Determination of optimum dosage of high-viscosity-modified asphalt based on silane-coupling-agent-modified montmorillonite/SBS/HVA blends and its performance
Using the Box-Behnken's response surface method and taking the dosages of silane-coupling-agent-modified montmorillonite,SBS,and high viscosity agent(HVA)as influence factors for asphalt,a model was established to de-termine the optimal dosages of three types of raw materials in the asphalt based on the Brinell viscosity at 170 ℃ as an evaluation criterion.The results indicated that the high-viscosity-modified asphalt containing 5 wt％SBS,9 wt％HVA,and 8 wt％modified montmorillonite exhibited the best performance,and its penetration,ductility,softening point,and Brinell's viscosity at 170 ℃ were determined to be 4.52 mm,42.9 cm,86.1 ℃,and 2.371 Pa·s,respectively.Dynamic shear and Brinell's viscosity tests show that,compared to the pristine asphalt and the high-viscosity-modified asphalt TPS,the addition of modified montmorillonite greatly improved the high-temperature performance and rutting resistance of asphalt,resulting in a significant improvement in the viscosity.The functional groups were analyzed by Fourier-trans-mission infrared spectroscopy.The disappearance of the vibration peaks indicated that the silane coupling agent involved a chemical reaction with montmorillonite in the modification process.
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