Wastewater Treatment Plants
The capacity of Hungarian wastewater treatment facilities proved to be inefficient for the requirements specified by the EU, so in 2004 the expansion of several wastewater management facilities and the building of several new facilities were commissioned. DDC thus delivered large amounts of concrete products to wastewater treatment facility construction works in – among others – Szeged, Bőcs, Csepel, Dunakeszi and Northern Pest. From the viewpoint of concreting and the design of the concrete composition high strength, watertight and corrosion resistant features were the main requirements. To this end our experts used the MSZ EN 206-1:2002 standard CEM III/B 32,5 N-S type sulphate-proof slag cement.
The most important factors for the special, sulphate-proof concrete were the following:
- low permeability, water-tightness
- high resistance to chemical aggression, sulphate resistance
- low heat of hydration, low calorification, crack resistance
- moderate hardening, remarkable post-hardening
- good workability
- the fresh concrete should be workable at 3 hours
- at 8 hours it should be hardened so the formwork can be removed
From the perspective of concrete technology a very special task was performed. The properties expected from the concrete as well the conditions of concreting were extreme. CEM III/B cement is excellent for making hydraulic engineering elements. The well performed task confirms that concretes made with specially developed cement can be deployed in a wide range of technical applications.
