The manufacturing method of "Portland cement" described in his patent certificate is: "Mash limestone into fine powder, add a certain amount of clay, mix it with water, and stir it into slurry manually or mechanically. Put the mud on a plate and heat it to dry. The dry material is crushed into blocks, and then put into a lime kiln for calcination until the carbonic acid gas in limestone completely escapes. The calcined clinker is cooled, crushed and ground to make cement. When cement is used, a small amount of water is added and stirred into mortar with appropriate consistency, which can be applied to various workplaces. "
The color of this cement after hydration and hardening is similar to the color of building stone in Portland, England, so it is called "Portland cement".
But before that, people have found potential cohesive substances in natural substances such as volcanic ash, but this boy is the first person to apply for a certificate.