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Abstract
The Investigation of cementations composites incorporating nano materials such as, nano silica (NS), nano titanium (NT), and carbon nano tube (CNT) on the different cement paste / mortar / concrete characteristics is the main purpose of this thesis. The cement paste incorporating NS, takes an important role in generating C- S- H. A 6% replacement achieves the best proportion where increasing both compression and flexure strengths by 42% and 50% respectively, while hydration process increases up to 16% as well. A 1% CNT cement replacement in mortar achieves mechanical characteristics improvement by about 27% in compression and 6% in flexure, while porosity is improved by 30%. A 0.04% CNT cement replacement in concrete achieves 42% improvement in compression under normal condition, and 36% in indirect tensile strength under normal and fire conditions respectively. Furthermore, numerical analysis using (ABAQUS) is conducted to study the strengthening effect of cracked concrete beam using epoxy resin incorporating CNT