Anonymous ID: 33a586 Feb. 5, 2019, 11:37 a.m. No.5039150   🗄️.is 🔗kun

>>5039141

https://en.wikipedia.org/wiki/Roman_concrete

By the middle of the 1st century, the material was used frequently, often brick-faced, although variations in aggregate allowed different arrangements of materials. Further innovative developments in the material, called the Concrete Revolution, contributed to structurally complicated forms, such as the Pantheon dome, the world's largest and oldest unreinforced concrete dome.