Find C-LTPP Sections (a.k.a Section Filters) enables the user to define (and refine) search criteria to narrow down the C-LTPP section selection. Users can apply filters from multiple classifications at the their discretion. Selected Section Count is updated in real-time as the user applies filters.
The over all goal of the C-LTPP project is to "increase pavement life through the development of cost-effective pavement rehabilitation procedures, based upon systematic observation of in-service pavement performance."
The belief is that as the test sections are monitored over time, the underlying mechanism which relates the input factors of design, construction and service conditions to the measured performance will become known. Extension of pavement life and cost reductions for constructiong and maintaining pavements will result from application of these mechanisms to produce better designs and to devise better maintenance and rehabilitation practices.
In formulating the overall goal of C-LTPP, four distinct objectives were identified:
To evaluate Canadian practice in the rehabilitation of flexible pavements, and to subsequently develop improved methodologies and strategies.
To develop pavement performance prediction models and validate other models or calibrate them to suit Canadian conditions.
To establish common methodologies for long-term pavement evaluation, and to provide a national framework for continued pavement research initiatives.
To establish a national pavement database to support the preceding C-LTPP objectives as well as future needs.
Phase 1 of the C-LTPP project involved the construction and initial performance testing of 24 highway test sites on the major provincial highway system across Canada. Unlike the US-LTPP experiment where the performance of various types of pavement structures is studied, the C-LTPP project targeted a single type of pavement structure: new asphalt concrete (AC) overlays constructed over an existing AC pavement with granular base course.
The design of the C-LTPP experiment was strategically conceived to permit paired comparisons of adjacent highway test sections. Each test site contains a minimum of two to a maximum of four adjacent test sections for a total of 65 pavement sections (See the Map tab of this section.).
The use of adjacent sites allows for the comparison of different rehabilitation methods under identical traffic loading, climate and soil conditions. The alternative rehabilitation strategies employed on the C-LTPP test sections include:
Variable overlay thickness
Hot and cold-mix recycling
Inclusion of performance enhancing additives, or
A combination thereof.
The specific experiments under study are presented as follows:
Experiment Type Code
No. of Sites
Performance Comparison of Overlay Thickness (HMAC) - 2 adj. sections
Performance Comparison of Overlay Thickness (RAP) - 2 adj. sections
Performance Comparison of Overlay Material Type, HMAC vs. RAP - 2 adj. sections
Performance Comparison of Overlay Thickness (HMAC) - 3 adj. sections
Performance Comparison of an Overlay Additive or Mix Variation - 2 adj. sections
Combination of Experiments 1, 2 and 3
Combination of Experiments 1 and 3
Combination of Experiments 1, 3 and 5
Combination of Experiments 1 and 5
The C-LTPP project attempted to design and build the test sections across Canada so as to cover the widest range of experimental factors such as traffic loading, environmental region and subgrade type. This ensured that C-LTPP would encompass the majority of conditions under which pavements are constructed in Canada. The locations of the 24 C-LTPP Test Sites are listed with the As-Built Site Matrix, displaying the experimental design of the test sections with regard to the above rehabilitation strategies.
Again, see the Map section of this website for a graphical display of the test sections.
Monitoring of Sites
Each of the ten Provincial Highway Agencies participates in the C-LTPP project through the contribution and monitoring of in-service pavement test sites. Information on the original pavement structure was gathered prior to placement of the overlays in 1989 or 1990. Since then, the performance of each AC overlay has been monitored on an annual basis, and continued through the end of the overlay service life or 2004, which ever occurred first.
All pavement monitoring activities in C-LTPP were conducted according to two documents:
C-SHRP Pavement Research Technical Guidelines - which provides detailed procedures and protocols for each data collection activity as well as the data collection forms, and
Summary of C-LTPP Monitoring Activities - which provides a convenient overview of the annual data collection requirements
The types of data collected, responsibility for each and the fequency of testing is presented below.
Test Site Identification
Material Sampling and Testing
Prior, During and Immediately After Overlay Construction
Surface Distress Survey
Prior to Overlay, Yearly
Longitudinal and Transverse Profile
Benkleman Beam (Long-Term Changes)
Prior to Overlay, Yearly (up to 1995)
Benkleman Beam (Seasonal Changes)
Monthly, in one year
Benkleman Beam (Spring Factor)
Weekly, in 3 different years
Falling Weight Deflectometer
Every 2nd Year
Environmental Data (from Env. Canada)
Every 2nd Year
C-LTPP data has not been collected by the LTPP program.
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