Importance of Self-leveling Overlays in concrete construction
Self-leveling overlays are set up rapidly. It is possible to place and finish more product each day, each worker as compared to any other cast-in-place decorative product.
Self-leveling overlays become effective when substrate conditions are less than standard: obsolete or worn concrete surfaces, unflat or unlevel floors, and concrete surfaces getting damaged with other floor treatments.
Self-leveling overlays are normally used in commercial building lobbies and corridors, retail spaces, residential floors, restaurants, and warehouse floors.
Self-leveling overlay products are susceptible to atmosphere conditions. Due to this, most applications are kept in controlled indoor environments. Specific jobsite conditions should be administrated with the purpose of attaining the following results :-
• Keeping uniform temperature
• Managing air movement to remove drafts
• Protecting from the direct sunlight to the work area
• Maintaining even relative humidity all through the jobsite
There should be a good bond among the subfloor and an overlay, so exact mechanical preparation of the accessible slab is vital. Bead-blasting equipment and diamond grinders are commonly applied tools but scarifiers are also utilized, particularly for thicker placements. The size of the required equipment is based on the size of a project concerning productivity.
The floor covering failures occur due to extreme moisture conditions in a subfloor and it should be examined properly prior to start any construction work.
Self-leveling overlay products are formed by mixing cement, fine aggregates, pozzolans, and admixtures comprising of superplasticizers, polymers, shrinkage compensators, and other components. Manufacturers' mixing instructions need applicators to mix a proper amount of water with each bag of material to attain the desired properties.
Initially, the material is placed on a sub slab, the average working time is only about 12 minutes, accompanied quick strength formation. Regular application thicknesses commence at about ¼ inch but can go beyond 2 inches devoid of shrinkage or cracking problems.
The toughened product is very solid and long-lasting and it contains compression strengths of roughly 6000 psi, and attains good flexural strengths.
When inherent colors are added to self-leveling overlays, the final product demonstrates strong color devoid of any efflorescence.
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