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Concrete has Portland cement in it. Portland cement is finely ground limestone that is baked until there is no water in it at all.
After concrete is poured, the water in it starts chemically combining with the Portland cement, slowly turning it back into limestone . . . sort of. After 3 days, the concrete is hard enough to use . . . walking on or driving on with a light car, but it takes 28 days for concrete to harden to its full rated strength so it is usable in building, bridges, and so on.
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∙ 13y ago
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Why cement can set hard?
Thw AIR set the cement hard I found this out on my text book LOL
What is a good sentence for cement?
the strong apartment building was made of hard cement
What happens if you eat hard cement?
yes it goes extremely hard
Why do you fill volcano with cement?
they put cement because i very hard the streets are made out of cement and u can brake it and the magma would not come out
Does roofing cement dry hard and how long does it take to dry?
how long does roof cement to dry
What can you take to get hard before you see your girlfriend?
Cement
Why does cement harden?
cement is a calcined mixture of limestone,silica and gypsum that are anhydrated and form a hard structural bond on drying
What would life be like if you didn't have cement?
Life without cement will be hard because nothing will be made.also because cement holds things together if something is made it will calmphs
What is waterproof cement?
Waterproof cement is cement that is waterproof. It can be applied to a surface without being affected if it was touched by water.
Can you mix cement in the hole you dug?
Yes, but the walls of the hole may contaminate the cement. Mixing the cement may be very hard, and precarious. Further, you may not be able to remove all the cement from the hold afterwards. It is more advisable to use a cement-mixer.
Why cement became hard when it came in contact of water?
because water falls on it
What are houses made from in India?
mostly metal and hard rock and cement
