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Quikrete Fast-Setting Concrete Mix is a 50 lb. bag of preblended cement, sand and gravel that hardens in 20 to 40 minutes and reaches 4000 psi in 28 days. Its main trick is post setting: pour the dry mix into the hole, soak it with water, and skip the wheelbarrow. It also works for steps, sidewalks and small slabs where a fast cure matters. Against standard concrete mix, it trades working time for speed, so it suits fence, mailbox and lamp posts rather than big pours you need to finish and trowel.
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Owners mostly use it for fence and mailbox posts and like that they can skip mixing. Complaints center on the fast set leaving little time to adjust a post and on how many bags a larger slab takes.
Quikrete Concrete Mix Fast-Setting PSI-4000 is a combination of quick-setting cements, sand, and gravel. It is designed to harden within 20 to 40 minutes. It meets ASTM C387 standards and reaches 4000 psi strength in 28 days.
Posts can be set without mixing the concrete. Pour the dry mix into the hole, then soak it with water. It is used for setting mailbox posts, fence posts, and lamp posts. It also suits steps, sidewalks, and slabs where a quick set time is needed.
