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What is blinding in civil engineering?

Blinding is an important aspect of civil engineering that involves creating a level and flat surface for the foundation of a building or structure. It is a layer of plain concrete that is typically 50 to 100 mm thick and is laid over the prepared soil surface prior to the construction of the foundation.



The purpose of blinding is to provide a clean, level, and stable base for the foundation and to prevent the penetration of moisture and other contaminants from the soil into the foundation. This is particularly important for structures that require a high level of stability and load-bearing capacity, such as multi-story buildings and bridges.


The process of blinding begins with the excavation of the soil to the required depth, which is usually below the frost line. Once the soil is excavated, it is compacted and leveled to create a stable base. The next step is to lay a layer of blinding concrete over the prepared soil surface. The concrete is then spread evenly and compacted to ensure that it is level and has a consistent thickness.


Blinding concrete is usually made with a mixture of cement, sand, and coarse aggregate, and is often reinforced with steel mesh or bars to improve its strength and durability. The concrete mixture is chosen based on the type of soil and the expected loads that the foundation will be subjected to.


After the blinding concrete is laid and cured, the foundation construction can begin. The foundation is typically made with reinforced concrete or masonry blocks, and is built on top of the blinding layer. The blinding layer provides a stable and level surface for the foundation to be constructed on, which ensures that the structure will be stable and able to bear the intended load.


Blinding is a crucial aspect of civil engineering that provides a stable and level base for the foundation of a building or structure. It is an essential component of the construction process, as it ensures that the foundation will be stable and able to bear the intended load. By following proper blinding techniques, civil engineers can ensure the longevity and stability of the structures they design and build.

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