Abstract
Tourmaline modified asphalt (TMA) was prepared by melt-blending process. The modified effect of tourmaline on base asphalt was studied systematically by penetration test, softening point test, ductility test and bending beam rheometer (BBR) test. Based on this, the chemical components of the samples were tested and the colloidal structures of the asphalt were analyzed. Experimental results showed that the temperature susceptibility of asphalt could be improved significantly with the addition of tourmaline. Softening point test revealed that the softening point of TMA was constantly increased with the increasing amount of tourmaline. BBR test indicated that the low temperature properties of asphalt were improved with the addition of tourmaline. The colloidal structure of the asphalt was not changed due to the addition of tourmaline, remaining Sol-Gel type, and a stronger stability happened with the increasing mixing amount of tourmaline.
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