Research on the Application of RAP Fine Aggregate Based on HMAC Design Concept

• DOI: 10.20944/preprints202408.1053.v1
• Publication Date: 2024-08-15T00:19:37Z
• Authors: Kou Xiao
• Keywords: Dynamic shear rheometer; Ductility (Earth science); Asphalt concrete

In order to apply RAP fine aggregate High Modulus Asphalt Concrete(HMAC), this study first extracts aged asphalt from through extraction and distillation, adds it high modulus modified in proportions of 20%, 40%, 60%, 80%. The performance changes the recycled were investigated using conventional tests dynamic shear rheological (DSR). Microscopic techniques such as four‐component analysis infrared spectroscopy employed explain macroscopic terms component functional group asphalt. Using HMAC‐20 gradation an example, uniaxial compression tests, rutting freeze‐thaw splitting low‐temperature bending conducted evaluate mixture with different contents four indices: modulus, stability, tensile strength ratio (TSR), maximum strain. results indicate that for every 20% increase asphalt, penetration at 25°C, ductility viscosity 60°C decrease by approximately 6.2%, 15.4%, 3.9%, respectively, while softening point increases 13.3%. It is concluded addition significantly affects 25°C point. As content increases, complex (G*) phase angle (δ) decrease, factor increases. demonstrate incorporation merely a physical blending phenomenon, involving components without formation new groups (new peaks). When applied mixture, compared mixtures exhibit higher but reduced water stability performance.