الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Green geopolymer concrete (GGPC) which is capable for sustainable development is characterized by application of industrial wastes to decrease consumption of natural resources, energy and pollution of the environment. To reduce greenhouse gas emissions, efforts are needed to develop environmentally friendly construction materials. Using fly ash based geopolymer as an alternative binder can help reduce CO2 emission of concrete. The binder of geopolymer concrete is different from the ordinary Portland cement concrete in materials, and curing. Local steel slag (LSS) is produced as a by-product during the oxidation of steel pellets in an electric arc furnace. Using local steel slag waste as a substitute of crushed stone in construction materials would resolve the environmental problems caused by the large-scale depletion of the natural sources of crashed stone. The experimental study to investigate the influence of total replacement of crashed stone as a coarse aggregate with local steel slag, on fresh and hardened properties of cement and geopolymer concrete. The effect of sodium hydroxide dosage and sodium silicate dosage on the compressive strength of concrete and mortar specimens were investigated and the best results were used to design suitable mixtures of geopolymer mortar and concrete mixtures. The experimental test program was designed to achieve the research objectives of the study. The program consists of two parts; Part One: (in Concrete) Phase IP1 with cement content 350 kg/m3 consisting of two control mix (cement concrete mix); one mix containing crashed stone as a GEOPOLYMER CONCRETE ABSTRACT vii course aggregate, and anther control mix containing local steel slag as coarse aggregate. Nine mixes (in geopolymer concrete) containing crashed stone, sand, and fly ash as a 100% replacement of cement, with concentration of sodium hydroxide (Molarity) M10, M14 and M16, and using ratios of sodium hydroxide to sodium silicate by 1:1, 1:2 and 1:3 respectively. Three mixes (in geopolymer concrete) containing local Steel Slag as Coarse Aggregate, sand, and fly ash as a 100% replacement of cement, with concentration of sodium hydroxide (Molarity) M10, M14 and M16, and using ratio of sodium silicate to sodium hydroxide by 1:2. Phase IIP1 (in cement and geopolymer concrete) the above experiment is repeated with the same components but with different content of cement (for the cement concrete mixes), and fly ash (for the geopolymer concrete mixes), this content is 450 kg/m3 . Part Two: (in mortar) Phase IP2 cement mortar mix consisting of one control mix with cement to sand ratio of 1:3. Phase IIP2 in geopolymer mortar mixes consisting of nine mixes incorporating; six mixes containing fly ash to sand ratio of 1:3, with concentration of sodium hydroxide (Molarity) M10, M14 and M16, and using ratios of sodium hydroxide to sodium silicate by 1:1,1:2, and 1:3, respectively. three mixes containing metakaolin to sand ratio of 1:3, with concentration of sodium hydroxide (Molarity) M10, M14 and M16, and using ratio of sodium hydroxide to sodium silicate by 1:2. Phase IIIP2 (in cement and geopolymer mortar) consisting of Twenty mixtures (from the best mixtures of cement and geopolymer mortar) containing by pass Cement kiln dust (CKD) ratio of 5%, 10%, 15% and 20% as a partial replacement of cementitiues materials in cement and geopolymer mortar. In the process of mixing, the same procedures were followed for mixing all cement and geopolymer concrete mixes. It has been found that GEOPOLYMER CONCRETE ABSTRACT viii the compressive strength of geopolymer concrete with fly ash content 350 kg/m3 , and 450 kg/m3 and molarity M16 is about 28.9 %, and 12.2% more than the cement concrete with cement content 350 kg/m3 , and 450 kg/m3 , respectively. The obtained results indicate that the fly ash based geopolymer concrete can successfully be used for making structural pre cast concrete and non-structural concrete.