A Comparative Evaluation of CoreLok Device in Determining Reliable Bulk Specific Gravity and Maximum Specific Gravity Test Results

Rajagopal, Arudi; Crago, Dan; University of Cincinnati. Dept. of Civil and Environmental Engineering; American Association of State Highway and Transportation Officials

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A Comparative Evaluation of CoreLok Device in Determining Reliable Bulk Specific Gravity and Maximum Specific Gravity Test Results

2007-04-01
By Rajagopal, Arudi ; Crago, Dan

[PDF-666.33 KB]

English

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Details:

Creators:

Rajagopal, Arudi ; Crago, Dan

Rajagopal, Arudi ; Crago, Dan Less -
Corporate Creators:

University of Cincinnati. Dept. of Civil and Environmental Engineering ; American Association of State Highway and Transportation Officials

University of Cincinnati. Dept. of Civil and Environmental Engineering ; American Association of State Highway and Transportation Officials Less -
Corporate Contributors:

United States. Federal Highway Administration. Office of Research and Development ; Ohio. Dept. of Transportation

United States. Federal Highway Administration. Office of Research and Development ; Ohio. Dept. of Transportation Less -
Subject/TRT Terms:

[+]

Air Voids Bulk Specific Gravity Compaction Confidence Intervals Corelok Device Data And Information Technology Highways Hot Mix Asphalt Hot Mix Paving Mixtures I31: Bituminous Binders And Materials Materials Maximum Specific Gravity Sealing (Technology) Specific Gravity Statistical Analysis Testing Testing Equipment Test Procedures Vacuum Sealing
Publication/ Report Number:

FHWA/OH-2007/07
Resource Type:

Tech Report
Geographical Coverage:

United States ; Ohio

United States ; Ohio Less -
TRIS Online Accession Number:

1053633
Edition:

Final Report
Corporate Publisher:

United States. Federal Highway Administration
Abstract:

This study was initiated to systematically compare the specific gravity values of laboratory compacted Hot Mix Asphalt (HMA) mixtures using American Association of State Highway and Transportation Officials (AASHTO) and vacuum sealing procedure (using CoreLok device). In this comparative evaluation program, a series of bulk and maximum specific gravity tests were conducted using CoreLok as well as AASHTO procedures on laboratory compacted HMA mixtures. The asphalt mixtures, aggregate types and compaction levels selected to prepare the samples truly represented Ohio's materials and construction practices. A thorough statistical analysis of the data was conducted. The test results revealed that the maximum specific gravity (G mm) values obtained by both the test procedures (CoreLok and AASHTO) are statistically similar at a confidence interval of 95%. The bulk specific gravity (Gmb) values obtained using the CoreLok test procedure are always lower than the AASHTO (Gbmb) values and the difference is statistically significant. It was also noted that, the difference in G sub mb values between the two procedures is statistically significant regardless of the type of mix, type of aggregate and compaction level. Air voids values estimated using the CoreLok device are always greater than corresponding AASHTO values. In general, the difference in air voids is 1-2% with a maximum of 4.5% for a gap graded mix. The difference in air void content obtained from the two procedures is statistically significant at 95% confidence interval. There could be potential advantages in specifying this device in terms of reduced testing time. If the Ohio Department of Transportation intends on using the CoreLok, it is recommended not to change its current specification which is based on historical data and instead use an appropriate correlation factor to relate the CoreLok and AASHTO values.
Format:

PDF
Funding:

134187
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:80ca21e6b8d431de5730092cdc977bdae73b529efb235de960c6f10dc05bdff4
Download URL:

https://rosap.ntl.bts.gov/view/dot/37641/dot_37641_DS1.pdf
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A Comparative Evaluation of CoreLok Device in Determining Reliable Bulk Specific Gravity and Maximum Specific Gravity Test Results

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