Why is loose concrete removed from the surface where new concrete is to be done?

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Why is loose concrete removed from the surface where new concrete is to be done?..

Answer / amaregouda

To avoid the formation of micro cracks in construction joint and as well as to provide a proper bond between old and new surfaces.Usage of bonding chemicals is advised like nitto bond.

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Why is loose concrete removed from the surface where new concrete is to be done?..

Answer / piyush singh

Loose Concrete and Laitance is removed from the old surface of the concrete and in some cases Chemicals are also used such as Fosroc Nitobond Ep and others , so that a proper bond exists between the old and new concrete and any micro pores does not remains in the concrete which may lead to the leakage

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