Manhole Rehabilitation

As you can imagine, the environment inside a manhole is quite corrosive due to the hydrogen sulphide gas that is produced by the wastewater.

Most manholes are concrete, or brick with a concrete mortar between them. Concrete is porous. Acid from the wastewater is able to enter through the "pores" of the concrete, and a chemical reaction occurs in the cement and changes its structure. The cement turns into gypsum, a white, chalky substance (that makes up drywall), and the rocks, or aggregate, in the concrete are left to crumble away.

These manholes begin to leak wastewater, which contaminates the groundwater supply, and the natural environment nearby.

Manhole rehabilitation is the solution to deterioration! There is no need to replace manholes that are crumbling and leaking. Rather than replacing them, we repair the manholes to a better-than-new condition, all without digging them up! Our proprietary cement liner material will renew the structure, stop water infiltration, fill voids, and build up deteriorated brick and concrete surfaces. Our system utilizes microsilica sand added to the concrete mixture to reduce the permeability of the concrete, thereby preventing the chemical attack of the wastewater.

The photo in this section shows the pristine interior of a freshly rehabilitated sanitary sewer manhole. (Photograph courtesy of Standard Cement Materials, Inc.)