The invention of ordinary portland cement is 1824, and that of reinforced concrete is 1848.
-excerpt: 1796, Englishman J. Parker burned a kind of cement with marl, which was brown in appearance, much like the 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, British construction worker J. asp Ding obtained the patent right of portland cement.
He used limestone and clay as raw materials, mixed them in a certain proportion, calcined the mature materials in a vertical kiln similar to lime burning, and then made cement by grinding.
Because the color of hardened cement is similar to the stone used in construction in Portland, England, it is named Portland cement.
It has outstanding architectural performance and epoch-making significance in the history of cement.