Author: Thomas Bennert
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 286

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Author: Christopher L. Ericson
Publisher:
ISBN:
Category : Gravel
Languages : en
Pages : 168

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Book Description
The current aggregate requirement for aggregate angularity that the NYSDOT requires for their Superpave Hot Mix Asphalt (HMA) is 100/98. With this requirement, many of the gravel quarries in New York State cannot meet that specification. As a result, quarries that are further away from the job site have to transport the aggregates which in turn increases the cost of construction. This paper investigates a multitude of test methods to determine whether the NYSDOT can further lower their Superpave aggregate angularity requirement. Also, this paper delves into "grade bumping."

Author: Brian D. Prowell
Publisher: Transportation Research Board
ISBN: 0309088259
Category : Technology & Engineering
Languages : en
Pages : 101

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Author: Erich M. Purcell
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 98

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With the recent introduction and acceptance of Superpave design criteria for hot mix asphalt, designers have had difficulty meeting the minimum voids in the mineral aggregate (VMA) requirements. VMA is affected by compactive effort, gradation, and aggregate angularity. This research focused on the effects of fine aggregate angularity on VMA and rutting. Two 12.5-mm Superpave gradations, one coarse and one fine, were developed using 100% crushed limestone. Once the baseline gradations were established, laboratory samples were produced with increasing natural sand percentages. The percentage of natural sand directly replaced the limestone on each sieve allowing the gradation to remain constant and the effect of fine aggregate angularity to be observed independent of gradation. The resultant VMA and fine aggregate angularity of each blend was compared. In an effort to meet Superpave criteria, designers in Kansas have been using chat sand, a flaky fine aggregate of almost pure silica that is a byproduct of lead and zinc mining, to boost VMA.

Author: Asphalt Institute
Publisher:
ISBN: 9781934154175
Category : Asphalt
Languages : en
Pages : 102

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Author: Donald W. Christensen
Publisher: Transportation Research Board
ISBN: 030909867X
Category : Asphalt
Languages : en
Pages : 57

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TRB's National Cooperative Highway Research Program (NCHRP) Report 567: Volumetric Requirements for Superpave Mix Design examines whether changes to the recommended Superpave mix design criteria for voids in mineral aggregate, voids filled with asphalt, and air voids content might further enhance the performance and durability of hot-mix asphalt.

Author: Leonardo T. Souza
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 180

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Author:
Publisher: Transportation Research Board
ISBN: 0309155649
Category : Asphalt concrete
Languages : en
Pages : 285

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Author: N. Pau Khosla
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 94

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Strategic Highway Research Program (SHRP) A407 recommends that aggregate gradations pass below the restricted zone as traffic level increases. This study investigated the use of natural sand in the fine and coarse gradations for the surface course mixtures. The mixtures were designed using the SUPERPAVE mix design approach and were evaluated for their performance in terms of resistance to rutting, fatigue and moisture damage. In addition, the accelerated performance of these mixtures was also evaluated using the Asphalt Pavement Analyzer.

Author:
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 80

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