الفهرس 
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Abstract
Concrete is a mixture of cement, sand, gravels and water. Some Additives and admixtures are also sometimes added to achieve some new properties. In this research, the properties of cement mortar containing Homra, slag of steel and modified with Nano-silica (NS) will be studied. Ground clay bricks (GCB) or Homra and slag of steel (S) are solid wastes industrial material. They are mainly consist of silica quartz, aluminosilicates, anhydrite, and hematite. Therefore, they act as good pozzolanic materials. Recently nanotechnology has attracted a considerable scientific interest, due to the new potential uses of particles in Nano scale, which can change the concrete world. Nano-materials (NMs) improve the concrete characteristics. Nano-particles (NPs) showed unique physico-mechanical and chemical properties different from those of the conventional materials.