Despite the high strength of concrete structures, over time it can collapse due to the influence of various factors. Especially sensitive to them is initially unprotected or unshored concrete. In this article we would like to tell you what factors influence the appearance of both small and large cracks in concrete, and also whether it is possible to avoid their occurrence initially.
Factors that influence the occurrence of cracks in concrete
Usually, after pouring concrete, it is reinforced with special compounds that make concrete surfaces wear-resistant and durable.
If this is not done or done in bad faith, then the occurrence of cracks will not take long. Below are examples of the most common factors that cause cracks in concrete.
Changes in air temperature
We know that concrete is a porous material.
And if it is not protected by special compounds, moisture will penetrate into the pores of the concrete. When the temperature of the air and the surface change, water molecules have the properties of expanding and narrowing. Unprotected concrete is negatively affected by temperatures below 0 °C, as water molecules expand, creating pressure on the concrete pore walls, which leads to the appearance of microcracks in the material, which increase over time. Thus, due to temperature fluctuations plus the influence of moisture, the concrete cracks and gradually collapses both from the outside and from the inside.
This is due to the fact that all corners, bends and similar parts of the structure need additional strengthening, since it is in such places that concrete is most vulnerable.
As for carbonation, it is a process in which concrete reacts to an environment saturated with carbon dioxide. Naturally, there is no negative impact on the concrete itself, but there is an impact on the rebar - it is exposed. And this, in turn, leads to cracks in the concrete and the appearance of rust on the rebar.
Reacting, they lead to destruction of various types, such as cracks, fractures, etc.
Even at the stage of pouring concrete, you should think about its durability. Since the material can initially be incorrectly poured, which no additional protection will help. For example, in hot, cold, windy weather, it is necessary to use plasticizers - additives that are used at the stage of mixing concrete mortar. If the pouring of the material takes place under normal conditions, then it is necessary to choose a suitable hardening compound for freshly laid concrete. Also, when pouring a sufficiently large area, you should not forget about cutting seams that will prevent cracking of concrete in the future.
You can get acquainted with high-quality materials for protecting concrete by following the link.
