Asphalt Cement Consistency Study:Field Evaluation of Viscosity and Penetration Graded Asphalt Cements.

摘要

The report is concerned with the comparative evaluation of durability and field performance of penetration and viscosity graded asphalt cements from four suppliers. The principal findings summarized below are based on 60month service of sections constructed with these asphalts: (1) The hardening of asphalt cements is a hyperbolic function of time; (2) Asphalt cements with original high viscosity tend to harden more and at a rapid rate; (3) There was no significant difference in durability between the two types of asphalts. Likewise,for a given source,there was no recognizable difference in their performance in pavements, (4) by all durability criteria,asphalts one grade softer than the harder viscosity graded asphalts are more durable and sections constructed with these softer grade asphalts are performing better than any other harder grade asphalts after 60months of service, (5) there was no association between the high temperature susceptible viscosity graded asphalts and pavement performance. Likewise,there was no association between voids in pavement and rate of asphalt hardening.