LTPP Data Analysis: Improving Use of FWD and Longitudinal Profile Measurements
2024

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Pavement structures are designed, constructed, and maintained to support traffic loadings and to minimize the impact of climatic factors on pavement performance. However, variation in environmental factors such as surface temperature and moisture content can result in changes in pavement material properties and impact performance. For asphalt pavement layers, the most significant environmental factor influencing performance is temperature, and for jointed plain concrete pavements, it is temperature and moisture gradients between the top and the bottom of the slab.

NCHRP Web-Only Document 416: LTPP Data Analysis: Improving Use of FWD and Longitudinal Profile Measurements, from TRB's National Cooperative Highway Research Program, presents the development of an approach to adjust falling weight deflectometer measurements to account for changes in temporal and diurnal temperature and moisture conditions for asphalt pavements and to evaluate longitudinal profile measurements to account for curl and warp of jointed plain concrete pavements.

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284 pages · 8.5 x 11 ·
ISBN Ebook: 0-309-73075-9
DOI: https://doi.org/10.17226/28570

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National Academies of Sciences, Engineering, and Medicine. 2024. LTPP Data Analysis: Improving Use of FWD and Longitudinal Profile Measurements. Washington, DC: The National Academies Press.

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Front Matter i-ix
Summary 1-1
1 Introduction 2-5
2 Climatic Effects on Pavement Properties and Performance 6-31
3 LTPP Seasonal Monitoring Program 32-38
4 Evaluation of Climatic Conditions 39-56
5 FWD Deflection Analysis and Adjustment 57-72
6 Longitudinal Profile Analysis and Adjustment 73-82
7 Guidelines for Assessing and Adjusting FWD Measurements 83-85
8 Guidelines for Assessing JPCP Curl and Warp from Longitudinal Profile 86-87
9 Summary and Suggested Research 88-89
References 90-95
Appendix A: Agency Survey and Responses 96-99
Appendix B: SMP Section Summaries 100-191
Appendix C: LTPP SMP Data Tables 192-194
Appendix D: LTPP SMP Climate Data 195-206
Appendix E: Season Definition by SMP Section 207-208
Appendix F: Subgrade Seasonal Adjustment Factor (AASHTO 1993) 209-211
Appendix G: PMED Inputs 212-217
Appendix H: Seasonal Adjustment Factors (PMED) 218-224
Appendix I: EICM and LTPP Layer Modulus 225-256
Appendix J: Influencing Factors for FWD Deflection Measurements 257-264
Guidelines for Adjusting FWD Deflections on Asphalt Pavements to Account for Temperature and Moisture Conditions 265-269
Guidelines for Determining Impacts of Curl and Warp on Jointed Plain Concrete Pavements 270-275

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LTPP Data Analysis: Improving Use of FWD and Longitudinal Profile Measurements (2024)

Chapter: Summary

SUMMARY

Publication information

Suggested citation

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LTPP Data Analysis: Improving Use of FWD and Longitudinal Profile Measurements (2024)

Chapter: Summary

SUMMARY