الفهرس 
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Abstract
Concrete is the world’s most versatile, durable and reliable construction material. Next to water, concrete is the most used material, which required large quantities of Portland cement. Ordinary Portland cement production is the second only to as the major generator of carbon dioxide, which polluted the atmosphere. In addition to that large amount energy was also consumed for the cement production. Hence, it is inevitable to find an alternative material to the existing most expensive, most resource consuming Portland cement. Geopolymer concrete is an innovative construction material which shall be produced by the chemical action of inorganic molecules, silica fume, red mud and etc. As replacement of ordinary Portland cement (OPC) in making concrete has definitely provided us a chance to lor carbon footprints, referred to as geopolymer concrete.
In this research, improvement and investigation of the properties of fresh geopolymer concrete based ground granulated blast furnace slag (workability, setting time, bleeding, evaporation rate, plastic shrinkage cracking, internal temperature) and some hardened concrete properties (compressive strength, tensile strength), investigated experimentally. Also, the effect of various types and dosages of admixtures on properties of fresh geopolymer concrete was investigated experimentally. polypropylene fibers re added individually to a concrete mix at a certain dosage, which is a percentage of concrete volume. The results were evaluated, interpreted, and the compatibility of tests conducted on conventional concrete with geopolymer concrete was investigated.
The results obtained re compared to those found in the literature. In this study, the molar ratio has a significant effect on the workability of concrete. The additive used is incompatible with geopolymer concrete and has no effect on improving workability. When only sodium hydroxide is used as an alkaline solution, it reduces workability, leading to a decrease in the absence of cracks on the surface of the concrete at the beginning of its life, its color tends to dark green, due to the weakness of the polymerization process at the beginning of the concrete life. The polypropylene fibers reduce the workability, reduces the width, length and quantity of plastic shrinkage cracks, improves the compressive strength and tensile strength, reduces the width, and delays the final setting time.
The standard test of plastic shrinkage cracking is incompatible with geopolymer concrete, because cracks in this test are supposed to occur above the stress riser for conventional concrete, but with geopolymer concrete, cracks spread in a scattered manner, which makes the test incompatible and may need to be modified to match the geopolymer concrete. The bleeding test is not compatible with geopolymer concrete, because the amount of bleeding water that appears on the concrete surface is almost non-existent.