History of concrete development

In 1900, the World Expo showed the use of reinforced concrete in many aspects, which caused a revolution in the field of building materials. Inspired by the French engineer Anabec at the Paris Expo in 1867, after seeing the pots, tubs and water tanks made of wire mesh and concrete, he managed to apply this material to the building. In 1879, he began to manufacture reinforced concrete slabs, and later developed into a whole building using concrete structural beams reinforced with steel hoops and longitudinal bars.

Only a few years later, when he built the apartment building in Paris, he used reinforced concrete main columns, beams and slabs that have been improved so far. In 1884, the German construction company purchased Monier's patent and conducted the first batch of reinforced concrete scientific experiments to study the strength and fire resistance of reinforced concrete. The bond between steel and concrete. In 1887, the German engineer Coron first published the calculation method of reinforced concrete; the British Wilson applied for the patent of reinforced concrete slab; the American Heyt experimented on the concrete beam. From 1895 to 1900, France built the first bridges and sidewalks with reinforced concrete. In 1918 Abram published the famous water-cement ratio theory for calculating concrete strength. Reinforced concrete began to become an important material for changing the world landscape.

Concrete can be traced back to ancient times, and the cementitious materials used are clay, lime, gypsum, volcanic ash, and the like. Since the emergence of Portland cement in the 1920s, the concrete used in it has the strength and durability required for engineering, and the raw materials are easy to obtain, the cost is low, especially the energy consumption is low, so the use is extremely wide. (See inorganic cementitious materials).

At the beginning of the 20th century, some people published the theory of water-cement ratio, which laid the theoretical foundation for concrete strength. Later, light aggregate concrete, aerated concrete and other concrete appeared, and various concrete admixtures were also used. Since the 1960s, water-reducing agents have been widely used, and superplasticizers and corresponding fluid concrete have appeared. Polymer materials have entered the field of concrete materials, and polymer concrete has appeared; various fibers have been used to disperse fiber-reinforced concrete. . Modern testing techniques are also increasingly being applied to the study of concrete materials science.

Yellowing Resistance Test Chamber

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