Analysis of causes of cracks and corrosion of reinforced concrete walls and balcony slabs in a multi-storey building with an upward extension
Jaśniok M., Jaśniok T.
This article presents an analysis of damage to reinforced concrete slabs and walls in two unoccupied lowest stories of the multi-family building with a few-storey upward extension incompatible with the design. A significant increase in loading caused by that extension was supposed to cause cracks in walls and floors at the lowest stories. Moreover, rainwater penetrating cracks for 25 years was expected to induce corrosion of concrete and reinforcing steel reducing the load capacity of structural members. Strength tests, measurements of the reinforcement and tests on protective properties of concrete cover to reinforcing steel were performed as part of evaluating conditions of the structure. Test results included in numerical calculations of the structure model, provided the clear finding that concrete shrinkage was the reason for cracks in reinforced concrete slabs and walls. Thus, the upward extension did not cause damage to the structure, and concrete maintained its mechanical and protective properties to reinforcement despite the long-term effect of rainwater.
Ochrona przed Korozją, vol. 63, nr 3, 2020, s. 72-77
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