Phase-theory driven development of glasses and methods for the preparation of continuous protective glass layers on concrete.

• Applicants: Dr. Andreas Prange; Professor Dr.-Ing. Michael Raupach
• Subject Area: Construction Material Sciences, Chemistry, Building Physics
• Term: from 2013 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 249697913

This grand proposal describes the development of inorganic glass materials and a suitable application process for the production of glass coatings for the protection of concrete surfaces. Differently from the original research proposal, thermal persistent intermediate layers shall be investigated to endure the short timed temperature exposure while flamespraying to enable an application of glass of between 200 to 1000 micrometre.The flamesprayed glass layers are supposed to act as protection of the underlying concrete against acidic solutions, such as biogenic sulphuric acid in sewage systems, as well as other acid attacks, chlorides or carbonation. Furthermore, a use as architectural facade material concerning gloss, colour and texture is considered. The objective is the development of impermeable, durable, adhesive, and environmentally responsible layers of glass for the protection of concrete. The method for application is flame spraying. The results so far show, that a layer of a thermal persistent material is needed for the successful application. For this, thin layers of a basalt mortar shall be used which proofed to be able to endure the short timed heat exposure, but are detached from the concrete due to the steep thermal gradients. The influence of extreme short timed heat exposure as well as the influence of steep thermal gradients shall be investigated.The objective if based on fundamental research though considering all aspects prohibiting a later use in building constructions.

• DFG Programme: Research Grants