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Yes. Water is actually needed for concrete to set and is vital to the curing process. Concrete will set just fine under water. Depending on your specific application (will all of the pour be under water or will it start under water and finish above the water line) you may need to adjust the initial dryness of the mix as well as take more care in the pour. All of the volume of the concrete that is under water shoudl be poured in continuous fashtion. If you must pour in steps, the start of the next pour must be "in" the old pour so as to not leave a water survice between the pours. This "seam" will tend to stay and produce a weaker stucture.
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What is Damp proof membrane under concrete slab?
This is a heavy gauge polythene laid under the concrete to stop dampness rising upwards
Why does concrete mix with low water cement ratio resulted in hardened concrete having higher strength than those with high water cement ratio?
Why does concrete mix with low water cement ratio resulted in hardened concrete having higher strength than those with high water cement ratio?
How would you describe the process of concrete setting?
Concrete setting is initiated by a process called hydration. Rather than the concrete just 'drying out', the hydration process involves the water added to the materials (stone, sand & cement) reacting with the cement. The water reacts with calcium in the cement to form an alkali paste which bonds the materials together. Adding too little water means not enough cement hydrates to set properly, but too much will cause separation of the materials.
What is the best method to prevent tile debonding?
This answer pertains to tile set on a concrete substrate! Assuming your thin-set is properly mixed with correct water ratio, the substrate is free of any bond breakers, and it is troweled for the type of tile your using, the most common problem is moisture coming up through the slab collecting at the tile/substrate interface. If you are in a humid climate the HVAC will pull moisture out of a concrete into the less humid interior. Water breaks down the thin-set bond to the tile and emulsifies other mastic's/glues intended to secure a VCT product. The best way to prevent moisture from wicking through a slab is to waterproof the concrete substrate with a product that will will stop this moisture transfer. It will also prevent the alkali in a concrete from coming out to a surface where it reacts with an atmosphere. Alkali burn causes a paint to bubble, peel and blister off a concrete. With a waterproofed concrete this alkali does not migrate out and form efflorescence salts. When you stabilize concrete, contaminates don't enter and moisture doesn't travel to a surface.
What is concrete house?
a concrete house is a house that is made out of water,cement,sand & sometimes small rocks
What is used to set concrete?
Water
Can you plant a seed in concrete?
You can but it will not grow. it will if theres water under the concrete
How does concrete set?
It dries, the water or liquid in it evaporates
How couldi design an under ground concrete water tank?
pleas i want to know the proccedure of deisign of under ground concrete water tank
Should you use salt water to mix concrete?
Mixing salt water with concrete is not advised. The concrete will not set up properly and will crumble very easily.
Water leak problem under the sidewalk, how do I get to it without breaking the concrete?
I have a water leak under slab concrete and it is coming off the walk into my yard. How do I get to it to fix it without breaking the sidewalk?
Is wet concrete heavier then dry concrete?
Concrete is made of a mixture of cement, aggregate (small stones), fine aggregate (sand), water and other chemical additives. When mixed the wet concrete will remain so for Most people assume that set concrete has no water in it, this is not so, as the water content helps bond the aggregates and cement, this process is known as Hydration. Concrete with no water in it would crumble to dust. Adding more water to the mix will make a concrete that is easier to work, while less water will produce a stronger, more durable concrete. After initial setting of the concrete, a slow amount of water loss is expected due to the concrete drying, it can take anything up to a year for water to stop evaporating slowly out of the concrete. So for this reason the answer to your question is yes, dry, set concrete will weigh less than wet concrete, but for anything up to a year it will keep getting lighter, due to waterloss.
Why does a flash set happen in concrete?
the loss of water due to extra heat and air temp
Is unset concrete heaver than set concrete?
No, not relly. You might get a bit of water evaporation but generaly 1 cubic meter of concrete is about 2.2 tons, wet or dry. Regards Colin
How do you put concrete on concrete and make it stick?
you need to have a ''keyway''---that is a groove in the base concrete,can be cut in if concrete has set,if not set,oil a 2x4lightly(lightly) & imbed it into the base concrete flush.
Why can concrete cure underwater?
Yes it can. It actually cures harder under water then above it. True.
Will homeowner's insurance cover the repair of a broken water pipe under a concrete driveway?
dependent
