Two initial studies on the degradation and corrosion of concrete in biological treatment_x000D_ plants were conducted in 2009/2010 within the two Waste Refinery Projects WR-27 and_x000D_ WR-34. The results show that concrete does not have sufficient resistance in the current_x000D_ aggressive plant environment. Furthermore, it is stated that some form of surface_x000D_ protection coating is needed to ensure the good performance of concrete constructions,_x000D_ and that the coating system must be able to withstand the aggressive environment and the_x000D_ traffic that occurs on site. A proposal for a test program was subsequently developed and a_x000D_ third study proposed with the aim to evaluate and verify the proposed testing methodology_x000D_ based on laboratory testing on selected products and systems. Results from this third study_x000D_ are presented in the report._x000D_ Methods relate to resistance to leachate in combination with high temperature and wear._x000D_ Testing was conducted in collaboration with manufacturers and contractors, who also_x000D_ funded their own testing. Before the actual test was conducted, however, the methodology_x000D_ was modified and adapted to the application biological treatment facilities in a pilot study._x000D_ The aim of the laboratory study was to provide:_x000D_  Methodology for testing the resistance to leachate in biological treatment plants._x000D_  Methodology for testing the resistance to wear in biological treatment plants._x000D_  Specification developed specifically for surface protection of concrete in biological_x000D_ treatment plants._x000D_ These objectives have been met._x000D_ Test results in terms of resistance to leachate and resistance to wear, according to proposed_x000D_ methodology, are presented in this report for a wide range of products and systems. The_x000D_ results vary widely for different types of systems and reasons for this are discussed in some_x000D_ detail._x000D_ The project is expected to be followed by field testing at appropriate plants._x000D_ Finally, the project will also connect to an SBUF project (the construction industry's_x000D_ organization for research and development) initiated by the Swedish mastic asphalt_x000D_ association for the implementation of tests in the current Waste Refinery project, but also_x000D_ for more detailed studies of the components (aggregates and binders) in selected mastic_x000D_ asphalt products particularly suitable for biological treatment plants, and for future field_x000D_ testing. Id of the SBUF project is 12553.