What key differences exist between materials and construction requirements for partial-depth and full-depth concrete repairs?

Partial-depth concrete repairs address surface defects that do not extend through the entire thickness of the concrete slab, while full-depth repairs involve removing and replacing the entire slab thickness. This fundamental difference dictates variations in materials and construction requirements. For partial-depth repairs, rapid-setting concrete or epoxy mortars are commonly used to allow for quick return to service. These materials are designed to gain strength quickly and bond effectively to the existing concrete. Full-depth repairs typically use conventional concrete mixes, often with modified designs to accelerate strength gain. The type of cement, aggregate gradation, and admixture usage may differ to achieve desired performance. Partial-depth repairs require careful surface preparation to ensure a good bond between the patching material and the existing concrete. This includes removing loose and deteriorated concrete, cleaning the surface, and roughening it to improve adhesion. Full-depth repairs involve removing the entire slab, preparing the subbase, and ensuring proper drainage. Dowel bars or tie bars may be used to provide load transfer between the new slab and the adjacent slabs. Curing requirements also differ. Partial-depth repairs often require special curing compounds or methods to prevent rapid moisture loss and ensure proper hydration of the patching material. Full-depth repairs require standard concrete curing practices, such as wet curing or the application of curing compounds. Load transfer is a critical consideration for full-depth repairs. Dowel bars are typically used to transfer load across the joint between the new slab and the existing slabs, preventing faulting. Partial-depth repairs do not typically require load transfer devices. Finally, the size and shape of the repair area also influence material selection and construction requirements. Partial-depth repairs are typically used for smaller, localized defects, while full-depth repairs are used for larger, more extensive areas of damage.