Yes – good word!
Reinforced concrete was once called “liquid stone.” It is made of a combination of three main ingredients: 65% aggregates such as sand, gravel, crushed rock, recycled glass; 10-15% cement (calcium silicates and aluminates); and 15-20% water: and was invented in 1867 by Joseph Monier. The word “concrete” is derived from the Latin concretus that means, “grow together.” The crushed stone and gravel are mixed with the cement and water. And as the water hydrates the cement, the silicates grow and crystalize binding the strong rock powder, making it stronger than it was in the first state. By continuing to wet the mixture the binders grow further, strengthening the mass still more.
Interesting, the crystals are not crystalline as such, rather a more random structure (much like glass) that traps air pockets. In this way, this super strong concrete mass is also flexible. By adding twisted strands of steel—reinforcing bar, or…
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