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Three additional Hybrid Composite Culvert Repair Systems have been successfully installed in Ebeemee and Indian Townships in central Maine, US.
Developed by Kenway and the University of Maine’s Advanced Structures and Composites Center the Hybrid Composite Culvert Repair System is described as utilising pre-engineered light-weight composite panels that conform to the existing culvert pipe with minimal invert change.
According to Kenway, the Hybrid Composite Culvert Repair System has many advantages compared to total culvert replacement or traditional repair methods. Composite panels install quickly and easily with little need for heavy equipment, there is minimal culvert invert change, the process is less disruptive to the environment, there is reduced “in stream” time, traffic disruption is minimal, project duration is reduced and overall costs are less.
Kenway claims that composite panels are built, inspected and fully cured before leaving the factory. Properly formulated, composite panels comply with FDA regulation 21 CFR 177.2420 associated with materials intended for repeated use in contact with food. Unlike other composite culvert repair methods, such as Cured-In-Place (CIPP) rehabilitation, there is no styrene or chemical leaching from the composite panels and components. It explains that utilising pre-manufactured composite panels eliminates the risk of elevated PH levels in the water, a common issue associated with curing concrete used in traditional culvert repair methods.
Kenway also claims that the lifespan of the highly corrosion, abrasion and impact resistant composite panels exceeds 75 years, providing a maintenance free timeframe that exceeds those of galvanised steel or concrete culverts. Composite panels also allow the easy attachment of pre-manufactured fish weirs and ladders that are now required in many locations and can be customized to meet each sites particular need.
A review of Kenway’s first Hybrid Composite Culvert Repair Rehabilitation project installed in 2009 in Amherst Maine is performing well and has demonstrated the system’s ability to withstand Maine’s extreme fluctuating weather conditions. Kenway says its Hybrid Composite Culvert Repair System represents a significant opportunity for transportation agencies looking to maintain road safety and meet environmental regulations with increasingly tight budgets.
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