Details:

Creators:
Parker, Frazier ; Song, Jiansheng
Parker, Frazier ; Song, Jiansheng Less -
Corporate Creators:
Highway Research Center
Subject/TRT Terms:
[+]
Evaluation Pavement Design Pavement Performance Pavements Pavements, Flexible--United States--Testing Pavements--Performance--United States
Publication/ Report Number:
930-419
Resource Type:
Tech Report
Geographical Coverage:
Alabama
Corporate Publisher:
Alabama. Department of Transportation
Abstract:
Pavements are complicated physical structures responding in a complex way to

the influence of many variables. Understanding how the long-term performance of

pavement: relates to the factors such as environmental and traffic loads is key to

building and maintaining a cost-effectiv~ highway system. For this purpose, SHRPL

TPP, a comprehensive20-year study, was designed to evaluate the performance of

in-service pavemen~.

, ' i J

In this research, pavement performance related data available in DataPave3.0

were extracted and synthesized to cauy out a systematic study of the variables

affecting performance of pavements.,

Firstly, GPS-land GPS-2 test sections from Alabama were analyzed to

evaluate the performance predictive capability of the 1993 AASHTO flexible

pavement design model. Research, showed that, statistically. speaking, the 1993

AASHTO flexible pavement design model provides biased prediction of the

performance of flexible pavements with granular bases and unbiased prediction of

the performance of pavements with bound bases when using subgrade resilient

moduli from laboratory testin~. Research revealed serviceability degradation and

subgrade resilient modulus are the key parameters for t~e 1993 AASHTO design

model.

Secondly, 48 SPS-I sections in Alabama, Arizona, Arkansas, and Iowa were

used to evaluate the effects of specific design feature on pavement performance.

Research revealed that fatigue cracking was a serious distress manifestation for pavements with granular bases. 44Full-depth" AC pavements performed better than

other structural designs. Open graded drainable base layers improved the

performance of pavements over fine-grained subgrades but pavements with dense

graded black bases over coarse-grained subgrades performed better.

Thirdly, 40 SPS-5 sections in Alabama,. Alberta, California, Miss~ssippi and

Texas were chosen to evaluate strategies for rehabilitation of existing pavements.

Research indicated that milling of existing pavement surfaces before overlay

provided some benefits for thin overlay but no benefits for thick overlay. Virgin AC

mixes performed consistently better than AC mixes with 30% RAP. Increased

overlay thickness (thus total thickness) improved performance, especially in

preventing fatigue and transverse cracking.

Data in the SHRP-LTPP database provided a good platform for conducting this

research. But, it has deficiencies such as incompleteness of certain data, and

inconsistencies of some data elements which certainly diminishes confidence in the

evaluations performed.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:c250b70ff91a4968c993997e0c5913c9362e4f5e5f7260ed73550eaefac406b4
Download URL:
https://rosap.ntl.bts.gov/view/dot/5779/dot_5779_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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