allowing concrete to set is a chemical reaction where the Portland cement goes from a liquid slurry between the rocks and sand in the concrete (called aggregate) to a crystalline medium that bonds the aggregate together as an artificial mineral.
In addition to radically changing the physical properties of the concrete (from a runny goo to a solid surface) the process also gives off a significant amount of heat and isn't easily reversible.
Physical
Pouring tang into water is a chemical change. A change a said to be chemical if it changes color, taste, volume etc. Pouring tang into water causes a chemical change because the color changes and the volume of the tang changes because it is in a liquid state.
A physical change.
yes it is and pouring chocolate sauce in to milk to make chocolate milk is not a chemical reaction.
No it's not because all you are doing is melting the gold, putting in into a mold and letting it harden. It would be a chemical change if you added some other substance to it during the progress.
Pouring a concrete slab is the pouring of a fresh unset concrete mix into a prepared area, where it is finished by floating etc to give the required surface, and it sets to form a slab.
1-3 days for driveway or deck depending on thickness. For a pool you may need to water multiple times a day for 1-2 weeks
Temprature of concrete while pouring at site should be in the range 23 to 28 degree C.
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yes
concreting, concrete pouring, concreting casting.
chemical
Honeycombs in concrete are empty spaces that decrease the structural integrity of the concrete. These can be eliminated by rolling the concrete tight after pouring it.
It is possible to use a dirt wall when pouring concrete, but the liquid of the concrete will not make neat edges. The wall must be tamped firmly. This will work on shorter projects, but not on taller ones.
Yes you can. There is a special concrete formula made by sackrete that you just add water to the concrete after pouring it in a hole.
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chemical