Abstract
This study investigates the impact of polymer dispersion characteristics and incorporation methods on the polymer modified asphalt emulsion (PMAE) characteristics and, consequently, on the properties of Cement Asphalt Mortar (CAM) for high-speed rail tracks. The results showed that latex-form polymer dispersions with anionic charge and coagulation values below 1 % after 30 minutes provided stable mortars with shorter flow times. Mortar with PMAE produced through terminal blending (TB) method exhibited superior workability characteristics compared to those produced via soap pre-batch (S) and co-milling (C) methods. Differential Scanning Calorimetry (DSC) studies indicated improved polymer integrity in the CAM when produced with PMAE:TB. Mortar containing PMAE:C found to have the highest compressive strengths, with values of 1.49 MPa at 7 days and 2.32 MPa at 28 days, followed by PMAE:S, PMAE:TB, and the control asphalt emulsion (AE). Thermogravimetric Analysis (TGA) results on hydrated CA paste were consistent with the compressive strength trend, and Field Emission Scanning Electron Microscopy (FESEM) analysis revealed a more uniform polymer distribution in TB method. The study concludes that anionic polymer dispersions having low coagulation values introduced through terminal blending are most suitable for CAM production.
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