Sprayed Polymer Concrete for the Rehabilitation of Sewage Systems

Abstract:

Concrete sewage systems can be severely damaged when attacked by biogenic sulfide corrosion. While minor aggressive exposures can be accounted by using a high sulfate resistant cement, higher concentrations of acid (pH 3.5) require the sealing and protection of concrete surfaces. Throughout the decades, polymer concrete (PC) has been used in sewage systems due to its high acid resistance. However, it has been limited to newly constructed pipes and manholes as well as local repair. In cooperation with Massenberg GmbH, the Institute of Building Materials Research of RWTH Aachen University developed a new way of applying PC for the rehabilitation of damaged concrete surfaces of sewage systems; by dry spraying an epoxy mortar on concrete, layers with an average thickness of 20 mm on vertical and overhead surfaces were successfully produced. The dry sprayed PC was examined for its overall performance such as strength, adhesion, thermal expansion, and wear. A special focus has been put on the diffusion properties and the durability in an acidic environment. Based on these positive laboratory results, a first practical application in a waste water structure is currently underway.

• Periodical: Advanced Materials Research (Volume 1129)
• Pages: 460-467
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1129.460
• Online since: November 2015
• Authors: Robert Schulte Holthausen*, Michael Raupach
• Keywords: Diffusion, Dry Spraying, Polymer Concrete, Rehabilitation, Repair, Sewage System, Sulfuric Acid, Surface Protection

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