In old China, "cement" refers to cement.
"Cement" and "cement" are the same thing.
In the old days of China, the industry was backward and many things were imported. It was customary to add the word "foreign" in front of these items. "Cement" is because there was no such thing in China at that time, and its color was like "gray", so it was called "cement" vividly.
History of Cement
In 1756, British engineer J. Smeaton discovered when studying the characteristics of certain limes hardening in water: To obtain hydraulic lime, cement containing clay must be used Limestone is used for firing; the ideal composition for masonry mortar used in underwater construction is composed of hydraulic lime and volcanic ash. This important discovery laid a theoretical foundation for the research and development of modern cement.
In 1796, the Englishman J. Parker fired a kind of cement from marl, which was brown in appearance, much like the mixture of lime and volcanic ash in ancient Rome, and named it Roman cement. Because it uses natural marl as raw material and is fired directly without ingredients, it is also called natural cement. It has good hydraulic hardness and quick-setting properties, and is especially suitable for projects in contact with water.
In 1813, French civil engineer Picasso discovered that cement made from a three-to-one mixture of lime and clay had the best properties.
In 1824, British construction worker Joseph Aspdin invented cement and patented Portland cement. He used limestone and clay as raw materials, mixed them in a certain proportion, calcined the clinker in a shaft kiln similar to burnt lime, and then ground it into cement. Because the color of the cement after hardening is similar to the stone used for construction in Portland, England, it was named Portland cement. It has excellent construction performance and is of epoch-making significance in the history of cement.
In 1907, Bière in France replaced clay with bauxite from aluminum ore, mixed with limestone and fired it to make cement. Because this cement contains a large amount of alumina, it is called "alumina cement".
In 1871, Japan began to build cement plants.
In 1877, Crampton in the UK invented the rotary kiln, and in 1885 it was reformed into a better rotary kiln by Lansam.
In 1889, near the Kaiping Coal Mine in Tangshan, Hebei, China, the Tangshan "Fine Cotton Soil" factory, which was produced using a shaft kiln, was established. In 1906, Qixin Cement Company was established on the basis of this factory, with an annual output of 40,000 tons of cement.
In 1893, Japanese duo Hideyuki Endo and Misada Utsumi invented Portland cement that was not afraid of seawater.
In the 20th century, while continuously improving the properties of Portland cement, people successfully developed a batch of cements suitable for special construction projects, such as high alumina cement, special cement, etc. There are more than 100 cement varieties around the world, and the annual cement output in 2007 was approximately 2 billion tons. China formulated the first national unified standard in 1952, which determined that cement production should be based on the principle of multiple varieties and multiple labels. Portland cement was renamed silicate cement according to its main mineral composition, and later renamed silicone cement. Salt salt cement to date.
In 2012, China's cement output reached 2.184 billion tons, accounting for more than 50% of the world's total output.
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