000			01772nam a22002055i 4500
999			_c56858 _d56858
001			20991643
008			190530s2019 dcu 000 0 eng
020			_a9780309480420
082			_a388.42 _bMcD
100			_aMcDaniel, Rebecca S. _971118
245	1	0	_aImpact of asphalt thickness on pavement quality : a synthesis of highway practice
260			_aWashington, D.C. _bTransportation Research Board _c2019
300			_aviii,120p.
440			_aNational cooperative highway research program NCHRP Synthesis _vNo.537 _971717
505			_aContents Summary 1 Chapter 1 : Introduction 3 1.1 Background 4 1.2 Synthesis Approach 5 Chapter 2 : Literature Review: Effects of Lift Thickness on Pavement Performance 6 2.1 Basics of Compaction 6 2.2 Evolution of Superpave 8 2.3 Relationships Between Lift Thickness, NMAS, and Air Voids 11 2.4 Performance Impacts 13 2.5 Costs and Benefits 19 2.6 Summary of Findings from Literature 21 Chapter 3 : Survey Results: Current Practices Regarding Lift Thicknesses 23 3.1 State DOT Survey Responses 23 3.2 Canadian Responses 34 3.3 Industry Survey Responses 35 3.4 Analysis and Summary of Survey Findings 43 Chapter 4 : Case Examples 44 4.1 Florida-The Miner's Canary? 44 4.2 Through Thick and Thin 46 4.3 Increasing Field Density-A National Study 48 4.4 A Contractor Seeks Solutions 49 Chapter 5 : Conclusions and Further Research 51 5.1 Conclusions 51 5.2 Gaps in the Knowledge and Future Research Needs 54 References 55 Abbreviations 58 Appendix A State Survey Questionnaire 60 Appendix B Industry Survey Questionnaire 67 Appendix C Tabulated State Survey Responses 72 Appendix D Tabulated Industry Survey Responses 103
600			_965519
890			_aUSA
891			_aGratis _aCEPT-COE-UTPM
942			_2ddc