Unlike reinforced concrete, unreinforced concrete is made of steel rods or mats without the so-called "reinforcement".
concrete is defined as concrete that is produced without reinforcement or with reinforcement that is less than the minimum reinforcement according to DIN EN 1992-1-1 para. 9.2.1.1.
Ready-mixed concrete is usually used, which is poured on site and hardens.
unreinforced concrete does not require the reinforcement of steel bars or mesh, which give reinforced concrete its name, it can only absorb low tensile stresses. This is about one tenth of its compressive strength. Therefore, when planning structures that are made of unreinforced concrete, care must be taken to ensure that the tensile strength of the building material is not required.
Above all, crack formation must be prevented, as cracks in unreinforced components can impair the operational or traffic safety of the structure and therefore lead to high maintenance costs.
Even with unreinforced walls, it must be ensured that the horizontal forces of the ceiling panes can be dissipated via the walls. In the case of unreinforced walls, measures must be taken to prevent shrinkage cracks. For this purpose, a ring anchor must be provided at the height of the ceiling panes.
Wall breakthroughs and other weakening of the cross-section often lead to cracks in unreinforced components.
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