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Spray-On Materials Used in Manhole Repair

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The chemical and physical nature of the surface of manholes is complex and may contain exposed aggregate, sand, unhydrated cement particles and cement gel, together with cracks and voids. The surface moisture content may also be variable. Surface treatments applied should remove any contamination and mould release agents. The rheological characteristics of the primer are also important. Low viscosity materials are beneficial for penetrating into, and binding together, surfaces such as concrete, which are porous and may be fractured.

Spray-on materials bond to existing structure materials primarily by attaching to their surfaces within a relatively thin layer. The spray-on material is a liquid that will flow into the irregularities of an existing surface and interact with its molecular forces. The sprayon material then solidifies and bonds to the existing structure. The basic requirements for good bond are friction between the adhesives and substrate, an absence of weak layers, or a contamination at the interface.

There are a large number of coatings that can be used for manhole repairs and rehabilitation. Therefore, it is necessary that these materials be categorized based on their composition and their characteristics. Design guidelines and considerations for curing and hardening also test programs are presented in this paper for the users of spray-on materials in manhole repair and rehabilitation.

Document Type: Research Article


Publication date: 2003-01-01

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