Tarrahan Parseh Transportation Research Institute International Journal of Transportation Engineering 2322-259X 13 3 2026 01 01 Investigation of the Skid Resistance and Mechanical Properties of Concrete Based on Aggregate Characteristics and Cement-Paste Film Parameters 2253 2275 236806 10.22119/ijte.2025.554837.1715 EN Nasrin Karimi Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran Abolfazl Arabzade Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran Seyedehsan Seyedabrishami Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran 0000-0002-9301-5417 Journal Article 2025 10 24 <span>Maintaining pavement friction under wet conditions requires surface textures that withstand traffic-induced polishing and wear. This study evaluates how the coordinated adjustment of maximum aggregate size (MAS), aggregate gradation, packing density, paste film thickness (PFT), and mortar film thickness (MFT) governs skid resistance in slip-formed concrete pavements. Twenty mixtures were produced with Modified Fuller–Thompson exponents (0.67, 0.55, 0.45, 0.35) at MAS = 9.5, 12.5, 19, 25, and 37.5 mm. Tests included slump and Box Test, wet packing density, PFT/MFT, compressive and flexural strength, EN 1338 abrasion, ASTM E303 British Pendulum Number (BPN), Mercury Intrusion Porosimetry (MIP), and Scanning Electron Microscopy (SEM) of the Interfacial Transition Zone (ITZ). The results indicate that mixtures with MAS = 19–25 mm provided the best overall balance—higher compressive and flexural strengths, BPN typically ≥ 65, and lower abrasion rates. The study indicates that coordinating packing density with PFT and MFT—within a compatible gradation—enhances mechanical properties as well as skid resistance.</span> http://www.ijte.ir/article_236806_af35d7ea27e2f4545083701ee2905465.pdf