In 1824 an English inventor, Joseph Aspdin, burned and ground together a combination of limestone and clay. This combination, referred to as portland cement, has remained the dominant cementing agent used in concrete production. Cement molded into a forest of tubular constructions may be 5.6 moments more immune to cracking/failure https://dantersrjf.daneblogger.com/34781623/concrete-reinforced-house-secrets