Most of the older building get concrete cancer. Reo can be damaged by rust causing the effect on the balcony. Example of this is when we are inspecting a building cracking of the tiles along with the support joint external cantilever balcony. And after further investigation, we get breaking out of the broken concrete that leads to following issues.
The depth of the cover which was 10 millimeter which is approximately less than the required to the ideal depth of 45mm or this type of marine environment.
The upper part of which reinforcing steel bar get damaged up to 50% of steel which already degraded.
The second layer of steel bar can get rust although it is the central design of reinforcing steel.
The concrete around the bars easily broken out, demonstrating of the reinforced concrete slab element. As illustrated by the simplified diagram, concrete cancer at the base of the cantilever element is dangerous, and if it not fixed, that component will fail.
Usually, it is a ten years maintenance program and which created by the team of the qualified inspector. So you need to take preventative measures and check it from time to time and go through the plan of maintenance to avoid the costly replacements.
However concrete cancer can be considered as classed building defect, and therefore it needs to be disclosed to the issuer as a part of your duty. If you fail in communicating that may lead to an individual circumstance that can cause costly replacement to your building.
Rust coming out of cracked surfaces leads to the improper balance of the alignment of the concrete. And in such case steel which is inside of the concrete starts to rust and this also called as concrete cancer. And in this situation steel begins to expand more than three times of his actual size and crack the concrete and can expose out of the concrete surface. Once water penetrates through cracked cement, it then rusts and the steel embedded deeper in the cement is then exposed repeating the process until the building becomes structurally unsound.
The real challenge in repairing concrete cancer lies in developing a comprehensive structure-specific plan for the recovery manner, which must base on the accurate understanding of the problem in each part of the building. It will involve the development of simple solutions, the undertaking of trial patches to verify these solutions and the preparation of a detailed specification, which will deliver the most cost efficient and technically sound treatment. A more comprehensive approach to developing enough and proven solutions for the structure will, therefore, lead to fewer contract variations, avoidance of long delays, elimination of disputes and reduction of unnecessary and costly work.