In 1824 an English inventor, Joseph Aspdin, burned and ground jointly a combination of limestone and clay. This combination, known as portland cement, has remained the dominant cementing agent Employed in concrete production. Ornamental plate made from Nano concrete with High-Electricity Mixing (HEM) Nanoconcrete (also spelled "nano concrete"' or "nano-concrete") https://emilianoqxxxw.collectblogs.com/80531760/concrete-reinforced-wall-an-overview