When was cement invented? When was cement invented and applied?

1756, British engineer J. Smeaton found that in order to obtain hydraulic lime, limestone containing clay must be used for firing; The ideal composition of masonry mortar for underwater structures is made of hydraulic lime and volcanic ash. This important discovery laid a theoretical foundation for the research and development of modern cement.

1796, an Englishman J. Parker burned a kind of cement with marl, which was brown in appearance, much like a mixture of lime and volcanic ash in ancient Rome, and named it Roman cement. It is also called natural cement because it is made of natural marl and contains no ingredients. It has good hydraulic and rapid setting characteristics, and is especially suitable for projects in contact with water.

In 18 13, Gaby, a French civil engineer, found that the cement made by mixing lime and clay in a ratio of three to one has the best performance.

1824, Joseph Astin, a British stonemason, obtained a patent for the cement he invented in the kitchen. He mixed limestone and calcareous soil in the kitchen stove, heated them and ground them into powder, making cement that would harden after adding water. Aspdin named cement Portland because it looks like a stone from Portland Island, a British coast.

References:

Baidu baike