What is concrete? Detailed answer

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What is concrete? Detailed answer

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What is concrete?

Concrete is one of the most important and necessary building materials ever created by man. It is strong, durable, rather cheap and easy to manufacture and use material. It does not collapse either from fire, or from water, or from bad weather, or from heavy loads. Huge dams, bridges, skyscrapers, highways, houses, runways for airplanes - all this is made of concrete.

Concrete is made from Portland cement, water, sand, gravel or crushed stone. These materials are mixed in the right proportion - and concrete is obtained. Prepared concrete can be given almost any shape by pouring it into special forms called formwork. When mixed, water and cement form a kind of paste that envelops the sand and gravel. When the paste hardens, it turns into a solid, like a stone, mass.

From time to time, moistening the concrete poured into the mold can make it even harder, because due to the chemical reaction between cement and water, the concrete hardens more and more over time. Concrete is used in different ways, depending on the specific purpose for which it is intended. For example, concrete applied in a thin layer is brittle and breaks quickly. To achieve the strength of concrete structures to loads, concrete is applied to steel bars or mesh. Such concrete is called reinforced concrete.

Another way to strengthen concrete products is that it is poured onto a pre-tensioned springy steel mesh. Such concrete is called stressed.

Now they make concrete, containing billions of small air bubbles in every cubic centimeter. Such concrete is called cellular. Road surfaces are made from it, which are not affected by either frost or thaw.

So, as you can see, there are many ways to improve concrete and make it suitable for special building needs.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why did Marvel create a new hearing aid-wearing superhero?

Marvel employees have received a letter asking for help from the mother of 4-year-old boy Anthony Smith. The child was almost completely deaf, and he needed to wear a hearing aid, but he refused to do this, since superheroes do not use such devices. Marvel immediately remembered one of the Hawkeye comics when he was forced to wear a hearing aid due to an injury. The artists created the special, pairing Hawkeye with a new The Blue Ear character inspired by Anthony, who said, "With my machine, I can hear calls for help from anyone in need!" Having received these drawings as a gift from Marvel, the boy began to put on the device with pleasure.

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