Structural Analysis of Aggregate Blends Using the SHRP Gyratory Compactor, MLR-95-8, 1996

(1996) Structural Analysis of Aggregate Blends Using the SHRP Gyratory Compactor, MLR-95-8, 1996. Transportation, Department of

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Abstract

The Iowa Department of Transportation (IDOT) received a Strategic Highway Research Program (SHRP) gyratory compactor in December 1994. Since then IDOT has been studying the ability of the compactor to analyze fundamental properties of aggregates such as shape, texture, and gradation by studying the volumetrics of the aggregate blends under a standard load using the SHRP gyratory compactor. This method of analyzing the volumetrics of aggregate blends is similar to SHRP's fine aggregate angularity procedure, which analyzes void levels in noncompacted aggregate blends, which in turn can be used to evaluate the texture or shape of aggregates, what SHRP refers to as angularity. Research is showing that by splitting the aggregate blend on the 2.36-mm (#8) sieve and analyzing the volumetrics or angularity of the separated blend, important fundamental properties can be determined. Most important is structure (the degree and location of aggregate interlock). In addition, analysis of the volumes of the coarse and fine portions can predict the voids in the mineral aggregate and the desired asphalt content. By predicting these properties, it can be determined whether the combined aggregate blend, when mixed with asphalt cement, will produce a mix with structural adequacy to carry the designed traffic load.

Item Type: Departmental Report
Keywords: Aggregate gradation, Aggregates, Aggregates by shape and surface texture, Angularity, Asphalt content, Asphalt mixtures, Coarse aggregates, Compactors, Fine aggregates, Interlocking aggregates, Mineral aggregates, Properties of materials, Structural analysis, Texture, Void ratios, Volumetric analysis
Subjects: Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Roads and highways
Transportation > Research
Transportation > Research > Concrete
ID Code: 16819
Deposited By: Iowa DOT Library
Deposited On: 07 May 2014 11:49
Last Modified: 07 Jan 2015 21:16
URI: http://publications.iowa.gov/id/eprint/16819