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Title:

Best Practices for implementation of Tack Coat: Laboratory Testing

Accession Number:

01476024

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The main objective of this study was to evaluate the performance of various tack coats and determine the optimum residual application rates for three pavement surfaces: unmilled aged nontrafficked, milled aged, and unmilled aged trafficked asphalt concrete (AC). The study also examined the influences of tack coat curing time, temperature, asphalt mixture type, and surface texture on the performance of tack coats. The study considered four tack coat materials: SS-Ihp, high float emulsion (l1 FE), SS-I vh (very hard, non-track emulsion), and binder grade (PG 64-22). The tack coat was optimized at residual rates of 0.00 to 0.36 Um2 (0.00 to 0.08 gal/yd2). Three curing times were considered: 0.25, 2, and 24 hrs. Two overlay mixes (9.5-mm surface mix and 4.75-mm surface mix) were used. Prior to testing, the specimens were conditioned at four temperatures: -15°C. 5°C, 25°C. and 45°C (5 °F, 41°F, 77°F, and 113 °F). The study found that the optimum tack coat residual rate was 0.18 Um2 (0.04 gal/yd2 ) for trafficked and nontrafficked unmilled aged AC surfaces, while the optimum residual rate for milled AC was 0.26 Um2 (0.06 gaUyd2 ). SS- Ivh tack coat showed superior performance over the other tested tack coats. The optimum curing time was determined to be 2 hrs. Milling the surface improved interface shear strength. The interface shear resistance was greater when the surface nominal maximum aggregate size (NMAS) increased from 4.75 mm to 9.5 mm. Increasing the temperature resulted in a reduction in shear strength. However, the shear strength also reduced when the temperature becomes below the glassy temperature. Result analysis showed that SS-I vh has the greatest stiffness amongst the tested tack coats. This increases with temperature reduction in spite of loss in interface shear strength.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-4597

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Hasiba, Khaled I
Al-Qadi, Imad L
Salinas, Alejandro
Ozer, Hasan
Leng, Zhen
Parish, Derek C

Pagination:

14p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Construction; Highways; Pavements; I50: Construction and Supervision of Construction

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-4597

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:53PM