Development and application of asphalt binder relaxation test in different dynamic shear rheometers

Büchner, Johannes; Ryś, Dawid; Trifunović, Stefan; Wistuba, Michael P.

doi:10.1016/j.conbuildmat.2022.129929

Cited by 9 publications

(1 citation statement)

References 17 publications

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“…This study used the bending beam rheometer test to obtain the stiffness modulus S and m value of three asphalt binders, which characterise the exibility and stress relaxation properties of the three asphalts [23] . The test temperatures are − 6, −12, − 18 and − 24°C, with a test duration of 240 s and a test load of 980 mN ± 50 mN.…”

Section: Asphalt's Low-temperature Rheological Properties (Bbr)mentioning

confidence: 99%

Research on Preparation Technology of Brittle-resistant Asphalt Mixture Based on Wet-Dry Combined Modification Processes

Song,

Zheng,

Wei

et al. 2024

Preprint

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This study aims to reduce the brittle point temperature of asphalt binders and improve the low-temperature mechanical properties of mixtures by developing a brittle-resistant asphalt mixture preparation technology for use in cold regions. The SBS wet-modified asphalt was combined with the melted star-shaped SBS modifier through a dry method. During mixing and transportation, the high-temperature effect helped form a secondary cross-linking effect with part of the original SBS-modified asphalt. The rest was evenly dispersed in the form of tough fillers, effectively avoiding the segregation and high viscosity issues caused by the conventional high-dosage wet-modified SBS asphalt. Tests were conducted on the brittle point temperature of asphalt binders, oil–aggregate interface adhesion grade, high- and low-temperature rheological properties of asphalt binders and the high- and low-temperature performances of the mixture to analyse the scientific nature of the developed preparation technology. Results show that compared with the conventional wet-modified SBS asphalt, the brittle-resistant SBS-modified asphalt prepared based on the wet–dry method has a reduced brittle point temperature by nearly 6.6°C, maintains an adhesion grade of 5 at the oil-aggregate interface. Moreover, the m value increases by approximately 1.3 times, the low-temperature bending strain of the mixture increases by approximately 70%, and the low-temperature bending strength is enhanced by approximately 60%. These results demonstrate that the proposed brittle-resistant SBS-modified asphalt preparation technology significantly improves the low-temperature performance of the mixture whilst ensuring mixing quality, which is crucial for enhancing the service performance of asphalt pavements in cold regions.

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Section: Asphalt's Low-temperature Rheological Properties (Bbr)mentioning

confidence: 99%