Ready Mix Concrete

The time period during which concrete was first invented depends on how one interprets the term “concrete.” Ancient materials were crude cements made by crushing and burning gypsum or limestone. Lime also refers to crushed, burned limestone. When sand and water were added to these cements, they became mortar, which was a plaster-like material used to adhere stones to each other. Over thousands of years, these materials were improved upon, combined with other materials and, ultimately, morphed into modern concrete.Today’s concrete is made using Portland cement, coarse and fine aggregates of stone and sand, and water.

Admixtures are chemicals added to the concrete mix to control its setting properties and are used primarily whenplacing concrete during environmental extremes, such as high or low temperatures, windy conditions, etc.The precursor to concrete was invented in about 1300 BC when Middle Eastern builders found that when they coated the outsides of their pounded-clay fortresses and home walls with a thin, damp coating of burned limestone,it reacted chemically with gases in the air to form a hard, protective surface.

This wasn’t concrete, but it was the beginning of the development of cement.Early cementicious composite materials typically included mortar-crushed, burned limestone, sand and water, which was used for building with stone, as opposed to casting the material in a mold, which is essentially howmodern concrete is used, with the mold being the concrete forms.