الفهرس 
Chapter (1) IntroductionOnly 14 pages are availabe for public view
 |  | from | 168 |  |  |
| | | from | 168 | | |
Abstract
1:- Introduction: - Geopolymer concrete is an environmentally friendly alternative to Portland cement, reducing carbon dioxide emissions. It is made from waste materials like fly ash and granulated blast furnace slag and requires an alkaline activator solution as a catalytic fluid system. Water plays a crucial role in the resistance and properties of geopolymer concrete, as it can negatively affect its resistance when containing impurities, leading to iron rust. Research has focused on the suitability of water used in mixing or processing. The idea of using water exposed to a magnetic field in concrete has been proposed, as the cost of magnetically treated water is low compared to other methods. Magnetic energy affects water due to its structure, causing hydrogen bonds to change or break, increasing susceptibility to electrolysis, and affecting crystal dissolution. The effect of magnetized water on geopolymer concrete’s mechanical properties is being studied, comparing it with tap water. 2:- Research scope: - The effects of MW on the mechanical properties of geopolymer concrete were investigated and the mechanical properties of geopolymer concrete were studied. Magnetized water was prepared and its physical and chemical properties were measured after magnetization. The mechanical properties measured were concrete workability, compressive strength, tensile and splitting strength, flexural strength, and pullout strength. Nondestructive testing and microstructure analysis were also carried out on the prepared mixes. 3:- Research objective: - The main objective of the study is to investigate the effect of magnetized water on the mechanical properties of geopolymer concrete by exposing the mixing water and the active alkaline solution used in the production of concrete to magnetic fields The effect of these fields on some of the properties of the concrete and comparing the results with those of the reference mix. Geopolymer concrete is studied and examined using tests such as slump test, compressive strength, splitting tensile strength tensile strength, flexural strength, pull-out strength, SEM, EDX, and XRD. Furthermore, the study evaluates the Physicochemical properties of water parameters, such as water temperature and pH Total dissolved solids (TDS), electrical conductivity (EC), surface tension (ST), and water density. The difference between MW and TW was also studied in the alkaline solution used in the preparation of geopolymer concrete. This is to evaluate the replacement of conventional concrete with more sustainable and environmentally friendly advanced materials. The research process is presented in the supplementary material. 4:- Steps Study: - The thesis is organized into Five chapters. Chapter 1 describes an overview and significance of the research, as well as the objectives and contents of the thesis. Chapter 2 reviews previous studies and literature on magnetized water (MW)
and its usefulness in various sectors, particularly building, and its impact on concrete and its qualities. It also provides an outline of geopolymer concrete (GP) and recent breakthroughs in the field. Chapter 3 reports on the properties of the materials utilized, in addition to a description of the experimental testing of samples and tests performed. Chapter 4 presents results, Discussions, comments, and analyses on major issues concerning the mechanical properties of geopolymer concrete, in addition to statistical models. Chapter 5 presents the general conclusions, recommendations, observations, and suggestions of this thesis. 5:- Summary of Study:- The study explores the use of magnetized water (MW) in creating fly ash (FA) and silica fume (SF)-based geopolymer concrete. MW was prepared by passing tap water through two permanent magnetic fields from (1.6 T to 1.4 T). The water was subjected to 150 cycles of a permanent MF as well as intensity fields of 1.6 T and 1.4 T in series, going from a 1.6 T device to a 1.4 T device. Alkaline activators were Sodium hydroxide, potassium hydroxide, and sodium silicate. 28 geopolymer concrete mixes were produced and tested, with half using MW and the other half using TW. Variables like water type, SF content, Alkaline activator type, concentration, AA/C ratio, and water-to-cementitious materials were considered. The study measured the physical and chemical properties of the water and AA, as well as the concrete’s mechanical properties. Slump test, compressive strength, SEM, EDX, and XRD were used to assess the concrete properties. MW in Geopolymer Concrete Preparation Increases concrete slump by 14%. Increases compressive strength by up to 64%.Increases tensile strength by up to 60%.Enhances flexural strength by up to 41%.Increases bond strength by up to 40%.Decreases water absorption by up to 38%. Increasing the SF content above 20% resulted in a significant reduction in compressive, tensile, and flexural strengths. At 100% silica fume content the concrete slump increased by 108% but adversely affected the cohesion of the concrete. The effect of MW on the SH solution particles was more favorable than PH increase in the AA/C ratio can increase slump by up to 17% but decrease compressive strength by 23% at 28 days. The UPV test with MW showed higher pulse velocities than those with TW but the test led to inaccurate predictions that need to be investigated. The microstructural analyses (SEM, EDX, and XRD) observed that A denser and more homogeneous matrix with fewer holes with fly ash and MW. and the sample with MW and silica fume successfully overcame the high temperature generated by the silica during the reaction.