Study the Effect of Calcium and Nano Al_2O_3 Oxide Powders on the Mechanical and Physical Properties of Cement Mortar

摘要

The concrete is the major construction materials, the concrete have impact on environment because the production of concrete composition material (cement, sand, and coarse aggregate) lead to depleted natural resources and emitted CO_2 .Therefore; in this study two types of eggshell is prepared, three different percentages of eggshell (2.5, 5, and 10%) and 1% nano-materials(nano-Al_(2O3)) are added to partial replace of cement weight in the cement mortar to reduce the cement environment impact and their effect on the mechanical (compressive strength) and physical (density, and water absorption) properties are investigated. The results shows when add the eggshell to the cement mortar the compressive strength are increased up to 5% of eggshell then decreased, while the density, and water absorption of cement mortar are decremented with addition 2.5% of eggshell. The combine effect of nano-Al_2O_3, eggshell powder and nano-Al_2O_3, calcined eggshell powder are decreased the compressive and density, while the absorption percentage is increased compared with nano Al_2O_3 cement mortar (NA).