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Effect of Accelerated Testing on the Rutting and Cracking Performance of Flexible Pavements


Effect of Accelerated Testing on the Rutting and Cracking Performance of Flexible Pavements

BACKGROUND

The evaluation and validation of new/emerging pavement technologies and innovative concepts require assessing their in-service long-term performance.  In-service assessment requires the consideration of the interaction between traffic loading, materials properties, and environmental effects.  The primary disadvantage of such an evaluation approach is the extensive time period required to obtain potentially meaningful results.  Additionally, it is often difficult, impractical, and/or expensive to obtain or account for all the data and information required from in-service experimental set-ups.

 

The need for faster and more practical evaluation methods under closely simulated in-service conditions prompted the consideration of accelerated pavement testing (APT). APT is generally defined as a controlled application of a realistic wheel loading to a pavement system simulating long-term, in-service loading conditions.  This approach allows the monitoring of a pavement system’s performance and response to accumulation of damage within a much shorter time frame.  Such information is critical to support informed highway planning, policy, and decision-making.  Experiences in the United States and abroad have shown that APT can produce cost-effectively early, reliable, and beneficial/practical results while improving pavement technology and understanding/prediction of pavement systems performance.


However, in full-scale APT experiments, the wheel configuration, wheel load magnitude, and speed differ from those imposed by heavy vehicles on in-service pavements. In addition to this, APT testing is done in a short time, under almost constant temperature and moisture conditions. Thus, the aging of the materials and the long-term effect of the environment cannot be reproduced. Therefore, analytical and experimental research is needed to quantify the effects of accelerated testing on the rutting and load-associated cracking performance of flexible pavement structures. Once these effects are quantified, APT will become a more reliable and effective research tool for evaluating new design for pavement materials and structures and new construction procedures.

 


OBJECTIVE

The objective of the research is to quantify the effects of accelerated testing on the rutting and load-associated cracking performance of flexible pavement structures.

 

The following tasks must be performed to accomplish this objective:

TASKS

PHASE I

Task 1. Review domestic and foreign literature and other information relative to the effect of APT testing conditions to the rutting and load-associate cracking performance of flexible pavements. The review shall focus on the effects of loading speed and frequency (head time), temperature, moisture, and age on the rutting and cracking performance of asphalt concrete, bound and unbound aggregate bases, and subgrade soils.

 

Task 2. Prepare a detailed work plan for Phase II that includes an approach for quantifying the effects of accelerated testing on the rutting and load-associated cracking performance of flexible pavement structures. The plan should describe in the greatest detail the proposed analytical and experimental work to be conducted.


Task 3. Prepare an interim report that documents the research performed in Phase I and includes an updated work plan for Phase II.

 

 

PHASE II

Task 4. Execute the plan approved in Task 3. Based on the results of this work, recommend a methodology for quantifying the effects of accelerated testing on the rutting and load-associated cracking performance of flexible pavement structures.


Task 6. Submit a final report that documents the entire research effort. The recommended methodology shall be described in great detail and presented in easy-to-use, step-by-step procedures.



 

Funds Available: $500,000 (Phase I shall be limited to $100,000)

Contract Time: 36 months


Sponsoring Committee:AFD40, Full-Scale and Accelerated Pavement Testing
Funding:0
Source Info:Committee members
Date Posted:02/12/2009
Date Modified:02/12/2009
Index Terms:Flexible pavements, Pavement performance, Accelerated tests, Rutting, Pavement cracking, Load effects,
Cosponsoring Committees: 
Subjects    
Highways
Design
Materials
Pavements
Research

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