Adding Dust Collector Fines to Asphalt Paving Mixtures

摘要

This report documents the results of a study on the characteristics and variability of baghouse dust collected from asphalt plants throughout the United States. Samples were collected from plants representative of different plant types (drum and batch), generic aggregate types, and dust collection systems. The day-to-day and within-day variability in dust properties is primarily a function of the efficiency of the primary dust collector. Little variability was observed in the gradation characteristics of the fine fraction of the baghouse dust. Variations in the dust in an asphalt mixture are more likely to be due to the dust handling system than to inherent variations in the dust. Proper design of the dust handling system will minimize variations in the dust in asphaltic concrete mixtures. Guidelines for the proper handling of dust are presented.