NCHRP Report 712: Optimization of Tack Coat for HMA Placement
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NCHRP Report 712:
Optimization of Tack Coat for HMA Placement
(2012)
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Description

TRB's National Cooperative Highway Research Program (NCHRP) Report 712: Optimization of Tack Coat for HMA Placement presents proposed test methods for measuring the quality and performance characteristics of tack coat in the laboratory and the field, and includes a training manual presenting proposed construction and testing procedures for tack coat materials.

Links to appendixes B and D to NCHRP Report 712, which are available only in electronic format, are below:

• Appendix B: ATackerâ"¢ Displacement Rate Verification Experiment

• Appendix D: Comparison of the LISST Device and the Simple Shear Tester (SST)

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Publication Info

146 pages | 8.5 x 11
Contents

Table of Contents

skim chapter
Front Matter i-xi
Summary 1-3
1.3 Research Scope 4-4
1.4 Research Approach 5-6
2.1 Tack Coat Materials 7-7
2.3 Tack Coat Breaking and Setting Time 8-8
2.4.1 Equipment 9-9
2.4.2 Proper Tack Coat Application 10-10
2.5.1 Laboratory Characterization of Tack Coats 11-13
2.6 Worldwide Survey 14-18
3.2.1 HMA Pavement Surface Preparation 19-19
3.2.3 Tack Coat Application 20-21
3.2.4 Overlay Construction 22-23
3.2.6 Specimen Coring and Conditioning 24-26
3.3 Experiment Plan I: Development of a Test Device to Evaluate the Quality of the Bond Strength of Tack Coat Spray Application in the Field 27-27
3.6 Experiment Plan IV: Effects of Test Temperature and Its Relationship with Tack Coat Rheology 28-29
3.8 Experiment Plan VI: Effects of Surface Texture and Permeability on Interface Shear Strength 30-31
3.9 Theoretical Investigation 32-34
4.1.2 Types of Tack Coat Applied to Different Pavement Surfaces 35-36
4.1.3 Findings Related to Tack Coat Application Methods 37-43
4.1.4 Findings Related to Tack Coat Application 44-44
4.2 Experiment I: Development of a Test Device to Evaluate the Quality of the Bond Strength of Tack Coat Spray Application in the Field 45-45
4.2.2 Second Generation of LTCQT 46-47
4.2.3 Development of Tack Coat Test Procedure Using LTCQT 48-48
4.2.5 Effect of Tack Coat Temperature on the Ultimate Tensile Strength 49-50
4.3 Experiment II: Rheological Properties of Tack Coat Materials and Its Relationship to Bond Strength 51-51
4.3.2 Relationship Between LTCQT Test Results and Tack Coat Rheological Properties 52-52
4.4 Experiment III: Development of a Laboratory Test Procedure to Measure the Interface Bond Strength 53-54
4.4.1 Effects of Tack Coat Characteristics on Interface Shear Strength 55-57
4.4.2 Effect of Confining Pressure 58-59
4.4.3 Effect of Dusty Conditions of HMA Surface 60-60
4.5.1 Interface Bond Strength at Various Temperatures 61-64
4.5.3 Relationship Between Interface Shear Strength and Tack Coat Rheology 65-65
4.6.1 Effects of Tack Coat Type and Residual Application Rate 66-67
4.6.3 Effects of Surface Wetness 68-68
4.7 Experimental VI: Effects of Texture and Permeability on Tack Coat Bond Strength 69-71
4.8 Theoretical Investigation 72-79
Section 5 - Conclusions 80-81
References 82-83
Appendix A - Worldwide Survey Questionnaire 84-88
Appendix B - ATacker Displacement Rate Verification Experiment 89-89
Appendix C - Standard Test Method for Assessing Tack Coat Installation Quality Using the LTCQT 90-96
Appendix D - Comparison of the LISST Device and the Simple Shear Tester 97-97
Appendix E - Standard Test Procedure for Measuring Interface Bond Strength in the Laboratory Using the LISST 98-105
Appendix F - Tack Coat Training Manual 106-134
Abbreviations used without definitions in TRB publications 135-135

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