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Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures (2023)

Chapter: Appendix D: Pavement Structure of the 40 LTPP Field Sections

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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
×
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
×
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
×
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Suggested Citation:"Appendix D: Pavement Structure of the 40 LTPP Field Sections." National Academies of Sciences, Engineering, and Medicine. 2023. Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures. Washington, DC: The National Academies Press. doi: 10.17226/27421.
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D-1 APPENDIX D: PAVEMENT STRUCTURE OF THE 40 LTPP FIELD SECTIONS Table D-1. Pavement Structure of LTPP Section 01-0101. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Silt 2 Unbound (granular) base 7.9 Crushed Stone 3 Asphalt concrete layer 6.2 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.2 Hot Mixed, Hot Laid AC, Dense-Graded Table D-2. Pavement Structure of LTPP Section 01-0102. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Lean Clay 2 Unbound (granular) base 12 Crushed Stone 3 Asphalt concrete layer 2.8 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-3. Pavement Structure of LTPP Section 01-0103. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Lean Clay 2 Bound (treated) base 7.4 HMAC 3 Asphalt concrete layer 2.8 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-4. Pavement Structure of LTPP Section 01-0104. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silt with Sand 2 Bound (treated) base 12.2 HMAC 3 Asphalt concrete layer 4.9 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-5. Pavement Structure of LTPP Section 01-0105. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silt with Sand 2 Unbound (granular) base 4 Crushed Stone 3 Bound (treated) base 4.1 HMAC 4 Asphalt concrete layer 2.8 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 1.3 Hot Mixed, Hot Laid AC, Dense-Graded

D-2 Table D-6. Pavement Structure of LTPP Section 01-0106. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silt with Sand 2 Unbound (granular) base 8 Crushed Stone 3 Bound (treated) base 8.4 HMAC 4 Asphalt concrete layer 5.5 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-7. Pavement Structure of LTPP Section 04-A901. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand with Gravel 2 Unbound (granular) base 4 Crushed Gravel 3 Asphalt concrete layer 6.9 Hot Mixed, Hot Laid AC, Dense-Graded Table D-8. Pavement Structure of LTPP Section 04-A903. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Well-Graded Gravel with Silt and Sand 2 Unbound (granular) base 4 Crushed Gravel 3 Asphalt concrete layer 6.7 Hot Mixed, Hot Laid AC, Dense-Graded Table D-9. Pavement Structure of LTPP Section 04-B901. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand with Gravel 2 Unbound (granular) base 10.8 Crushed Gravel 3 Asphalt concrete layer 2.8 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0 Hot Mixed, Hot Laid AC, Open-Graded 5 Asphalt concrete layer 4.4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 3.5 Hot Mixed, Hot Laid AC, Dense-Graded Table D-10. Pavement Structure of LTPP Section 04-B903. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand with Gravel 2 Unbound (granular) base 10.8 Crushed Gravel 3 Asphalt concrete layer 3 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0 Hot Mixed, Hot Laid AC, Open-Graded 5 Asphalt concrete layer 4.4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 4 Hot Mixed, Hot Laid AC, Dense-Graded

D-3 Table D-11. Pavement Structure of LTPP Section 05-0803. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Lean Clay with Sand 2 Unbound (granular) base 7.3 Crushed Gravel 3 Asphalt concrete layer 2.5 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.2 Hot Mixed, Hot Laid AC, Dense-Graded Table D-12. Pavement Structure of LTPP Section 05-0804. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Lean Clay with Sand 2 Unbound (granular) base 12.7 Crushed Gravel 3 Asphalt concrete layer 5.7 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.6 Hot Mixed, Hot Laid AC, Dense-Graded Table D-13. Pavement Structure of LTPP Section 18-A901. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soils: Poorly Graded Sand with Clay 2 Unbound (granular) subbase 8 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Portland cement concrete layer 10 Portland Cement Concrete (JRCP) 4 Asphalt concrete layer 4.5 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 1.8 Hot Mixed, Hot Laid AC, Dense-Graded Table D-14. Pavement Structure of LTPP Section 28-0805. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand with Gravel 2 Unbound (granular) base 9 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 2 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2 Hot Mixed, Hot Laid AC, Dense-Graded

D-4 Table D-15. Pavement Structure of LTPP Section 28-0902. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand with Gravel 2 Bound (treated) subbase 6 Fine-Grained Soils: Silty Clay with Sand 3 Unbound (granular) subbase 13.5 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 4 Unbound (granular) base 7 Crushed Stone 5 Asphalt concrete layer 5.5 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 4.2 Hot Mixed, Hot Laid AC, Dense-Graded 7 Asphalt concrete layer 2.3 Hot Mixed, Hot Laid AC, Dense-Graded 8 Asphalt concrete layer 2 Hot Mixed, Hot Laid AC, Dense-Graded Table D-16. Pavement Structure of LTPP Section 30-0901. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soils: Well-Graded Sand with Gravel 2 Unbound (granular) base 1 Crushed Gravel 3 Asphalt concrete layer 4.9 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.2 Chip Seal Table D-17. Pavement Structure of LTPP Section 30-0902. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soils: Well-Graded Sand with Gravel 2 Unbound (granular) base 1 Crushed Gravel 3 Asphalt concrete layer 4.7 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.2 Chip Seal Table D-18. Pavement Structure of LTPP Section 30-0903. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soils: Well-Graded Sand with Gravel 2 Unbound (granular) base 1 Crushed Gravel 3 Asphalt concrete layer 4.8 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.2 Chip Seal

D-5 Table D-19. Pavement Structure of LTPP Section 35-0501. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand 2 Unbound (granular) base 12 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 3.7 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2.2 Recycled AC, Cold Laid Mixed-In-Place 5 Asphalt concrete layer 0.3 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 0 Chip Seal 7 Asphalt concrete layer 2 Hot Mixed, Hot Laid AC, Dense-Graded 8 Asphalt concrete layer 1 Hot Mixed, Hot Laid AC, Dense-Graded 9 Asphalt concrete layer 1.3 Hot Mixed, Hot Laid AC, Open-Graded Table D-20. Pavement Structure of LTPP Section 35-0502. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand with Gravel 2 Unbound (granular) base 12.5 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 3.3 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 3.2 Recycled AC, Cold Laid Mixed-In-Place 5 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 0.5 Chip Seal 7 Asphalt concrete layer 2.1 Hot Mixed, Hot Laid AC, Dense-Graded 8 Asphalt concrete layer 0.8 Hot Mixed, Hot Laid AC, Open-Graded Table D-21. Pavement Structure of LTPP Section 35-0503. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand 2 Unbound (granular) base 15 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 3.6 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 3.2 Recycled AC, Cold Laid Mixed-In-Place 5 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 0.3 Chip Seal 7 Asphalt concrete layer 4.4 Recycled AC, Hot Laid, Central Plant Mix 8 Asphalt concrete layer 1 Hot Mixed, Hot Laid AC, Open-Graded

D-6 Table D-22. Pavement Structure of LTPP Section 35-0504. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand 2 Unbound (granular) base 12.7 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 3.5 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2.7 Recycled AC, Cold Laid Mixed-In-Place 5 Asphalt concrete layer 1.7 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 0.4 Chip Seal 7 Asphalt concrete layer 4.6 Hot Mixed, Hot Laid AC, Dense-Graded 8 Asphalt concrete layer 0.6 Hot Mixed, Hot Laid AC, Open-Graded Table D-23. Pavement Structure of LTPP Section 35-0505. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand 2 Unbound (granular) base 8 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 3.2 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2.4 Recycled AC, Cold Laid Mixed-In-Place 5 Asphalt concrete layer 1.6 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 0.5 Chip Seal 7 Asphalt concrete layer 2.5 Hot Mixed, Hot Laid AC, Dense-Graded 8 Asphalt concrete layer 0.8 Hot Mixed, Hot Laid AC, Open-Graded Table D-24. Pavement Structure of LTPP Section 35-0801. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand 2 Unbound (granular) base 9.7 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 4.2 Hot Mixed, Hot Laid AC, Dense-Graded Table D-25. Pavement Structure of LTPP Section 35-0802. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Clayey Sand with Gravel 2 Unbound (granular) base 12.7 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 7 Hot Mixed, Hot Laid AC, Dense-Graded

D-7 Table D-26. Pavement Structure of LTPP Section 35-0901. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Silt 2 Unbound (granular) base 9 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 2.6 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.2 Recycled AC, Cold Laid Mixed-In-Place 6 Asphalt concrete layer 4.4 Hot Mixed, Hot Laid AC, Dense-Graded 7 Asphalt concrete layer 1 Hot Mixed, Hot Laid AC, Open-Graded Table D-27. Pavement Structure of LTPP Section 35-0902. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Silt 2 Unbound (granular) base 12 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 2.1 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.2 Recycled AC, Cold Laid Mixed-In-Place 6 Asphalt concrete layer 4.5 Hot Mixed, Hot Laid AC, Dense-Graded 7 Asphalt concrete layer 1 Hot Mixed, Hot Laid AC, Open-Graded Table D-28. Pavement Structure of LTPP Section 35-0903. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Sandy Silt 2 Unbound (granular) base 10.5 Soil-Aggregate Mixture (Predominantly Coarse-Grained) 3 Asphalt concrete layer 1.9 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.2 Recycled AC, Cold Laid Mixed-In-Place 6 Asphalt concrete layer 4.8 Hot Mixed, Hot Laid AC, Dense-Graded 7 Asphalt concrete layer 1 Hot Mixed, Hot Laid AC, Open-Graded

D-8 Table D-29. Pavement Structure of LTPP Section 35-AA01. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silty Clay 2 Unbound (granular) base 12 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 5 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.8 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.9 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 3.2 Recycled AC, Hot Laid, Central Plant Mix Table D-30. Pavement Structure of LTPP Section 35-AA02. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silty Clay 2 Unbound (granular) base 12 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 3.3 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.1 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 3.6 WMA Concrete, Dense-Graded Table D-31. Pavement Structure of LTPP Section 35-AA03. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silty Clay 2 Unbound (granular) base 12 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 4.3 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.6 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 4.3 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 3.3 WMA Concrete, Dense-Graded Table D-32. Pavement Structure of LTPP Section 35-AA61. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silty Clay 2 Unbound (granular) base 13 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 3.6 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.7 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.8 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 3.4 WMA Concrete, Dense-Graded

D-9 Table D-33. Pavement Structure of LTPP Section 35-AA62. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Fine-Grained Soils: Silty Clay 2 Unbound (granular) base 13 Soil-Aggregate Mixture (Predominantly Fine-Grained) 3 Asphalt concrete layer 3.8 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 0.8 Hot Mixed, Hot Laid AC, Dense-Graded 5 Asphalt concrete layer 3.4 Hot Mixed, Hot Laid AC, Dense-Graded 6 Asphalt concrete layer 4 WMA Concrete, Dense-Graded Table D-34. Pavement Structure of LTPP Section 37-0801. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soils: Sand 2 Unbound (granular) base 8.7 Crushed Gravel 3 Asphalt concrete layer 2.2 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.6 Hot Mixed, Hot Laid AC, Dense-Graded Table D-35. Pavement Structure of LTPP Section 37-0802. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand 2 Unbound (granular) base 11.5 Crushed Gravel 3 Asphalt concrete layer 2.7 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-36. Pavement Structure of LTPP Section 37-0859. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand 2 Unbound (granular) base 6.4 Crushed Gravel 3 Asphalt concrete layer 1.4 Hot Mixed, Hot Laid AC, Dense-Graded Table D-37. Pavement Structure of LTPP Section 49-0803. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand 2 Unbound (granular) base 7.8 Crushed Gravel 3 Asphalt concrete layer 4.9 Hot Mixed, Hot Laid AC, Dense-Graded

D-10 Table D-38. Pavement Structure of LTPP Section 49-0804. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand 2 Unbound (granular) base 12 Crushed Gravel 3 Asphalt concrete layer 7.1 Hot Mixed, Hot Laid AC, Dense-Graded Table D-39. Pavement Structure of LTPP Section 55-0805. Layer Number Layer Type Thickness (in) Material Description 1 Subgrade (untreated) Coarse-Grained Soil: Silty Sand with Gravel 2 Unbound (granular) base 8.7 Gravel (Uncrushed) 3 Asphalt concrete layer 2.3 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 1.9 Hot Mixed, Hot Laid AC, Dense-Graded Table D-40. Pavement Structure of LTPP Section 55-0806. Layer Number Layer Type Thickness (in) Material Description ` Subgrade (untreated) Coarse-Grained Soil: Silty Sand with Gravel 2 Unbound (granular) base 12 Gravel (Uncrushed) 3 Asphalt concrete layer 5 Hot Mixed, Hot Laid AC, Dense-Graded 4 Asphalt concrete layer 2 Hot Mixed, Hot Laid AC, Dense-Graded

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 Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures
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Cracking and durability issues of asphalt pavements have been primary concerns of departments of transportation the last two decades. Several modes of asphalt pavement cracking exist—fatigue, top-down, reflective, and thermal—and all are influenced by thermal loading, traffic loading, or a combination of both.

NCHRP Web-Only Document 389: Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures, from TRB's National Cooperative Highway Research Program, documents existing field validation efforts for these four modes of cracking.

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