Structural evaluation of asphalt pavements with full-depth reclaimed base.

Tang, Shuling; Cao, Yuejian; Labuz, Joseph F.; University of Minnesota. Dept. of Civil Engineering

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Structural evaluation of asphalt pavements with full-depth reclaimed base.

2012-12-01
By Tang, Shuling ; Cao, Yuejian ; Labuz, Joseph F.

[PDF-1.35 MB]

English

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Details:

Creators:

Tang, Shuling ; Cao, Yuejian ; Labuz, Joseph F.

Tang, Shuling ; Cao, Yuejian ; Labuz, Joseph F. Less -
Corporate Creators:

University of Minnesota. Dept. of Civil Engineering
Subject/TRT Terms:

[+]

Asphalt Pavements Base Course (Pavements) Falling Weight Deflectometers Freeze Thaw Durability Full-depth Reclamation Granular Bases Pavement Design Stiffness Tests Structural Analysis
Publication/ Report Number:

MN/RC 2012-36
Resource Type:

Tech Report
Geographical Coverage:

Minnesota
Corporate Publisher:

Minnesota. Dept. of Transportation. Research Services Section
NTL Classification:

NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
Abstract:

Currently, MnDOT pavement design recommends granular equivalency, GE = 1.0 for non-stabilized full-depth

reclamation (FDR) material, which is equivalent to class 5 material. For stabilized full-depth reclamation (SFDR),

there was no guideline for GE at the time this project was initiated (2009). Some local engineers believe that GE of

FDR material should be greater than 1.0 (Class 5), especially for SFDR. In addition, very little information is

available on seasonal effects on FDR base, especially on SFDR base. Because it is known from laboratory studies

that SFDR contains less moisture and has higher stiffness (modulus) than aggregate base, it is assumed that SFDR

should be less susceptible to springtime thawing.

Falling Weight Deflectometer (FWD) tests were performed on seven selected test sections on county roads in

Minnesota over a period of three years. During spring thaw of each year, FWD testing was conducted daily during

the first week of thawing in an attempt to capture spring thaw weakening of the aggregate base. After the spring

thaw period, FWD testing was conducted monthly to study base recovery and stiffness changes through the

seasons.

GE of SFDR was estimated using a method established by MnDOT using FWD deflections, and the GE of SFDR is

about 1.5. The value varies from project to project as construction and material varies from project to project. All

the materials tested showed seasonal effects on stiffness. In general, the stiffness is weaker in spring than that in

summer and fall.
Format:

PDF
Funding:

(C) 89261 (WO) 156
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:02541be76e1339899fb277b9285da1e386a22b5aede40a27580995bd4e1e6e2f
Download URL:

https://rosap.ntl.bts.gov/view/dot/26072/dot_26072_DS1.pdf
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Structural evaluation of asphalt pavements with full-depth reclaimed base.

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