Physical-Mechanical Properties of Asphalt Mixtures Modified with Polymers and Adhesion Additive, District of Máncora – Peru

The limited implementation of advanced technologies in Peru highlights the necessity of enhancing asphalt mixture performance, especially in response to rising environmental demands and traffic intensity. This study investigates enhancing hot mix asphalt (HMA) by adding styrene-butadiene-styrene (SBS) polymers and a chemical adhesion agent, with the goal of optimising essential physical and mechanical properties, including bending flexibility, fatigue resistance, and rutting performance. The objective was to determine the optimal SBS polymer and adhesion additive contents in a mixture modified with PG76-10 asphalt binder, based on laboratory testing. A deductive, applied, and quantitative methodology was adopted, and the research design was descriptive, correlational, and explanatory, with an experimental, longitudinal, and prospective approach. The optimal formulation was found to comprise 5.7 % PG76-10 binder, 3.0 % SBS polymer, and 0.5 % adhesion additive. This achieved a Marshall stability of 1977 kg, a permanent deformation of 4.45 mm, and a tensile strength ratio (TSR) of 84.9 %. In terms of elasticity, the dynamic modulus reached 1901 MPa at 25 Hz and 54℃, indicating high stiffness under rapid loading, while fatigue resistance reached 2.32 million cycles at 400 με, supported by the predictive model (R² = 0.999). The results confirm that the modified asphalt mixture meets the fundamental technical requirements for hot mix asphalt applications, showing significant improvements in rutting resistance, elastic recovery, and fatigue performance.