For concrete friends, concrete is a common building material. Concrete is a mixture of Portland cement, stone aggregate and steel skeleton. It is indispensable on the construction site. How long is the service life of concrete?
In fact, the life span of concrete itself can be compared with that of natural silicate stone. As we all know, the life span of mountain rocks in nature is counted in hundreds of millions of years. Concrete itself can reach this level when it is well protected, such as specimens in museums or artificial stones inside ancient Egyptian desert pyramids.
But as long as it is exposed to the environment, we should consider the weathering of the environment, whether it is tree rooting, biological growth, or wind, frost, rain, snow, flood and magma, which will have a significant impact on concrete, so the life of concrete will not be so long.
Furthermore, the life of steel bars, the tensile capacity of steel bars is an indispensable part of modern buildings, but it is also very easy to be oxidized and corroded in humid environment. The interior of concrete is initially alkaline environment, but under the action of carbon dioxide in the air, the PH value of concrete will slowly decrease and become acidic, which will produce solid calcium carbonate and other substances. If the concrete cover is not thick enough, even if the concrete itself is intact, the steel bar will be corroded and lose its tensile capacity, which will lead to the failure of the reinforced concrete component and the collapse of the building, which is the actual structural life of the concrete building.
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