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INSTRUCTORS:
Norman E. Kampbell, P.E.
Brett Paige, PE
Keith Walker
Purpose and Background
These presentations were recorded at the UESI Pipelines 2025 Conference.
Calculating the Cementitious Liner's Load Response to Produce an Efficient Wall Thickness (27 minutes)
This presentation focused on the engineering fundamentals behind designing cementitious liners for pipeline rehabilitation. The speaker emphasized the importance of distinguishing whether a liner behaves in bending or compression under load, as this directly affects design thickness and safety factors. Using the arch rise parameter, engineers can analytically predict liner performance and avoid over- or under-design. Examples demonstrated how variables such as cover depth, radius of curvature, liner thickness, and arc angle determine the stress distribution. Case studies showed how small arch rise parameters lead to bending-dominated behavior, while larger ones result in compression-dominated response. The discussion underscored the need for soil–structure interaction considerations and reestablishing stability when voids or cracks exist. Ultimately, the presentation provided practical equations and design approaches to ensure efficient, durable cementitious liner applications.
Des Moines Water Reclamation Authority Rehabilitates 78-inch Reinforced Concrete Trunk Sewer Using Trenchless SpinCast Methods (30 minutes)
This presentation highlighted the Des Moines Water Reclamation Authority’s efforts to rehabilitate a critical 78-inch reinforced concrete trunk sewer using trenchless spin-cast technology. The project emerged from a system-wide risk-based assessment of pre-2004 sewers, which revealed significant corrosion, wall loss, and structural vulnerability. Multi-sensor inspections with CCTV, LIDAR, and sonar helped prioritize high-risk assets for rehabilitation. The selected trenchless method minimized bypass pumping, avoided excavation risks near an EPA Superfund site, and reduced project costs. A cementitious liner with antimicrobial additives was pneumatically applied in multiple passes, restoring structural capacity and providing long-term resistance to corrosion and microbial attack. The project delivered a cost-effective, minimally disruptive solution while extending the service life of one of the region’s largest conveyance assets.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Explain how the arch rise parameter determines whether a cementitious liner responds in bending or compression.
- Describe how design variables such as cover depth, radius of curvature, and liner thickness influence liner safety factors and deformation.
- Discuss how multi-sensor inspections and risk analysis guide prioritization of large-diameter sewer rehabilitation.
- Identify the advantages of spin-cast cementitious lining in minimizing bypass, surface disruption, and long-term corrosion risks.
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-test assessment (true-false, multiple choice, and/or fill in the blank questions).
Who Should Attend?
- Utility and Pipeline Engineers
- Design and Consulting Engineers
- Construction Contractors
- Project Managers
- Academic and Professional Researchers
- Early Career and Pipeline Professionals
How to Earn Your CEUs/PDHs and Receive Your Certificate of Completion
To receive your certificate of completion, you will need to complete a short post-test and receive a passing score of 70% or higher within 1 year of purchasing the course.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]