SUPERPAVE RHEOLOGICAL BITUMEN APPLICATION IN UZBEKISTAN: A REVIEW OF PERFORMANCE-BASED CHARACTERIZATION, MODIFIED BINDER RHEOLOGY, AND STRUCTURAL VALIDATION.
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Abstract
The Republic of Uzbekistan stands at a critical juncture in the development of its transportation infrastructure. The transition from empirical standards to mechanistic-based design protocols represents not merely a technical upgrade, but a fundamental paradigm shift required to ensure the longevity and durability of the national road network against the backdrop of an extreme continental climate. This comprehensive review article provides a rigorous examination of the application of Superpave (Superior Performing Asphalt Pavements) rheological methodologies for the characterization of bituminous binders and asphalt mixtures. We synthesize extensive experimental data covering the transition from traditional GOST-based penetration grading to the Performance Grade (PG) system, with a specific focus on the rheological behavior of polymer-modified bitumen and PG 64-40 binders suitable for Uzbekistan's thermal extremes. Furthermore, the review bridges the gap between binder rheology and structural performance through a detailed analysis of dynamic modulus master curve construction and the validation of advanced three-dimensional Finite Element Models (FEM). By integrating data on viscoelastic properties, non-Newtonian flow characteristics, and mechanistic structural responses, this report establishes a scientific roadmap for the implementation of performance-based specifications in Uzbekistan, aiming to mitigate prevalent distresses such as high-temperature rutting and low-temperature thermal cracking.
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