Concrete is formed by providing a wet layer of a first concrete 4, applying a second wet layer 6 of concrete on the first layer 4 of wet concrete and setting the layers 4 and 6 to provide a composite concrete structure, wherein at least one of the layers comprises, AACM (Alkali-Activated Cementitious Material). An ionic bond 2 is formed between the two layers. The AACM layer may comprise a reinforcement structure and cathodic protection.

A method for producing cathodic protection for protecting reinforcing steel (2) in a reinforced concrete structure (1) is provided, in which reinforced concrete structures subjected to chloride-induced corrosion can be simply and durably protected against corrosion. Furthermore, the cathodic protection is also intended to be producible particularly quickly both for new buildings as well as when carrying out renovation/retrofitting work. For this purpose, a textile-reinforced concrete (8) is applied to the reinforced concrete, wherein the textile-reinforced concrete (8) comprises a carbon fabric (10) and a mortar, wherein a continuous electrical voltage is applied between a cathode and an anode and wherein the reinforcing steel (2) is used as the cathode and the carbon fabric (10) is used as the anode.

A galvanic anode system for the corrosion protection of steel in concrete includes a galvanic anode material, which includes of zinc and alloys thereof, embedded in a solid electrolyte, and is characterized in that the galvanically available surface is larger, preferably at least twice as large, as the total geometrical surface of the metal anode. The galvanic anode system is also characterized in that, during operation, during which the anode disintegrates as a sacrificial anode, the galvanically active anode surface is reduced only slightly, preferably is not reduced up to at least 50%, in particular 75%, of the time during use.