Mountain Grout Strong
The two most common problems with Reinforced Concrete Pipes (RCP) are broken joints and separated joints. Most often, these problems are caused by freeze thaw cycles, vibration, piping, weakened bedding, poor installation or decomposing filter cloths (frequently several of these problems at once). In the past, the pipes were typically dug up and replaced, but that method proved to be costly and time consuming, often causing road closures and delays. New technologies have created more options for structures with 36” diameter and above at lower cost using a simple three step process:
- Seal the joint from the inside with a combination of oakum rope and a highly adhesive, flexible polyurethane resin.
- Seal the outside of the joint from the inside of the pipe with another flexible, adhesive, long-lasting polyurethane resin.
- Replace lost soils and fill voids with another polyurethane resin product that is light weight, load bearing, and highly expansive.
Cost always matters, so pay close attention to temperatures. Cold temperatures can slow the reaction timeof polyurethane resin and decrease its expansive properties. If installers are working in cold weather, heat the space if possible and always keep the polyurethane resin, hoses, and equipment in a temperature controlled environment (70°F and higher is ideal).
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