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Yellowstone River Gravels.

PB263677

Publication Date	1975
Personal Author	Weber, S. F.; Braut, A.
Page Count	92
Abstract	The purpose of this investigation was to develop a grading specification that would provide a more satisfactory pavement and be more compatible with source characteristics so they would lessen production and construction difficulties. Conservation of materials, cost savings, decreased asphalt requirements, higher friction surfaces, and mineral filler elimination were associated benefits that appeared to be realizeable as the study progressed. Bituminous pavement mixtures using Yellowstone River aggregates exhibited characteristics associated with over-sanding when produced under the Standard Specifications. This specification nominally limited the -40M fraction to a maximum of 25%, however waivers generally allowed 30% and this figure was often exceeded in production. The high sand fraction in turn required a substantial proportion of fine particles (-80 & -200M) to fill void spaces in the sand. In order to ascertain gradation characteristics of the natural gravel deposits, several sites along the river were chosen for statistical analyses. Data was taken from the files of completed projects which were located at more or less equal distances apart and which provided a large number of samples.
Keywords	Gravel Aggregates Flexible pavements Particle size Laboratory tests Field tests Performance evaluation Variations Extrusive rocks Cost estimtes Specifications Crushing Granulation Yellowstone River Montana
Source Agency	Federal Highway Administration
NTIS Subject Category	50A - Highway Engineering 50C - Construction Equipment, Materials, & Supplies 48A - Mineral Industries
Corporate Authors	Montana State Highway Dept., Helena. Materials Bureau.; Federal Highway Administration, Washington, D.C. Materials Div.
Document Type	Technical Report
Title Note	Final rept. 1972-1975.
NTIS Issue Number	197711

Yellowstone River Gravels.

Yellowstone River Gravels.
PB263677

Publication Date	1975
Personal Author	Weber, S. F.; Braut, A.
Page Count	92
Abstract	The purpose of this investigation was to develop a grading specification that would provide a more satisfactory pavement and be more compatible with source characteristics so they would lessen production and construction difficulties. Conservation of materials, cost savings, decreased asphalt requirements, higher friction surfaces, and mineral filler elimination were associated benefits that appeared to be realizeable as the study progressed. Bituminous pavement mixtures using Yellowstone River aggregates exhibited characteristics associated with over-sanding when produced under the Standard Specifications. This specification nominally limited the -40M fraction to a maximum of 25%, however waivers generally allowed 30% and this figure was often exceeded in production. The high sand fraction in turn required a substantial proportion of fine particles (-80 & -200M) to fill void spaces in the sand. In order to ascertain gradation characteristics of the natural gravel deposits, several sites along the river were chosen for statistical analyses. Data was taken from the files of completed projects which were located at more or less equal distances apart and which provided a large number of samples.
Keywords	Gravel Aggregates Flexible pavements Particle size Laboratory tests Field tests Performance evaluation Variations Extrusive rocks Cost estimtes Specifications Crushing Granulation Yellowstone River Montana
Source Agency	Federal Highway Administration
NTIS Subject Category	50A - Highway Engineering 50C - Construction Equipment, Materials, & Supplies 48A - Mineral Industries
Corporate Authors	Montana State Highway Dept., Helena. Materials Bureau.; Federal Highway Administration, Washington, D.C. Materials Div.
Document Type	Technical Report
Title Note	Final rept. 1972-1975.
NTIS Issue Number	197711