Drainage system restoration with BETOGLASS®

In order to protect a heavily damaged part of their sewage system from corrosion, Emschergenossenschaft (the water resources office in Essen, Germany) coated the sewer with BETOGLASS®.

The sewer in Gelsenkirchen, running parallel to the Schwarzbach (a tributary to the Emscher river) since 1998, is in need of restoration. Project manager Thomas Voßmerbäumer explains: "We discovered corrosion, the concrete surfaces of the sewer had been heavily eroded in parts. In the affected area the waste water of the Schwarzbach is drained into the sewer via a shaft. This drop results in turbulence and, more importantly, to the release of hydrogen sulphide. We discovered that the damage was caused by biogenic sulphuric acid." Corrosion caused by biogenic sulphuric acid results in dissolving sulphate attacks on cement as well as a volumetric expansion effect.

Emschergenossenschaft had already successfully restored a pumping station well and a sludge spreader in a sewage treatment plant with BETOGLASS® in 1996. Even after 10 years of continuous use BETOGLASS® does not show any signs of ageing or wear. Due to this positive result the BETOGLASS® procedure was awarded the contract to renovate sewer DN1600 and the accompanying shaft structure. Research confirms the resistance of BETOGLASS® against biochemical, organic and mechanical exposure in sewerage systems. BETOGLASS® is a proven product in waste water areas; however, this is the first time it has been applied in sewer restoration. This pilot project is accompanied by engineering reports and laboratory tests performed by the institute for construction research of the RWTH in Aachen, Germany.

Prefabricated arched BETOGLASS® components have been used - 1.2m wide, 1.5m long and 6mm thick, made from float and safety glass. Three of these elements completely cover the sewer walls. BETOGLASS® scored once again in this underground site - on account of its rapid assembly.

Glass as restoration material for sewerage systems offers even more advantages, explains professional engineer Thomas Voßmerbäumer: "The quality of the surface protection does not deteriorate, subsequent monitoring is simple - cracks and damaged joints are easily detected. Moreover, the material is chemically extremely resistant and not susceptible to ageing."

"Even when damaged BETOGLASS® remains operationally safe and reliable", assures BETOGLASS® managing director and engineer Peter Boe, "it remains watertight, stable, resistant to wear and fully functional."

The demand for sewer restoration in Europe is high: BETOGLASS® offers efficient and durable solutions. New materials for new applications: BETOGLASS®