Study on the Computing Method of Asphalt Absorption Coefficient in the Effective Relative Density of Aggregate

Abstract

According to the computing formula of the effective relative density of aggregate and its physical significance, the theoretical computing formula of asphalt absorption coefficient C has been deduced through the Four-phase system theory of aggregate, and the rationality of asphalt absorption coefficient has been verified through testing and comparison with other computing methods. It is concluded that: (1) the asphalt absorption coefficient is between 0.2 and 0.8 when the water absorptivity of aggregate is between 0.5% and 4.0%; (2) the formula of asphalt absorption coefficient should includes bulk relative density of aggregate; (3) when the water absorptivity of aggregate goes up, the impact exerted by the bulk relative density of aggregate upon the asphalt absorption coefficient would be greater accordingly.