Evaluation of Tack Coat Bond Strength Tests

Shuler, Scott; Colorado. Dept. of Transportation. Research Branch; Colorado State University

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Evaluation of Tack Coat Bond Strength Tests

2018-05-01
By Shuler, Scott

[PDF-668.77 KB]

English

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Details:

Creators:

Shuler, Scott
Corporate Creators:

Colorado. Dept. of Transportation. Research Branch ; Colorado State University

Colorado. Dept. of Transportation. Research Branch ; Colorado State University Less -
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Asphalt Overlays Bond Strength Bond Strength (Materials) Overlays (Pavements) Tack Coat Tack Coats
Publication/ Report Number:

CDOT-2018-14
Resource Type:

Tech Report
Geographical Coverage:

Colorado
Corporate Publisher:

Colorado. Dept. of Transportation. Applied Research and Innovation Branch
NTL Classification:

NTL-HIGHWAY/ROAD TRANSPORTATION-Materials
Abstract:

Poor bonding between asphalt pavement overlays and the substrate pavement layer can greatly influence the long term performance of hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by using an asphalt emulsion tack coat. Additionally, field staff is charged with determining whether an existing pavement, especially a milled surface, is clean enough prior to tack coat placement, to ensure an adequate bond. Because CDOT is prescriptive in its tack coat application specifications, responsibility for any pavement failures related to poor bonding lies with CDOT. However, if a performance related test to measure tack coat bond strength could be specified, failures related to poor bonding should be reduced. This study evaluated four bond strength tests for SMA and HMA overlays on HMA and Portland cement concrete pavements. Results of this study indicate that bond strength of HMA overlays can be measured using pavement cores, that a significant difference in test precision was observed when CRS-2P was used a tack coat and that one of the test pavements demonstrated significantly poorer than recommended bond strength for the tack coat utilized. Recommendations are provided for developing a performance related specification based on future performance observed on the four pavements. Implementation of this research can be done as follows: 1) specify a minimum tack coat application rate of 0.05 gal/sq-yd of 50:50 diluted CSS-1h or CRS-2P for construction of dense graded HMA over other dense graded HMA.
Content Notes:

Sponsoring Agency Code Study #12.94 Performing Organization Report No. CDOT-DTD-R-2018-14
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:2bc656db4f98c29348388418a9976a51ef7cb0250dd8a7327c1193239c9bcc3b
Download URL:

https://rosap.ntl.bts.gov/view/dot/36106/dot_36106_DS1.pdf
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Evaluation of Tack Coat Bond Strength Tests

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