4. Cement composites

Different materials are used as additive to cement to improve the cement characterizations. The mechanical properties of the newly formulated composites were improved. Cement-waste fiber composite was produced due to the incorporation of waste fibers in cementitious materials and used in radioactive waste immobilization [6–9]. Polymers also were impregnated with cement to increase the durability and reduce the porosity of cement, producing favorable composite suitable for many applications and resistive to various aggressive conditions [10–15]. Natural additives such as clay were mixed progressively with cement to treat the retardation property of organic solvent with cement [16, 17].
