Emission Reduction Performance of Modified Hot Mix Asphalt Mixtures

Table 1

Characteristics of basic materials.

Basic materials	Crystal structure	Shape	Symmetry	Joint	Relative density (g/cm^3)	Emission reduction principle	Compatibility with asphalt	Side effect
T	Trigonal crystal	Columnar	Noncentrosymmetric	No joint	3.03–3.05	Physical adsorption, reductive degradation	Good	No toxic effect
P	Isometric system	Fine disseminated	Noncentrosymmetric	Not completely	4.9	Chemical adsorption, reductive degradation	Good	No toxic effect
S	Trigonal system	Schistose	Noncentrosymmetric	No joint	5.0–5.3	Physical adsorption, reductive degradation	Good	No toxic effect