What is cement and its history?

Cement, the gray and fine powder, is the most used construction material on the world. However, how many people do they know what cement is? the answer for this question from Wikipedia is as follows,

In the most general sense of the word, a cement is a binder, a substance that sets and hardens ind......

Factors affecting the reactivity of slag

The exact composition of slag varies over a range. In general, factors that determine the suitability of slag for usage in composite cement mainly include the fineness of grinding, glass content and the chemical composition.

Fineness

Like most of other cement materials, the reactivity of slag is......