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From… Maintenance Technical Advisory Guide (MTAG) Chapter 1 Introduction.

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1 From… Maintenance Technical Advisory Guide (MTAG) Chapter 1 Introduction

2 Presentation Outline Purpose of pavement preservation (PP) Definition of PP Components of PP Program PP Concept Essentials of PP Program Benefits of PP Fundamentals of Pavements Flexible Pavement Distresses Organization of the MTAG

3 Purpose of Pavement Preservation To keep good pavements in good or near new conditions by applying the right maintenance strategies that are cost- effective at the right time to extend pavement life and preserve investments.

4 Definition of Pavement Preservation A program employing a network level, long-term strategy that enhances pavement performance by using an integrated, cost-effective set of practices that extend pavement life, improve safety and meet motorist expectations (FHWA, 2005).

5 Components of Pavement Preservation Program Consists primarily of three components: preventive maintenance minor rehabilitation (restoration), and some routine maintenance Does not include new pavements or pavements that require major rehabilitation or reconstruction.

6 Pavement Preservation Concept A proactive approach in maintaining the existing highways Addresses pavements while they are still in good condition and before the onset of serious damage Applying a cost-effective treatment at the right time to the right pavement to extend pavement life

7 Essentials of Pavement Preservation Program Pavement preservation is an agency program An effective pavement preservation program include agency leadership and a dedicated annual budget, and support and input from staff in planning, finance, design, construction, materials, and maintenance

8 Benefits of Pavement Preservation Benefits of pavement preservation program: preserving the roadway network enhancing pavement performance ensuring cost-effectiveness by extending pavement life, and reducing user delays by avoiding rehabilitation or reconstruction. Some of these benefits may be noticed immediately and some may be realized over time

9 Typical Pavement Performance Curve Structural / Functional Condition Pavement Life Minimum Acceptable Rating Roadway Rehabilitation Reconstruction Restoration (CAPM) Preservation

10 Importance of Timely Treatments

11 Cost Effects of Treatments

12 Fundamentals of Pavements Function of pavements Factors affecting pavement performance Subgrade soil Pavement materials characteristics Asphalt cement Aggregate Modifiers for asphalt cement (e.g., rubber and polymers) Additives or stabilizing agents for aggregates (e.g., lime and cement) Traffic loading Environment Moisture; and Temperature

13 Flexible Pavement Distresses Distress Type and Mechanism for HMA Cracking Deformation Deterioration Mat problems Distress Type and Mechanism for Surface Treatments Surface problems Reflection cracking

14 HMA Pavement Distresses CategoryDistress Type CrackingLongitudinal, fatigue, transverse, reflective, block, edge DeformationRutting, corrugation, shoving, depression, overlay bumps DeteriorationDelamination, potholes, patching, raveling, stripping, polished aggregate, pumping Mat problemSegregation, checking, bleeding

15 Surface Treatments Distresses CategoryDistress Type Seal CoatsRock loss, segregation, streaking, bleeding/fat spots, reflection cracking Slurry/ Microsurfacing Delamination, raveling, drag marks, joints, reflection cracking

16 Organization of MTAG MTAG provides guidance on selecting the most appropriate strategies to address various pavement distresses described earlier by applying pavement preservation treatments Organization of Guide Chapter 2 is on materials Chapter 3 presents a framework for treatment selection Chapters 4 through 13 describe various strategies in detail

17 Chapters Covered in MTAG 2nd Ed ChapterTopic 4Crack Sealing, Crack Filling, and Joint Sealing 5Patching and Edge Repair 6Chip Seals 7Fog and Rejuvenating Seals 8Slurry Seals 9Microsurfacing 10Thin Maintenance Overlays 11Bonded Wearing Courses 12In-Place Recycling (training module under development 13Interlayers (Chapter and training module under development)

18 Summary Applying the Right treatment to the Right pavement at the Right time is the Core of Pavement Preservation

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