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Quikrete Sand/Topping Mix is a preblended portland cement and graded sand for repairing and resurfacing concrete less than 2 in thick. It reaches 5000 psi at 28 days per ASTM C109 and goes down at 1/2 to 2 in, so it suits steps, walks, floors, large cracks and chimney caps rather than structural pours. Each 10 lb bag yields about 0.08 cu ft and needs only water. Compared with a full concrete mix, it is finer and made for thin overlays; compared with a patching compound, it covers larger areas and builds more thickness.
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Quikrete Sand/Topping Mix No. 1103 is a blend of portland cement and commercial grade sands. It is made for repairing and topping damaged concrete less than 2 in thick. Uses include patching and leveling steps, walks and floors, large crack repairs and chimney caps. It is also used for thick setting beds for ceramic floor tile and for filling the cores of block or brick.
The mix exceeds the ASTM C387 compressive strength requirement for high strength mortars. Typical strength is 3000 psi at 7 days and 5000 psi at 28 days. One 10 lb bag yields about 0.08 cu ft, so you can mix only what a small repair needs. Used dry, it can serve as a 1 to 2 in bed and joint fill for brick or flagstone patios and walks.
Just add water. Mix by hand in a container or in a mortar or barrel mixer. Start with about 1 pint of water per bag and add up to 1-1/2 pints for a workable, plastic consistency with no dry pockets. Remove all broken, loose and unsound concrete first, and make sure the repair has a vertical edge of 1/2 in or more. Saturate the area with clean water, leaving no standing water. Keep the repair moist for 5 days at 70 F or warmer, or 7 days between 50 F and 70 F. Protect it from freezing for the first 48 hours.
