الفهرس 
one-part geopolymerOnly 14 pages are availabe for public view
 |  | from | 198 |  |  |
| | | from | 198 | | |
Abstract
Geopolymer or alkali activated aluminosilicate materials are categorized as ecofriendly cementitious materials with higher performance and resistivity against different aggressive media compared with Portland cement. Nevertheless, up till now the use of these materials in structural concrete making is limited. This is originated from fact that the corrosive nature of alkaline solutions which were used in the activation of the hydration of aluminosilicate materials. Therefore, the motivation behind this work is the enhancement the mass production and commercial viability of geopolymeric materials. This was conducted by the preparation of one-part alkali activated aluminosilicate materials which can react with water like Portland cement. New approaches including the preparation of inorganic and organic-based activator powders, thermochemical treatment of non-widely used demolition wastes, and thermal treatment of low kaolinite clay in the presence of NaOH were performed. The results proved that all the prepared one-part alkali activated cements has high efficacy to interact with water, yielding hardened materials with mechanical properties depending on the preparation strategy, dry activator type and content, and type of aluminosilicate materials. The main hydration products of the hydrated materials are calcium silicate hydrate, calcium aluminosilicate hydrate, hydrotalcite and sodium aluminum silicate hydrate. The type of aluminosilicate material also played an important role in the phases’ compositions as proved by x-ray diffraction, infrared spectroscopy, and differential thermal and thermogravemetric analyses. The microstructural development were followed by scanning electron microscopy. Finally, the thermochemical activation was found to have potential impact on valorizing the non-widely used demolition wastes (mainly concrete waste and red clay brick waste) in the production ready-mix alkali activated materials with outstanding properties. This also mainly contributes to the resolving the shortcoming regarding the low raw materials used in geopolymer synthesizes in Egypt.