AURUM KCII, Cologne, DE

StoCrete TS 136 for Concretes of Existing Concrete class A3*)

The AURUM KCII, House 12, in Cologne, Germany, has been completely redeveloped. The four-storey residential and commercial building has been completely gutted, the facade was preserved.

The specialist planners for concrete repairs from IBE-Ingenieure from Hennef, Germany, carried out a detailed structural inspection and damage analysis, from which they defined the repair measures for the existing building. The properties determined, compressive strength and surface tensile strength, as well as the modulus of elasticity, classified the concrete in existing concrete class A3*) . For this reason, the investor and planner opted for the proven StoCretec expertise. The 4,300 square metres of ceiling soffits, the beams as well as the columns were reinforced with the dry-sprayed concrete StoCrete TS 136. After removing large areas of the damaged existing concrete, the applicator, T.O.M. Technical Surface Management, applied the concrete repair product using the dry-mixed spraying process. StoCrete TS 136 was applied onto the ceilings, 25 mm onto the beams and 30 mm onto the columns in layer thicknesses of on average 20 mm.

The dry-mixed spray StoCrete TS 136 is polymer-modified and cementitious. It was especially developed for the repair of low-modulus concrete of existing concrete class A3*). The concrete repair product is non-combustible and has been tested for fire resistance class F120 (ETK). It is characterised by its low shrinkage and meets the requirements for repair products for concrete structures with static involvement. Its low modulus of elasticity ensures a stable bond with the existing concrete and the durability of the multi-layer model.

Download project report here | PDF 0,7 MB

*)Existing concrete: In its Technical Rule on the repair of concrete structures (German original: Technische Regel „Instandhaltung von Betonbauwerken“, version: May 2020), the Deutsches Institut für Bautechnik (German institute for structural engineering) has defined 5 categories of existing concrete (A1 to A5). The term ‘existing concrete’ refers to concrete that has already been installed in buildings and structures as opposed to concrete material yet to be installed. In German, these categories are called ‘Altbetonklassen’ which translates to ‘classes of existing concrete’. Existing concrete is categorised according to its compressive strength and surface tensile strength. Before repairing existing concrete, its ‘Altbetonklasse’ needs to be determined in order to select a suitable mortar or concrete.