In this image, the manhole is shown after high pressure cleaning and removal of the soft decayed conventional concrete layer. Dynastone® repair material will be applied directly on top of this material.  The dark material shown on the shelf is from a former repair job using a silicate-based product and could not be removed by high pressure (3500 psi.) washing.

The first step of the repair procedure is to patch the inflow and outflow pipe junctions and build up the shelf area to minimize wetting of the shelf and insure rapid draining during surcharge events. Sealing the junctions between the manhole and the incoming and outflowing pipes provides positive containment of the sewage within the system and prevents infiltration of groundwater from outside.

This image shows the repair performed at the pipe-manhole junction.

This image shows the Quadex/Dynastone® mortar being applied by a centrifugal pump.  The mortar is applied to a depth of at least ¾”. When the proper amount has been applied, a worker will hand trowel the surface to smooth and finish the job.

The finished job.