Validation of Gyratory Mix Design in Iowa

Williams, R. Christopher; Buss, Ashley F.; Mercado, Grace; Lee, Hosin David; Bozorgzad, Ashkan

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Validation of Gyratory Mix Design in Iowa

2016-07-01
By Williams, R. Christopher ; Buss, Ashley F. ; Mercado, Grace

File Language:

English

Details

Creators:

Williams, R. Christopher ; Buss, Ashley F. ; Mercado, Grace ; Lee, Hosin David ; Bozorgzad, Ashkan
Corporate Creators:

Iowa State University. Institute for Transportation
Corporate Contributors:

Iowa. Highway Research Board ; Iowa. Dept. of Transportation ; United States. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

IHRB Project TR-667;InTrans Project 14-492
Resource Type:

Tech Report
Geographical Coverage:

United States;Iowa
Edition:

Final report
Corporate Publisher:

Iowa State University. Institute for Transportation
Abstract:

The design number of gyrations (Ndesign) introduced by the Strategic Highway Research Program (SHRP) and used in the Superior Performing Asphalt Pavement (Superpave) mix design method has been commonly used in flexible pavement design throughout the US since 1996. Ndesign, also known as the compaction effort, is used to simulate field compaction during construction and has been reported to produce air voids that are unable to reach ultimate pavement density within the initial 2 to 3 years post-construction, potentially having an adverse impact on long-term performance. Other state transportation agencies have conducted studies validating the Ndesign for their specific regions, which resulted in modifications of the gyration effort for the various traffic levels. Validating this relationship for Iowa asphalt mix designs will lead to better correlations between mix design target voids, field voids, and performance. A comprehensive analysis of current Ndesign levels investigated the current levels with existing mixes and pavements and developed initial asphalt mix design recommendations that identify an optimum Ndesign through the use of performance data tests.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/36923/dot_36923_DS1.pdf
File Type:

[PDF - 2.77 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:4848ffea94701f1ab00656e24fa317af38327d2940868f779e1a6af2dc7a591c47cdf14fdc1c288a2a349bbe31ad5b0ee2e4f17ed668eceec6f86f7bc884d8f2

File Language:

English

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