Concrete is a construction material consisting of cement (usually Portland cement), sand, stones as well as water. The mixing ratio is expressed as weight proportions of first three concrete color pigment ingredients. The amount of water is used to adjust the volume - less water results in higher binding strength. As a building material it excels by being malleable during molding, having high compressive strength after curing and good weather resistance.
The great progress in the scientific study of the behavior of reinforced concretes and technological advances enabled the construction of large dams and tall skyscrapers. Its role is now irreplaceable in public buildings, including stadiums, theaters, cinemas, etc. Many nations and cities compete to erect a larger building that is more beautiful, as a symbol of progress that normally will be made of reinforced slabs.
There are no signs of its use found until the thirteenth century, when it was reused in the foundation of Salisbury Cathedral and the famous Tower of London, England. During the Renaissance, its use was low and not significant. In some cities, large structures built by Mayans and Aztecs in Mexico or Machu Pichu in Peru used cement.
In the eighteenth century, with the desire to revive the investigation, John Smeaton, an engineer from Leeds was commissioned to build a lighthouse on the cliff Edystone, on the coast of Cornwall, using stones together with lime mortar calcined to form a monolithic building. The structure supported the constant wave action and the moist winds and was completed in 1759 and yet the foundation still remains.
The slab is a composite material used in construction, consisting essentially of a binder to particles or fragments of an aggregate, water and specific additives. The binder is in most cases the cement mixed with a suitable proportion of water for a hydration reaction to occur. Aggregate particles, depending on their average diameter, are aggregates. The single mix of cement (is composed of sand and water.
The hemispherical dome, which is 43.44 m in diameter has resisted reforms for nineteen centuries without reinforcements. The bulk murario ring is brick and tile works (concrete bricks) and dome lightened using pumice as aggregate. In ancient Greece, around 500 BC. C., they mixed compounds calcined limestone with water and sand, adding crushed stones, broken tiles or bricks, creating the first concretes history, using tuff taken from the island of Santorini.
It hardens in a few hours turning to a stone material. The cement consists essentially of hydrated calcium silicate (SCH), this compound is mainly responsible for its adhesive properties. It is called hydraulic cement when it is formed from hydration, it is stable under aqueous environment. In addition, you can modify some of its characteristics or behavior by adding additives (in amounts less than 1 percent of the total mass).
Among them, the most important is the nuclear reactor that collapsed in the Chernobyl plant, which was covered with concrete to prevent radiation leaks. Concrete is the material resulting aggregates unite with paste obtained by adding water to a conglomerante. The binder can be any, but when we refer to concrete, usually is an artificial cement, and between them, the most important. Aggregates come from the disintegration or grinding, natural or artificial rocks and, according to the nature thereof, are called siliceous aggregates, limestone, granite, etc. The aggregate whose size is greater than 5 mm is called coarse or gravel, whereas less than 5 mm is called arena.
The great progress in the scientific study of the behavior of reinforced concretes and technological advances enabled the construction of large dams and tall skyscrapers. Its role is now irreplaceable in public buildings, including stadiums, theaters, cinemas, etc. Many nations and cities compete to erect a larger building that is more beautiful, as a symbol of progress that normally will be made of reinforced slabs.
There are no signs of its use found until the thirteenth century, when it was reused in the foundation of Salisbury Cathedral and the famous Tower of London, England. During the Renaissance, its use was low and not significant. In some cities, large structures built by Mayans and Aztecs in Mexico or Machu Pichu in Peru used cement.
In the eighteenth century, with the desire to revive the investigation, John Smeaton, an engineer from Leeds was commissioned to build a lighthouse on the cliff Edystone, on the coast of Cornwall, using stones together with lime mortar calcined to form a monolithic building. The structure supported the constant wave action and the moist winds and was completed in 1759 and yet the foundation still remains.
The slab is a composite material used in construction, consisting essentially of a binder to particles or fragments of an aggregate, water and specific additives. The binder is in most cases the cement mixed with a suitable proportion of water for a hydration reaction to occur. Aggregate particles, depending on their average diameter, are aggregates. The single mix of cement (is composed of sand and water.
The hemispherical dome, which is 43.44 m in diameter has resisted reforms for nineteen centuries without reinforcements. The bulk murario ring is brick and tile works (concrete bricks) and dome lightened using pumice as aggregate. In ancient Greece, around 500 BC. C., they mixed compounds calcined limestone with water and sand, adding crushed stones, broken tiles or bricks, creating the first concretes history, using tuff taken from the island of Santorini.
It hardens in a few hours turning to a stone material. The cement consists essentially of hydrated calcium silicate (SCH), this compound is mainly responsible for its adhesive properties. It is called hydraulic cement when it is formed from hydration, it is stable under aqueous environment. In addition, you can modify some of its characteristics or behavior by adding additives (in amounts less than 1 percent of the total mass).
Among them, the most important is the nuclear reactor that collapsed in the Chernobyl plant, which was covered with concrete to prevent radiation leaks. Concrete is the material resulting aggregates unite with paste obtained by adding water to a conglomerante. The binder can be any, but when we refer to concrete, usually is an artificial cement, and between them, the most important. Aggregates come from the disintegration or grinding, natural or artificial rocks and, according to the nature thereof, are called siliceous aggregates, limestone, granite, etc. The aggregate whose size is greater than 5 mm is called coarse or gravel, whereas less than 5 mm is called arena.
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