Can you pour concrete in two pours
If you know you are going to have a “cold joint” as you described, leave the surface rough—the best technique is to make a key way at the joining surface by using a length of 2×2 or 2×4 to form a key way when you do the first pour–remove the 2x before you do the second pour..
Do you need gravel under concrete
Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.
How do you attach concrete to new concrete
Drill 5/8-inch diameter holes six inches deep into the old concrete. … Flush the holes with water.Inject epoxy into the backs of the holes. … Insert 12-inch lengths of rebar into the holes, twisting them to ensure an even coating of epoxy around their circumferences and along their lengths within the holes.More items…
What can I use to glue concrete to concrete
SAKRETE Concrete Glue is a liquid latex bonding adhesive for bonding new concrete, mortar or gypsum plaster to existing surfaces. Ready to use and easy to apply, it eliminates the need for roughing or scoring old surfaces.
How do you glue something to concrete
Clean the concrete with a degreasing cleaner and a scrub brush. … Mix the two parts of the epoxy glue using a one-to-one ratio. … Roughen the surface of the second material with sandpaper to help it bond to the glue and concrete better.More items…
Should you put plastic under concrete
Recently, though, research has shown that the old traditional layer of 6-mil Visqueen (polyethylene plastic) under the slab is seldom effective for two main reasons: Although it may seem water-tight, this grade of material allows a lot of water vapor to pass through.
Can you join two pieces of concrete
How do you join two pieces of concrete together? Run a bead of concrete epoxy on the face of the edge of the first concrete slab, above and below the dowels. Cut your expansion joint material with a box cutter so you can press two strips onto the concrete (above and below the dowels) the entire length of the edge.
How long can you wait between concrete pours
seven daysConcrete professionals suggest waiting at least seven days after the crew is finished before parking or driving your personal vehicle(s) on your new concrete. The reason for this is because one week is the time period it takes for your new concrete to achieve 90% of its full potential strength.
What is the minimum thickness you can pour concrete
1.5 inchesThe minimum thickness for pouring concrete over concrete is 1.5 inches.
Can you bond epoxy to concrete
Today it is possible to bond any material, including concrete itself, firmly and permanently to a hardened concrete surface. Such bonding, using epoxy based “glues”, becomes as strong, and frequently stronger, than can be achieved by any mechanical means of connection.
Can you put a thin layer of concrete over concrete
Yes, you may pour a concrete pad overlay over an existing slab. You need to consider the added height and weight of the overlay on the existing structure. Overlays may include polymers, portland cement concrete, or epoxies. … You should improve the drainage of the slab by having a good slope on the overlay.
Can I glue concrete to concrete
QUIKRETE® Concrete Bonding Adhesive (No. 9902) permanently bonds new concrete, plaster, and stucco to existing concrete, plaster, and stucco. Eliminates the need for roughing the surface before the application.
Does hot glue stick to concrete
Reason #3: Hot melt leaves no damage to the elements or the concrete. Unlike screws and bolts, which leave ugly scars and holes, hot melt glue cools quickly, meaning that both your architectural/structural elements and your concrete remain undamaged throughout the bonding process.
How can I increase the height of my concrete floor
If you don’t want to go to the trouble of raising the height of the entire floor, you can apply floor leveling compound just to the area around the doorway. Apply the compound and feather it out with a trowel for several feet or more into the dining room.
How thick does a concrete overlay need to be
25 to 50 mmThe minimum recommended thickness is 1 to 2 in. (25 to 50 mm) for a fully bonded concrete overlay placed on a base slab that is practically free of cracks and in which the concrete is sound, clean, and of good quality. The use of welded wire fabric reinforcement is usually not warranted under these conditions.
How many bags of concrete do I need for a 10×20 slab
For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that’s an extra 8 60-pound bags or 6 80-pound bags.
Can you pour self leveling concrete over existing concrete
You can level an existing concrete floor with a leveling layer of new concrete, but you must prepare the old concrete floor first. Neglecting to prepare the old surface will prevent the new concrete from adhering correctly, resulting in a weak bond between the two layers.