Using the Results of Contractor-Performed Tests in Quality Assurance: Contractor's Final Report (2007)

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Table of Contents CHAPTER 1: INTRODUCTION _______________________________________________ 1 PROBLEM STATEMENT AND RESEARCH OBJECTIVES ____________________________1 RESEARCH APPROACH _________________________________________________________4 CHAPTER 2: STATE OF PRACTICE__________________________________________ 6 HISTORICAL PERSPECTIVE______________________________________________________6 REVIEWS AND SURVEYS ________________________________________________________9 Procedures for Using Contractor-Performed Tests ______________________________________12 Procedures for Hot Mix Asphalt Concrete ______________________________________________15 Procedures for Portland Cement Concrete______________________________________________22 Confidence in Contractor-Performed Tests _____________________________________________26 COMPARISONS OF CONTRACTOR AND STATE DOT-PERFORMED TESTS__________26 Alabama DOT Hot Mix Asphalt Concrete Tests __________________________________________27 Alabama DOT Portland Cement Concrete Tests _________________________________________45 Kentucky Transportation Cabinet Hot Mix Asphalt Concrete and Portland Cement Concrete Tests ________________________________________________________________________________50 SUMMARY _____________________________________________________________________52 CHAPTER 3: COMPARISONS OF CONTRACTOR-PERFORMED AND STATE DOT- PERFORMED TESTS ______________________________________________________ 54 INTRODUCTION ________________________________________________________________54 STATISTICAL ANALYSIS TECHNIQUES __________________________________________58 SAMPLING AND TESTING CAPABILITIES_________________________________________59 ANALYSIS OF GEORGIA DOT HOT MIX ASPHALT CONCRETE DATA _______________60 ANALYSIS OF FLORIDA DOT HOT MIX ASPHALT CONCRETE DATA________________77 ANALYSIS OF NORTH CAROLINA DOT HOT MIX ASPHALT CONCRETE DATA ______96 Mix Properties Comparisons __________________________________________________________96 Mat Density Comparisons ___________________________________________________________ 114 ANALYSIS OF KANSAS DOT HOT MIX ASPHALT CONCRETE DATA _______________131 ANALYSIS OF CALTRANS HOT MIX ASPHALT CONCRETE DATA _________________141 ANALYSIS OF NEW MEXICO DOT HOT MIX ASPHALT CONCRETE DATA __________151 ANALYSIS OF COLORADO DOT PORTLAND CEMENT CONCRETE PAVEMENT DATA ______________________________________________________________________ 160 ANALYSIS OF FHWA–WESTERN FEDERAL LANDS HIGHWAY DIVISION AGGREGATE COURSE DATA________________________________________________________________163

ii CHAPTER 4: EVALUATION OF THE EFFECTS OF DIFFERENCES IN TEST RESULTS ON ACCEPTANCE OUTCOMES__________________________________ 173 CHAPTER 5: CONCLUSIONS AND RECOMMENDATIONS____________________ 178 REFERENCES ___________________________________________________________ 180 APPENDICES ___________________________________________________________ 183