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A cement is a binder, a substance that sets and hardens independently, and can bind other materials together. it was made from crushed rock with burnt lime as binder. Cement (as in Portland type cements) is made by heating limestone to 1450 degrees C, then grinding the result into fine powder and adding a small amount of clay. When mixed with sand, stones, or other aggregates, the result is concrete. Cement hardens by hydration, absorption of water, and not by drying. Chemical Formula for cement i think its 3CaO SiO2 Go to this link... this may help you to find you a better answer elearning.vtu.ac.in/Programme%2016/ENotes/ConcreteTechnology/Unit1-RVR/Unit1-L2-RVR.pdf