STATE ROUTE-22 SMART PAVEMENT
PROJECT DESCRIPTION
PHASE II b
The tasks in Phase IIa and IIb are critical in establishing the long-term degradation of the
pavement with accumulated loadings and for successfully completing objectives 1-7
defined above under Phase I. Upon completion of the tasks in Phase II, material
properties and other design inputs for the 2002 Design Procedure will be established, the
ability of HIPERPAVE to predict strength gain and early age stress development will be
evaluated, thermal and moisture gradients typical for Pennsylvania climates, construction
materials and pavement design represented on S.R.-22 will documented, construction
curling and seasonal and diurnal curling will be quantify for S.R.-22, correlations
between strength and the elastic modulus will be evaluated, the slab response to
environmental and applied loads will be characterized and the slab performance (or
degradation) over time will be compared with the anticipated degradation curve so that
any deviations between predicted and actual performance can be identified.
The following tasks will be performed under Phase IIb.
PROFILE MEASUREMENTS
Profile measurements will be made to quantify seasonal and diurnal curling. This
information will be used to help predict pavement performance and to establish
curling/warping parameters required for the 2002 Design Guide.
LOAD TESTING
Load testing will consist of running trucks with various axle configurations and known
weights over the pavement. Trucks (lowboy & triaxle truck) and drivers will be provided
by District 12. Falling weight deflectometer testing will be performed by PENNDOT
Central Office personnel on the instrumented test sections. The University of Pittsburgh
will collect dynamic strain data in conjunction with the falling weight deflectometer
testing and tuck loadings just described.
DATA ANALYSIS
All sensor data being collected will be processed and validated. The performance of this
step prior to performing the data analysis is critical to the development of a functional
database. Maintenance of the automated data collection system and the database will
continue. The manually collected data, including the profile measurements and the load
test data, will also be processed and analyzed. The extensive data collection effort that
will be performed, along with the extensive material characterization provide by the
laboratory testing, will be used in a detailed evaluation of the response of the slab and the
ability of current models to predict the slab response. This data will also be used to
establish the baseline required for evaluating the long-term performance (degradation
curve) of the pavement.
The following tasks will be performed by the University of Pittsburgh under Phase IIb.
PHASE IIb TASKS (May 1, 2005 through Oct. 1, 2007)
1.) Perform seasonal load tests, as previously described, at the following times
- Summer, Fall and Winter 2005
- Spring, Summer, Fall and Winter 2006
- Spring, Summer 2007
2.) Perform seasonal profile measurements
Restrained Slab (3 slabs) and Unrestrained Slab (3 slabs)
Diagonal Profile Measurements (+/- 0.001 in) Dipstick
- Summer, Fall, and Winter 2005: Capture maximum, minimum and near-zero
gradients
- Spring, Summer, Fall and Winter 2006: Capture maximum, minimum and near-
zero gradients
-Spring and Summer 2007: Capture maximum, minimum and near-zero gradients
3.) Perform 365-day material property testing in August 2005 (See table 1.)
4.) Analyze all data collected manually and with the automated system
5.) Write report
A report will be submitted each year documenting the findings throughout that
year. A final report will be submitted upon completion of the project
summarizing the findings of this research effort. A copy of the Access database
will also be provided.
DURATION
May 1, 2004 through Dec. 1, 2007
PENNDOT Central Office
High Speed Profiler
Falling Weight Deflectometer Testing -
PCC Pavement (Test Locations: edge, corner, midpanel and wheelpath (approach
and leave)) - 4 times per year (once during each season)
PENNDOT D-12
Load Testing
- Trucks with various axle configurations and know weights will be used to load
the pavement (Trucks and drivers will be provided by District 12.)
- Falling weight deflectometer data will be performed by PENNDOT Central
Office personnel
- University of Pittsburgh will collect dynamic strain data in conjunction with the
falling weight deflectometer testing and tuck loadings just described
Dipstick and/or CYREX Scanner
Extract Cores –365 days
Table 1. Hardened concrete test to be performed.
Hardened Concrete Material Properties
Test Date No. of
(days) Specimens
Cylinders
Compression 365 3
Elastic Modulus 365 3
Poisson’s Ratio 365 3
Split Tensile 365 3
Thermal Coefficient 365 3
Total Cylinders Cast 6a
Beams
Flexural Strength 365 3
Fracture Energy 365 3
Drying Shrinkage 365 3
Total Beams Cast 6b
Cores
Compression 365 3
Elastic Modulus 365 3
Poisson’s Ratio 365 3
Split Tensile 365 3
Thermal Coefficient 365 3
Thickness 365 9
Total Cores Extracted 9c
a
The same specimens will be used for measuring the elastic modulus and Poisson’s ratio.
Thermal coefficient measurements will be made on the same three specimens that were tested
at 1, 3, 7 and 28 days.
b
Drying shrinkage measurements will be made on the same three specimens that were tested
at 1, 3, 7 and 28 days.
c
The same specimens will be used for measuring the compressive strength, elastic modulus
and Poisson’s ratio and the thickness will be measured on all specimens prior to testing.