Comparison of various methods to determine bulk specific gravity of cores : an investigation of high values using AASHTO T275 – paraffin-coated method.

Schroer, Joe; Missouri. Department of Transportation

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

i

Comparison of various methods to determine bulk specific gravity of cores : an investigation of high values using AASHTO T275 – paraffin-coated method.

2012-07-01
By Schroer, Joe

English

Details You May Also Like

Details:

Creators:

Schroer, Joe
Corporate Creators:

Missouri. Department of Transportation
Subject/TRT Terms:

[+]

Asphalt Mixtures Asphalt Pavements Cores (Specimens) Paraffin Paraffin Wax Pavements, Asphalt--Testing Specific Gravity Test Procedures
Publication/ Report Number:

CMR 13-002
Resource Type:

Tech Report
Geographical Coverage:

Missouri
Edition:

Final report.
Corporate Publisher:

Missouri. Department of Transportation
Abstract:

A report from a MoDOT asphalt paving project was that unexpected results were obtained when adhering to the standard for determination of bulk specific gravity of compacted asphalt mixture (Gmb) specimens, AASHTO T 166. The test method requires specimens with water absorption greater than 2.0 percent be retested according to either AASHTO T 275, bulk gravity using paraffin-coated specimens, or T 131, bulk gravity using the automatic vacuum sealing method (CoreLok.) The contractor chose to perform T 275 and obtained bulk specific gravities of the cores higher than originally obtained. A limited investigation into the method was performed. The result of this investigation confirmed the contractor’s results and a recommendation that specimens dipped in paraffin be prohibited as an allowable test method. It was determined that paraffin entering the pore structure of the cores resulted in falsely high bulk specific gravity values.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:edb3ae0562893e095f06dbf18a818d55fa7c211957b1e20cb102e28e6cbab1c3
Download URL:

https://rosap.ntl.bts.gov/view/dot/25605/dot_25605_DS1.pdf
File Type:

[PDF-474.58 KB]