الفهرس 
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Abstract
This thesis considers the production of cement resistant to water permeability. The importance of using this cement is to reduce the water permeability of concrete hence it decrease the danger of corrosion consequently increasing the durability of concrete and the age of the buildings.
To achieve this goal the experimental program was designed to include the following. factors:
1- Cement type (OPC ordinary Portland cement, S.C slag cement, and SRPC sulfate resistant Portland cement).
2- cement content (250,350 and 450) kg/m3.
3- Additive type where alum, gypsum and combination of them have been used.
To study the effect of these factors on the mechanical properties of the mortar, 27 mixes of mortar with additives and 9 control mixes were done. A complete factorial method of the experimentation was used for the organization of the tests and analysis of the results.
To check the significance of each treatment factor the analysis of variance [ANOY A] table was performed on the results obtained .The main advantages of this method are it measures the interaction between factors which cannot be achieved by classical method of experimentation and it provides a statistically mathematical approach for the analysis of results at a latter stage.
The performance of these mixes has been studied for mechanical properties (compressive strength), durability test (initial surface absorption test ISA T) and corrosion test.
To determine the best concentration of additives many trails was made using alum at (0.1, 0.3, 0.5, 1, 2)%of cement weight, gypsum (I, 2.5, 5, 10)% of cement weight and mixes from both of them. It was found that the best concentration for alum and gypsum were 0.5% and 5% of cement weight