Materials for Civil and Construction Engineers (4th Edition)
Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 9, Problem 9.36QP
To determine

The optimum asphalt content using the Asphalt Institute design criteria.

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An asphalt concrete mixture is to be designed according to the Marshall procedure. A PG 64-22 asphalt cement with a specific gravity (Gb) of 1.00 is to be used. A dense aggregate blend is to be used, with a maximum aggregate size of 3/4 in. and a bulk specific gravity (Gsb) of 2.786. The theoretical maximum specific gravity of the mix (Gmm), at asphalt content of 4.5%, is 2.490. Trial mixes were made with average results as shown in Table . Using a spreadsheetprogram, plot the appropriate six graphs necessary for the Marshall procedure and select the optimum asphalt content, using the Asphalt Institute design criteria for medium traffic(see Table . Assume a design air void content of 4% when using Table
The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gb) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gsb) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt content of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table:Determine the design asphalt content using the Asphalt Institute design criteria formedium traffic Table . Assume a design air void content of 4% when usingTable
The mixture maximum specific gravity at 5.0 % asphalt binder content is 2.495. The asphalt specific gravity is 1.030. Compute the aggregate effective specific gravity. Estimate the mixture maximum specific gravity at 6.0 % asphalt binder content.
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