In 1824 an English inventor, Joseph Aspdin, burned and ground jointly a mixture of limestone and clay. This combination, called portland cement, has remained the dominant cementing agent Employed in concrete manufacturing. Cement molded into a forest of tubular constructions is often five.6 moments additional immune to cracking/failure than normal https://yourbookmarklist.com/story19947275/5-simple-statements-about-concrete-reinforced-stone-explained