Cement was invented by the British Joseph Asperdin, and he also obtained the patent for Portland cement.
Cement: powdery hydraulic inorganic cementitious material. Add water and stir to form a slurry, which can harden in the air or in water, and can firmly bind sand, stone and other materials together.
The early mixture of lime and volcanic ash is very similar to modern lime pozzolana cement. Concrete made of cemented gravel with it is not only stronger after hardening, but also resistant to the erosion of fresh water or salt water.
For a long time, it has been used as an important cementing material and is widely used in civil construction, water conservancy, national defense and other projects.