Ready Mix Concrete is concrete that is made in a batch factory, following a pre-engineered concrete mix design. The term, ready mix, describes the production of concrete. Ready-Mix Concrete normally comes in two different methods. One method delivers concrete by pressurized means, which may include high-pressure or ultra-high-pressure. The other method delivers concrete by gravity with no pressurization. A standard batch of ready-mix concrete contains eighty-five percent aggregates, fifteen percent cement coarse aggregate, five percent filler materials, five-percent water-resistant aggregates, and three percent sand.