Asbestos Fibers in Type B Asphaltic Concrete Surface Course, MLR-67-1, 1968

(1968) Asbestos Fibers in Type B Asphaltic Concrete Surface Course, MLR-67-1, 1968. Transportation, Department of


File Size:756kB


The Standard Specifications for this project included requirements for placing two 500 foot test sections of Type B asphaltic concrete with 1-1/2 per cent asbestos fibres (mix size 3/8 inch, lift thickness 3/4 inch) as part of the regular construction of the surface course. These requirements were designed to provide asbestos modified mixtures for laboratory analysis and road performance evaluation. This report provides the preliminary results and analysis of test data obtained from tests on the mixtures placed on the roadway. Previous research by G. S. Zuelke (1) and J. H. Kestzman et al (2) indicated that asphaltic concrete mixtures modified with asbestos fibres improved stability, decreased permeability, and allowed the use of higher bitumen contents. This study indicated that the addition of asbestos fibres would permit the use of higher bitumen contents, theoretically improving durability, without adverse results. An indication was also obtained to the effect that asbestos mixtures were more difficult to compact in the field.

Item Type: Departmental Report
Keywords: Admixtures, Asbestos, Asphalt Concrete, Durability tests, Fibers
Subjects: Transportation > Pavements
Transportation > Pavements > Asphalt
Transportation > Roads and highways
Transportation > Research
Transportation > Research > Concrete
Transportation > Design and Construction
ID Code: 17128
Deposited By: Iowa DOT Library
Deposited On: 06 Jun 2014 17:48
Last Modified: 15 Jan 2015 12:41