AN EXPERIMENTAL AND NUMERICAL INVESTIGATION FOR COMPRESSIVE STRENGTH AND IMPACT OF ELEVATED TEMPERATURES ON CEMENT KILN DUST BASED GEOPOLYMER MORTAR IN PRESENCE OF CEMENT AND FLY ASH

Document Type : Original Article

Author

1 Civil Engineering Department, Faculty of Engineering, Qena Branch, Al-Azhar University, Qena, Egypt

2 High Institute for Engineering and Technology Al-Obour, Qalyobia, Egypt

Abstract

The study aims to verify the behavior of geopolymer mortar rich in cement kiln dust in addition to cement and Fly Ash under the influence of changing the molarity of sodium hydroxide and exposure to high temperatures that may reach 800 degrees Celsius and the effect of this on its compressive strength and weight loss. Numerical equations have been developed to  represent the relationship between the components of the mortar and its compressive strength in different conditions. Four groups, twelve mixes with 144 cubes had been casted for different mix ingredients.The results indicated that the compressive strength for geopolymer mixes ranges from (11.4:47.4 N/mm2), represent (31% - 130%)of the control mix .The reduction in compressive strength due to elevated temperature ranges from (32.2 : 5.2), which is less compared with the control by about (2% : 85%) . The percentages of Weight loss due to elevated temperatures ranged from (4%:20%) .The driven numerical equations had an R2 range from(0.726 : 1 ).  It was found very useful to use waste material as CKD instead of cement to decrease the bad impact on the environment and convert these wastes into useful products for sustainability. This study was conducted to recycle cement kiln dust with large amount to produce a green binder to eliminate cement production and consequently save raw materials and eliminate carbon dioxide emissions.

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