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Before the oversite concrete is laid it is usual to blind the top surface of the hardcore. The purpose of this is to prevent the wet concrete running down between the lumps of broken brick or stone, as this would make it easier for water to seep up through the hardcore and would be wasteful of concrete. To blind, or seal, the top surface of the hardcore a thin layer of very dry coarse concrete can be spread over it, or a thin layer of coarse clinker or ash can be used. This blinding layer, or coat, will be about 50 mm thick, and on it the site concrete is spread and finished with a true level top surface.

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What is Blinding in construction?

Blinding in construction refers to a layer of material, typically concrete or a similar substance, that is laid on top of the subgrade before the main structural elements are built. Its primary purpose is to create a smooth, level surface for subsequent construction activities, such as laying foundations or flooring. Blinding also helps protect the underlying soil from moisture and contamination, ensuring a stable base for the structure. Additionally, it can serve as a barrier to prevent the upward migration of soil particles into the concrete.


What is blinding and trimming enabling works?

Blinding and trimming enabling works refer to preparatory activities in construction that involve creating a level and stable base for subsequent work. Blinding typically involves pouring a layer of concrete or other material to protect the foundation and provide a clean surface for additional construction. Trimming, on the other hand, involves adjusting the ground or edges to ensure proper alignment and elevation before further construction phases. Together, these processes help ensure the integrity and accuracy of the building project.


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