was consistent with the cohesive work and adhesive work, in which the correlation coefficient between the peak area ratio and cohesive work was 0.77788, and that between the peak area ratio and adhesion work was 0.87203. We recommend adopting the peak area ratio to characterize PPA/SBS modified asphalt’s microscopic adhesion properties.

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Insight into the diffusion behaviors of SBS‐compatibilizer‐coupled modified asphalt: Molecular dynamics simulation and experimental validation

Dong,

Lu,

et al. 2024

Vinyl Additive Technology

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Compatibilizers play a crucial role in enhancing the compatibility between styrene–butadiene–styrene (SBS) polymer and asphalt, and the coupling of compatibilizers with SBS affects the motion behavior of asphalt molecules, which influences the performance of SBS modified asphalt. In this investigation, molecular dynamics simulation is employed to evaluate the impact of SBS coupling with compatibilizers on alterations in the self‐motion behavior of asphalt molecules, changes in relative free volume, and modifications in system energy. The findings reveal that with the introduction of a compatibilizer, the combined effect of the compatibilizer and SBS coupling amplifies the mobility of the constituents within the modified asphalt. This amplification manifests as increased relative free volume within the system, heightened activation of modified asphalt molecules, and a simultaneous reduction in the interaction energy among these molecules. Following that, the high‐temperature rheological properties of SBS modified asphalt were verified with the simulation results, coupled with temperature scanning experiments. This study describes the intrinsic mechanism of interaction of compatibilizers in SBS modified asphalt at the molecular scale.Highlights Molecular dynamics simulations and experimental validation were implemented for styrene–butadiene–styrene (SBS)‐modified asphalt. Compatibilizers can activate the activity of SBS modified asphalt. Compatibilizers allow a better release of the properties of the bitumen and SBS. Compatibilizers can replace bitumen and act with SBS to improve its modification efficiency. The optimum dosage of compatibilizer is 3%.

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Evaluation of the adhesion characteristics of material composition for polyphosphoric acid and SBS modified bitumen based on surface free energy theory

Cited by 31 publications

References 33 publications

Sustainable Polymers from Recycled Waste Plastics and Their Virgin Counterparts as Bitumen Modifiers: A Comprehensive Review

Sustainable Polymers from Recycled Waste Plastics and Their Virgin Counterparts as Bitumen Modifiers: A Comprehensive Review

Relation Between Adhesion Properties and Microscopic Characterization of Polyphosphoric Acid Composite SBS Modified Asphalt Binder

Insight into the diffusion behaviors of SBS‐compatibilizer‐coupled modified asphalt: Molecular dynamics simulation and experimental validation

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