01045568

Component

https://doi.org/10.3141/2040-12

http://scholar.google.com...Timm&publication_year=2007

Rich bottom flexible pavements have become more prevalent as state agencies have begun building perpetual pavements to meet the growing demand for high-performing long-life pavements. The rich bottom uses higher asphalt contents, typically 0.5% above optimum, to achieve greater density and resistance to fatigue. In this way, bottom-up fatigue cracking and consequential full-depth repairs can be eliminated. A rich bottom pavement was included in the 2003 research cycle at the National Center for Asphalt Technology test track to evaluate its effectiveness in controlling fatigue. Although it was expected to perform better than comparable sections, it failed first, in fatigue. An investigation was made to find the cause of the failure and to recommend further action regarding rich bottom pavements. In the course of the study, it was determined that slippage between layers (a construction issue), rather than the increased asphalt content, led to the early failure of the section. Theoretical and measured strain responses, forensic trenching, and laboratory shear strength testing support this conclusion. It was also concluded, as in all pavement construction, that interface bond strength plays a crucial role in pavement performance.

01091297

English

pp 107-114

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309113045

Print

Figures (8) ; Photos (5) ; References (12)

Asphalt content; Bond strength (Materials); Construction management; Debonding; Fatigue (Mechanics); Flexible pavements; Forensic science; Pavement design; Pavement performance; Paving; Perpetual pavements; Service life; Shear strength

Construction; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I52: Construction of Pavements and Surfacings

PRP, TRIS, TRB, ATRI

Feb 8 2007 5:21PM

• Achieving 4% Air Voids in Real Pavements with Superpave
• Assessing Potential for Warm-Mix Asphalt Technology Adoption
• Calibration of Nonnuclear Density Gauge Data for Accurate In-Place Density Prediction
• Comparisons of Contractor and State Transportation Agency Quality Assurance Test Results on Mat Density of Hot-Mix Asphalt Concrete: Findings of a Multistate Analysis
• Early Contractor Involvement and Target Pricing in U.S. and UK Highways
• Effect of Performance Warranties on Cost and Quality of Asphalt Pavements
• Framework Model for Determining Incentive and Disincentive Amounts
• Laboratory Evaluation of Alternative Dowel Bars for Use in Portland Cement Concrete Pavement Construction
• Launching of the San Cristobal Bridge
• Quality Assurance of Mix Properties of Hot-Mix Asphalt Concrete: Multistate Analysis Comparing Contractor and State Transportation Agency Test Results
• Range Imaging as Emerging Optical Three-Dimension Measurement Technology
• Roller-Compacted Concrete Shoulder Construction on Interstate Highway in Georgia
• Value of Pavement Smoothness