A landmark five-year study conducted by researchers at the University of Waterloo’s Centre for Pavement and Transportation Technology has confirmed what the polyurea industry has long maintained: high-performance polyurea coatings applied to concrete and steel infrastructure can realistically extend service life by 40 to 60 years under typical Canadian climate conditions.
The study, published in the Canadian Journal of Civil Engineering, followed 34 infrastructure assets across Ontario, Alberta, and British Columbia that had been coated with polyurea systems between 2018 and 2020. The control group consisted of 34 comparable structures treated with conventional cementitious or epoxy coatings.
Key Findings
After five years of field observation and annual inspection, the research team documented significant performance differences between the polyurea-coated and control assets:
- Polyurea-coated structures showed 94% less chloride-ion penetration than control structures in high-chloride exposure environments
- No adhesion failures were recorded on properly prepared polyurea-coated surfaces; control structures showed 17% adhesion failure rates
- Thermal cycling performance (critical in Canadian climates) showed zero crack propagation in polyurea systems versus an average of 1.3 new cracks per meter per year in cementitious controls
- Maintenance cost differential over five years: $0.42/m² for polyurea versus $3.17/m² for control coatings
“The data strongly supports specifying polyurea as the primary protective coating for assets with 30-plus year design lives,” said lead researcher Dr. Priya Malhotra. “The upfront cost premium — typically 15-30% over cementitious alternatives — is recovered within 8 to 12 years through reduced maintenance alone, independent of any service life extension benefit.”
Implications for Canadian Infrastructure Procurement
The timing of this study is significant. Canada faces an estimated $110 billion municipal infrastructure deficit, with water and wastewater assets representing the largest single category. As discussed in our recent analysis of climate pressure on Canadian infrastructure, rehabilitation is almost always more cost-effective than replacement.
The research team’s lifecycle cost model demonstrated that for a typical municipal water storage tank with a 50-year design life, the polyurea coating option produced a net present value saving of $340,000 per structure versus conventional coatings. For a municipality managing 50 such structures, this represents a $17 million lifecycle saving.
Study Limitations and Future Research
The researchers noted that the five-year observation window, while significant, does not allow direct observation of the predicted 40-60 year service life improvement. Accelerated laboratory testing was used to extrapolate long-term performance, which introduces inherent uncertainty. A 10-year follow-up study is planned, with preliminary results expected in 2028.
Additionally, the study focused on pure polyurea systems; performance data for hybrid polyurea-polyurethane systems is not yet available in the same depth. The CPCA has flagged this as a research gap and is seeking to commission a companion study.
Download the Full Report
CPCA members can download the full research report from the member resources portal. A public summary has been submitted to Infrastructure Canada and is under review for inclusion in the federal infrastructure specification guidance documents.
For practical application guidance informed by this research, see our technical guide on Concrete Rehabilitation With Polyurea.
Questions about this research or its implications for your projects? Contact the CPCA technical committee.