The manhole rehabilitation process begins with preparing and cleaning the surface of the structure, usually by means of high pressure water. After cleaning, active leaks are stopped, specially designed mortar is applied using a shot-crete nozzle or centrifugally using the Mainstay Mortar Spinner. While the mortar is still soft, epoxy is applied. The simultaneous applications of the mortar and epoxy results in a monolithic bond that is extremely resistant to corrosion.
There is no wait time for the mortar to cure after it is applied to the manhole because the epoxy topcoat is applied while the mortar is still soft. Therefore, the manhole rehabilitation system can be installed quickly, and deteriorated manholes and other structures can be repaired and put back into service in a single day. This reduces labor costs and saves time. The need to mobilize twice is also eliminated due to the concurrent application of the cement mortar and epoxy coating.
This manhole rehabilitation system is also specifically designed for use in moisture laden environments. Surfaces in manholes and lift stations are often continuously damp, making it nearly impossible to apply a protective coating alone. Cementitious products used in the Mainstay Composite Liner are properly applied when the surface of the concrete or brick manhole remains damp, eliminating the tedious task of drying the substrate prior to application.
One main component of the Mainstay Composite Liner is Mainstay ML-72 Sprayable Microsilica Restoration Mortar. It is a high-build manhole restoration mortar that can be applied to vertical manhole surfaces up to 5″ thick, often restoring the manhole substrate to its original thickness. The cured mortar has a compressive strength of 10,000 psi, resulting in a rehabilitated manhole that is stronger than the original structure.
Mainstay DS-5 is a 100% solids epoxy coating. This highly corrosion resistant coating contains no solvents and may be applied to the manhole up to 125 mils in a single coat.
Manholes can have their lifespan extended significantly with the Mainstay Composite Liner, which has a 50-year design life.