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Suggested Citation:"Chapter 1. Introduction." 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:"Chapter 1. Introduction." 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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Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

2 CHAPTER 1. INTRODUCTION BACKGROUND Cracking is a primary mode of distress in asphalt pavements and is one of the primary concerns of most DOTs. Meanwhile, asphalt mix designs are becoming increasingly complex because of the increased use of asphalt modifiers, reclaimed asphalt pavement (RAP), recycled asphalt shingles (RAS), recycled tire rubber, recycled plastics, warm mix asphalt technologies, and other additives. DOTs recognize the need for reliable and implementable cracking tests to ensure asphalt mixture performance and ultimately extend the life of asphalt pavements. NCHRP 09-57, Experimental Design for Field Validation of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures, selected multiple candidate cracking tests and developed experimental designs for the ruggedness testing and field validation of these cracking tests. The findings and conclusions of NCHRP 09-57 are summarized in NCHRP Research Results Digest 399: Field Validation of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures: An Experimental Design; the contractor’s final project report is available at https://doi.org/10.17226/23608. NCHRP 09-57A: Ruggedness of Laboratory Tests to Assess Cracking Resistance of Asphalt Mixtures, as a follow-up project to NCHRP 09-57, conducted ruggedness testing on eight cracking tests: 1. ASTM D7313-13: Standard Test Method for Determining Fracture Energy of Asphalt-Aggregate Mixtures Using the Disk-Shaped Compact Tension Geometry (or DCT test). 2. AASHTO TP 105-15: Standard Method of Test for Determining the Fracture Energy of Asphalt Mixtures Using the Semicircular Bend Geometry (SCB or SCB-LT). 3. AASHTO TP 124-18: Standard Method of Test for Determining the Fracture Potential of Asphalt Mixtures Using the Flexibility Index Test (FIT or IFIT). 4. ASTM D8044-16: Standard Test Method for Evaluation of Asphalt Mixture Cracking Resistance Using the SCB Test at Intermediate Temperatures (or SCB-Jc). 5. ASTM D8225-19: Standard Test Method for Determination of Cracking Tolerance Index of Asphalt Mixture Using the Indirect Tensile Cracking Test at Intermediate Temperature (or IDEAL-CT). 6. Tex-248-F: Overlay Test (or OT). 7. AASHTO T 321-17: Standard Method of Test for Determining the Fatigue Life of Compacted Asphalt Mixtures Subjected to Repeated Flexural Bending (or BBF). 8. University of Florida Indirect Tension Test Method (or UF-IDT). The findings, revised test standards, and conclusions of NCHRP 09-57A are summarized in NCHRP Research Report 987: Ruggedness of Laboratory Tests for Asphalt Mixture Cracking Resistance (https://doi.org/10.17226/26528). To accomplish the field validation design originally developed by NCHRP 09-57 in 2015, research was needed to reassess the availability of materials and performance data of both long-term pavement performance (LTPP) and the 2008 Minnesota Road Research Facility (MnROAD) field sections due to the seven-year gap between the original NCHRP 09-57 and now. RESEARCH OBJECTIVE The objective of this research was to reassess the availability of materials and performance data of both LTPP and 2008 MnROAD field sections originally proposed by

3 NCHRP 09-57 in 2015. The scope of work included four major parts: (1) assemble all the published information related to field validation of four cracking tests (IDEAL-CT, DCT, IFIT, and OT); (2) reassess the availability of materials and performance data of both LTPP and 2008 MnROAD field sections; (3) identify alternative field sections as needed; and (4) recommend final candidate field sections for validating laboratory cracking tests. REPORT ORGANIZATION This report documents the overall research results of NCHRP 09-57A—Phase III and contains four chapters in addition to this introduction. The literature review of existing field validation efforts is presented in Chapter 2. Chapter 3 presents the reassessment findings of the availability of materials and performance data of both LTPP and the 2008 MnROAD field sections. Chapter 4 recommends alternative field sections and next steps for validating laboratory cracking tests. Chapter 5 concludes the report with a summary and recommendations for additional research.

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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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