2, binding, welding, mechanical connection
3. Absolute density, mass
4. altitude
Reinforced concrete (English: reinforced concrete or reinforced concrete) is often called reinforced concrete in engineering. It refers to adding composite materials composed of steel bars, steel plates or fibers into concrete to work together with it to improve the mechanical properties of concrete. This is the most common form of reinforced concrete.
The invention of reinforced concrete appeared in modern times. It is generally believed that the French gardener en:Joseph Monier invented reinforced concrete in 1849, and obtained the patent of reinforced concrete flowerpot and reinforced concrete beam and column applied to highway guardrail in 1867. 1872, the world's first reinforced concrete structure was completed in new york, USA, and a brand-new era in the history of human architecture began. After 1900, reinforced concrete structures were widely used in engineering. 1928, a new reinforced concrete structure, prestressed reinforced concrete, appeared and was widely used in engineering practice after World War II. /kloc-the invention of reinforced concrete and the application of steel in the construction industry in the middle of the 0/9th century made it possible to build high-rise buildings and long-span bridges.
At present, reinforced concrete is the most widely used structural form in China, accounting for the vast majority of the total, and it is also the most widely used area of reinforced concrete structures in the world. Its main raw material cement output has reached18.82 million tons in 20 10, accounting for about 70% of the world's total output.