01622426

Component

https://doi.org/10.3141/2630-16

Crack sealants often are used as a preservation tool in asphalt pavements. These sealants are placed in cracks to prevent water intrusion into the pavement foundation. Through the reduction of water intrusion, the strength of foundation layers is maintained, and acceptable pavement performance is extended. However, when a hot-mix asphalt overlay is placed on top of a pavement that contains crack sealants, a bump and additional transverse cracks sometimes occur in the new overlay asphalt. These bumps and sometimes transverse cracks are initiated during breakdown rolling and become progressively more severe on further compaction. This paper presents the results of a 5-year study designed to identify factors that related to the appearance of these bumps and consequent cracks. The results of the study indicated that vibratory breakdown rolling, pavement gradient, sealant geometry, tack coat application rate, and tack coat adhesivity were factors that contributed most to the occurrence of bumps and transverse cracks during asphalt overlay construction over crack sealants. Observations suggested that transverse bumps and consequent cracks occurred in proportion to the size of the bow wave of asphalt concrete present immediately in front of the breakdown roller. The increase in the bow-wave size depended on asphalt mixture properties, breakdown roller size, speed, vibration characteristics, and pavement gradient. Three pavement test sections also indicated that the tack coat application rate had an effect on reduction in the appearance of transverse bumps.

01634656

17-01354

English

pp 128–133

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441841

Digital/other

Figures (1) ; References (4) ; Tables (6)

Bituminous overlays; Compaction; Pavement cracking; Sealing compounds; Tack coats; Test sections

Bumps

Highways; Materials; Pavements

PRP, TRIS, TRB, ATRI

Dec 8 2016 10:26AM

• Assessment of State Agencies’ Practices in Managing Geotechnical Risk in Design–Build Projects
• Comparison of Qualifications-Based Selection and Best-Value Procurement for Construction Manager–General Contractor Highway Construction
• Density Observations from a Full-Scale, Untrafficked Test Section with Guidance for Dryback Methods
• Economic Impact Analysis of Bridge Construction
• Estimating Earthwork Volumes Through Use of Unmanned Aerial Systems
• Evaluation of Stainless Steel Fasteners for Bolted Field Splice Connections of ASTM A1010 Corrosion-Resistant Steel Plate Girders
• Exploration of Early Work Packaging in Construction Manager–General Contractor Highway Projects
• Field and Laboratory Properties of Roller-Compacted Concrete Pavements
• Framework for Objectively Determining Best Practices for Alternative Contracting Methods
• Highly Modified Asphalt Binder for Asphalt Crack Relief Mix
• Impact of Alternative Project Delivery Systems on the International Roughness Index: Case Studies of Transportation Projects in the Western United States
• Impact of High Asphalt Binder Replacement on Level Binder Properties for Controlling Reflective Cracking
• Monitoring During Lateral Bridge Slide
• New Quality Assurance Tests for Building Quality Concrete Pavement
• Project Scoping Process Model Development to Achieve On-Time and On-Budget Delivery of Highway Projects
• Roles and Responsibilities of Independent Cost Estimator in Construction Manager–General Contractor Highway Construction
• Wisconsin Department of Transportation Hot-Mix Asphalt Round Robin Laboratory Qualification Testing Program