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OCR for page 45
45
80
% of Yes Respondents
60
40
20
0
Time of Roadway Roadway Ambient Day vs. Traffic Use Subsequent
Year Type Condition Temp. Night Overlay
Thickness
Responses
Figure 47. Reason for tack coat rate change.
100
80
% of Respondents
60
40
20
0
Remove Reapply Price Ask Require Nothing
Deduction Contractor Improved
not to Repeat Next Pass
Responses
Figure 48. Steps to correct poor application of tack coat.
test, Texas pull-off test, and Florida shear test are some of of the procedures listed for testing the quality of tack coat
the laboratory and field test methods being used to quantify materials are residual percentage test; traction test; penetra-
interface bond strength between pavement layers. tion test on the residual asphalt; AASHTO M 208, Cationic
Emulsified Asphalt (39); and oil distillate test.
Quality of Tack Coat Materials
Current Research Related to Performance
Only 18% of the responses indicated they use a field or
of Tack Materials
laboratory test to evaluate tack coat material quality. Some
Of the respondents, 37% reported that their state or coun-
100 try is conducting or has recently conducted research on tack
coat performance.
% of Respondents
80
60
4.2Experiment I: Development of
40 a Test Device to Evaluate the
Quality of the Bond Strength of
20
Tack Coat Spray Application in
0 the Field
Slippage Delamination Fatigue Top-down Rutting Other
Cracking Cracking The Louisiana Transportation Research Center (LTRC)
Responses and InstroTek, Inc., manufacturer of the ATackerTM, part-
Figure 49. Failures attributed to improper tack nered to develop the Louisiana Tack Coat Quality Tester
application or type. (LTCQT), which was developed in this project to evaluate the
