الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Geopolymer is considered as one of the green materials where, it reduces CO2 emission up to 80-90%[1].It has many unique properties such as low shrinkage, acid, and fire resistant[2]. It has also an ability to immobilize radioactive materials[3]. Using geopolymer as protective coating materials may be an alternative as green inorganic polymers that may be used efficiency as a concrete surface protection, and as a protective coating for different surfaces including metal [4]due to their superior mechanical, chemical and thermal resistance properties[5].The geopolymer coating has valuable uses in industrial applications where it offers an innovative, sustainable solution for maintaining infrastructure in a manner that enhances public image and safety while reducing greenhouse emissions. In this study, fly ash based geopolymer mortar was designed to overcome many of its adversely properties such as adhesion properties and retarding of setting time that may be hinder its application as surface coating materials. Many of different mineral materials can be added such as lime, cement, slag, and silica fume to improve these adversely properties. characterization of different fly ash mortar has been evaluated by measuring physical properties such as setting time, absorption, and microstructure.While the efficiency of using these materials as a concrete surface coating has been evaluated by measuring water permeability, adhesion pull off, carbonation resistance and corrosion resistance properties of thin layer of fly ash geopolymer coating. In this research, different percentage from 7.5% up to 15% of mineral materials was studied to investigate the optimum content of these materials which give a superior property of fly ash geopolymer mortar. Many factors which have a great effect of fly ash geopolymer properties such as curing temperature, ratio between sodium silicate and sodium hydroxide in activator solution were studied. This research was divided into three parts; firstly,fourty three mixtures were preapered to study the fresh fly ash geopolymer mortar; consistency, and setting properties and physical properties such as water absorption are studied. Secondary, hardened properties of geopolymer mortar; compressive strength and its microstructure characterization “scanning electron microscopic analysis SEM are also determined.The third part؛ included the application of using new composition of fly ash geopolymer mortar as a surface coating material , surface coating of concrete surfaces or as an anticorrosive materials on steel reinforced bars. Water permeability and carbonation resistance were used to evaluate the performance of fly ash geopolymer mortar as a concrete surface coating material. While the polarization of resistance of coated steel bars was utilized to assess its corrosion resistance behavior. The test results showed that fly ash geopolymer coating with high molarity and silica fume addition has a superior performance to decrease the water penetration depth and improves the adhesion properties between the coating material and concrete surface. Also, adding silica fume reduce the carbonation depth compared to that of commercial coating material. VI The study also showed that, generally, fly ash geopolymer mortar with different binder types such as slag and silica fume improves fly ash geopolymer mortar as a green surface coating for metals. where FA-10SF and FA-7.5GS have lowest corrosion rate for metals.