الفهرس 
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Abstract
Buildings mortar is considered an important element in the majority of masonry work as it has a direct effect on the masonry structureś behavior and cost. This research studies the possibilities of using different types of cement and replacing part of the used cement with lime powder and CKD (Cement Kiln Dust). Experimental program was divided into two phases; phase one includes different types of cement (CEMI 42.5N, CEM II B-L 32.5N and CEM II A-S 42.5N) with different replacement ratios namely (0, 10, 15, 25%) of each cement type by lime and CKD, For each mortar mix compressive strength at 2&28 days were demonstrated and the flowability was kept constant. Phase two includes testing of 18 clay brick prisms and 6 masonry walls with replacement percentage of 25%of the cement content in compression. The experimental results of phase one proved the availability of using CEMII A-S 42.5N or CEMII B-L 32.5N instead of CEMI42.5N in masonry mortar mixes and also it can be demonstrated that use of lime and CKD as cement replacement of masonry mortar achieved good cracking behavior and mode of failure with respect to reduction of 25% of cement of control specimen cement content. Also, the compressive strength, initial stiffness and toughness of the wall were relatively accepted if compared with the control walls (100% CEMI42.5N). It was found that the use of CEMII B-L 32.5N instead of CEMI42.5N reduced only 4% of the compressive strength of the tested wall compared to that of 100% CEMI42.5N.