Contents
Can you pour cement over gravel?
Laying a concrete driveway over an existing gravel one is possible, but it is not generally recommended. The kind of gravel that is intended to go under cement is typically a smaller grade than what is used for gravel driveways.
How do you put down a rock before pouring concrete?
Spray the gravel with a light mist of water, just enough to settle the gravel dust. Compact the gravel with either a plate compactor or a hand tamper. If you use a plate compactor, run it over the gravel to pack the material tight. Push the plate compactor slowly from side to side, running in an east-to-west direction.
What happens if you don’t put gravel under concrete?
Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab.
Can you sprinkle dry cement over gravel?
They should have gravel under then sand on the gravel to provide stabilization and drainage. Dumping Portland cement on them will just make a mess. regardless of size or base support, sprinkling dry cement and letting rain supply water is not a good solution because You can’t control the amount of water added.
Can I pour concrete directly on dirt?
Long story short, yes you can pour concrete over dirt.
What kind of stone goes under concrete?
You do need gravel under a concrete slab, footing, or patio. Gravel provides a solid foundation for your concrete as it can be compacted. It also improves drainage, preventing water from pooling beneath the concrete.
Should you put plastic under concrete?
A concrete vapor barrier is any material that prevents moisture from entering a concrete slab. Vapor barriers are used because while fresh concrete is poured wet, it’s not supposed to stay that way. It needs to dry and then stay dry to avoid flooring problems. This is why a vapor barrier under concrete is essential.
How do you stabilize gravel?
The best long-term solution for driveway stabilization includes digging down 8 to 12 inches below the surface of the driveway, removing all roots and plant material, and thoroughly compacting the soil with a plate compactor or roller. On top of this compacted sub-grade layer, put down a 4-inch layer of coarse gravel.
Is it OK to put concrete over river rock?
The concrete is too thick to move down in between the stones if it’s more than an inch or so. We had river rock along both sides of our house before we put in concrete. The contractor removed most of the rock before laying the concrete. The concrete.,.over the bottom layer of stones…is about four inches thick. Gad.
Is it easy to pour concrete over concrete?
Every so often, a construction team or a DIYer will come upon a problem that’s difficult to solve with conventional knowledge. One such problem involves pouring new concrete over an existing concrete structure. On its face, this appears to be a simple enough procedure.
What’s the best way to clean old concrete before pouring new?
Clean the old concrete First – pressure wash it, vacuum it, remove any dirt, debris, or loose concrete. If you’re new concrete is under 3″ thick, apply Weld-Crete, let it dry at least 1 hour, then you’re ready to pour your new concrete.
Do you mix new concrete with old concrete?
Once you’ve properly applied your bonding agent, you’re ready to mix up your new concrete and pour it into the mold. Ideally, you should choose a similar concrete mix ratio to your old concrete slab. This will help the new and old slabs work together effectively when mitigating both lateral and horizontal pressure.