Commentary on Concrete
Cementitious materials have been used by civilizations over the past 5,000 years. The Egyptians used mud mixed with straw to bind dried bricks, and gypsum mortars and mortars of lime are evident in the pyramids. In the same period, 5,000 years ago, the Chinese used cementitious materials to bind bamboo in their boats and later rocks in portions of the Great Wall. These cementitious materials evolved with the advancement of science and technology to the concrete mixes of today. In the modern era, as in past civilizations, concrete is the single most widely used material in the world.