Absorptive Aggregates in Asphalt Paving Mixtures, HR-142, 1971

(1971) Absorptive Aggregates in Asphalt Paving Mixtures, HR-142, 1971. Transportation, Department of

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Abstract

In this study, the asphalt absorption of six Iowa limestones were investigated. It was found that the most important factors that determined the nature, amount, and rate of asphalt absorption are porosity and pore-size distribution of the aggregate, viscosity of the asphalt, and time. Methods needed to determine the realistic maximum and minimum asphalt absorption by aggregates are recommended. Simple methods of asphalt absorption were developed. Since the most important factor that determines the accuracy of asphalt absorption is the bulk specific gravity of aggregates and since the current ASTM method is not adequate in this respect, several new methods were developed. Preliminary treatment studies for the purpose of upgrading absorptive aggregates were conducted using close to 40 chemicals. The improvements of some of these treatments on the mixture properties were demonstrated.

Item Type: Departmental Report
Keywords: Absorption, Asphalt tests, Chemical tests, Limestone aggregates, Porosity, Specific gravity
Subjects: Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Research
Transportation > Research > Asphalt
ID Code: 17276
Deposited By: Iowa DOT Library
Deposited On: 30 Jun 2014 12:36
Last Modified: 29 Jan 2015 21:08
URI: http://publications.iowa.gov/id/eprint/17276