Evaluating the Performance and Fume Suppression Effect of Tourmaline-Modified Asphalt

This study prepared samples of fume-suppressing asphalt to improve the eco-friendly char-acteristics of pavement construction. Various quantities and mesh sizes of tourmaline powder were used in modified asphalt samples. The conventional performance test, multiple stress creep recovery test, linear amplitude sweep test, and bending beam rheometer test were used to analyze the asphalt's properties at high, medium, and low temperatures, and the fume sup-pression effect was evaluated using a homemade asphalt fume generation and enrichment device. The study's results indicate that as the mesh size and quantity increased, the penetra-tion of the modified asphalt decreased, the softening point increased, and ductility first in-creased before decreasing. The larger the mesh size and tourmaline quantity, the better the improvement effect of the tourmaline powder on the asphalt's high-and low-temperature performance. Tourmaline powder has a good inhibitory effect on the release of asphalt fume, and when the quantity of tourmaline powder at 800 mesh and 1250 mesh exceeded 16 % of the base asphalt, the change rate significantly influenced the fume suppression rate. Overall, the influence of tourmaline powder on the performance and fume suppression of asphalt was high-est when the quantity was 14 % with 1250 mesh.