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Washington, DC
GeoSpray® Manhole Lining

Background

DC Water engineering had identified a route along Klingle Road in
Washington DC where the sewer pipe was in need of rehabilitation.
Though the pipe diameter was below the threshold for standard
application parameters for a spray lining, the client specified the use a
geopolymer for the manhole rehabilitation portion.
The 72” (1830mm) diameter manholes to be repaired were of brick
construction and had suffered deterioration resulting in cracked/missing
mortar, leaks and water infiltration, as well as several were in structural
distress.

Inland Pipe Rehab was selected as the contractor for the CIPP portion of
the pipe repair as well applying the GeoSpray geopolymer material.

Repair Decision
The GeoSpray geopolymer was specified for several reasons:
• Superior microbial induced corrosion resistance experienced in
sanitary sewer environments compared to OPC materials
• Proven field performance in manhole rehabilitation without cracking
that can be experience with CAC products
• Superior flexural and tensile properties
• Reduced time for surface preparation and compared to epoxy or
polyurethane based solutions

The GeoSpray was applied using a vertical centrifugal spinning system.
Voids in the brick manholes were first repaired with a hydraulic cement.
Where necessary, a chemical grout was first injected to stop any running
water infiltration through the voids. A 1” (25mm) thick application was
applied to create a structural repair.

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Washington-DC-Manhole-Case-Study

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