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Title:

Quantification of Thermal Uniformity for Asphalt Paving Using the Thermal Segregation Index

Accession Number:

01838034

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/issn/03611981

Abstract:

Thermal and mechanical segregation are significant asphalt paving issues that affect the quality of asphalt pavements. Both types of segregation can be caused by inadequate mix material production, material delivery, and paving operation. Severe segregation results in lower in-place asphalt densities, which affect pavement performance. Measuring thermal segregation with technology such as paver mounted thermal profiling (PMTP) is critical to ensuring pavement quality. PMTP can continuously measure surface temperature profiles behind the trailing edge of a paver screed with an infrared sensor or photogrammetry. PMTP can also track paver speeds, stop locations, and stop durations. The differential range statistic (DRS) was created in the 2000s to evaluate thermal segregation. However, the DRS does not always adequately capture narrow bands of longitudinal thermal segregation caused by poor auger extension setup, mix building up beneath the reverse auger box and/or slat conveyors, worn deflector plates, and so forth. This paper introduces the thermal segregation index (TSI), which combines overall 2D sublot thermal uniformity and lateral thermal uniformity to overcome DRS’ shortcomings. The TSI combines the transverse semivariogram index (TSVI) and standard deviation (StDev) for sublots of 45.7?m (150?ft) in length. TSVI represents the lateral thermal uniformity in the transverse direction, while StDev represents the overall sublot temperature variation and is comparable with the DRS method. The TSI method was validated with an extensive thermal profile database and implemented in the Veta software allowing agencies and contractors to identify thermal segregation reliably and timely to conduct adequate corrective actions to resolve mix and paving issues.

Supplemental Notes:

George K. Chang https://orcid.org/0000-0002-4945-8827 © National Academy of Sciences: Transportation Research Board 2022.

Language:

English

Authors:

Tanquist, Bruce
Embacher, Rebecca
Chang, George K

ORCID 0000-0002-4945-8827

Dick, Jason

Pagination:

pp 608-616

Publication Date:

2022-7

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2676
Issue Number: 7
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (10)

Subject Areas:

Construction; Highways; Pavements

Files:

TRIS, TRB, ATRI

Created Date:

Feb 27 2022 3:01PM