The influence of recycled asphalt pavement materials on low and intermediate fracture behavior of asphalt concrete (AC) after exposing to different thawing and freezing periods

Jafari Haghighatpour, Pegah; Aliha, M.R.M.

doi:10.1016/j.engfracmech.2023.109715

Cited by 5 publications

(1 citation statement)

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“…Asphalt concrete [ 1 , 2 , 3 ], a major road construction material, frequently encounters issues like degradation, cracking, and fatigue under harsh climatic conditions and traffic pressure [ 4 , 5 ]. To enhance road durability and safety, researchers have been exploring new methods and materials to augment the performance of asphalt concrete.…”

Section: Introductionmentioning

confidence: 99%

Study of the Cold Curing Characteristics of Isocyanate-Modified Asphalt

Zhou,

Peng,

Yang

et al. 2024

Materials

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Isocyanate esters are widely recognized for their superior curing capabilities. Leveraging this attribute, the current research formulated a modified cold-mixed asphalt blend using 4,4′-methylene diphenyl diisocyanate (MDI). Tests and analyses of the MDI-modified asphalt with varying inclusion percentages of MDI revealed that a mixture containing 15% rock asphalt and 15% MDI-modified asphalt exhibited a more balanced, comprehensive performance. We also conducted an examination of the role and properties of MDI in asphalt modification using molecular dynamics simulations. The cold-curing properties of MDI-modified asphalt as compared to petroleum asphalt were evaluated based on its density, free volume analysis, cohesive energy density, and glass transition temperature. Implementing the LB-13 gradation—a cold-mixed asphalt gradation with a nominal particle size of 13.2 mm recommended by Chinese specifications—we prepared MDI-modified cold-mixed asphalt and carried out analyses of its mechanical characteristics, high-temperature performance, and water damage resistance. The results demonstrated that MDI-modified asphalt showcases excellent ductility, flexibility, and aging resistance, surpassing the performance of petroleum asphalt. The stability, high-temperature rutting, and water damage resistance of the MDI-modified cold-mixed asphalt exceeded the requirements for hot-mixed asphalt. This research provides theoretical and experimental support for isocyanate ester applications in asphalt engineering, presenting significant value for practical engineering applications.

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