الفهرس | Only 14 pages are availabe for public view |
Abstract Geopolymer concrete consist of conventional concrete constituents replacing cement by geopolymer materials. A geopolymer is a synthesized inorganic material that can be used in a wide range of applications such as concrete. Geopolymer concrete can be manufactured from wastes such as fly ash and granulated blast furnace slag. Consequently, it does not result in the emission of carbon dioxide gas and requires law energy during its manufacturing compared to that required during the production of cement. Thus, it is considered as an environmentally - friendly material. Another advantage of utilizing geopolymer concrete is the recycling of wastes production. This work focuses on the produce geopolymer concrete using some types of locally available industrial wastes alternative binder to the cement. The used industrial wastes were ground granulated blast furnace slag, fly ash and metakolin. The investigated materials were characterized using different analytical methods and techniques (XRD,.~XRF, particle size distribution, and physical and mechanical tests). Also, initial trials of different formulations were suggested to select the most promising mix. The present study was divided into two phase. The first phase determines the best mixes that realize the highest compressive strength of geopolymer concrete, through specifying optimal ratios of wastes (i.e., fly ash, metakaolin and granulated blast furnace . slag) were used as binder materials, activators and ratios of mixing activators and testing cubes at room temperature and after exposure to elevated temperature. The second phase studying the behavior of structural reinforced slabs manufactured by geopolymer concrete expose to elevated temperature. Thirty mixtures were made using granulated blast furnace slag contents (350 - 400 - 450) Kg/m ’ ,six granulated blast furnace slag only control mixes with molarities ( 10 - 12) molar, four mixes ( 10 % - 20 % ) metakolin were replaced by (10 -12 ) molar and four mixes ( 10 % - 20 % ) fly ash were replaced by (l0 - 12) molar, after that, cubes were made of geopolymer concrete from optimum mixtures from the results of the first stage and carrying out the necessary tests on them at normal temperature and after exposure to elevated temperatures then the reinforced slabs were made of geopolymer concrete as weIl as the necessary tests w~re performed for the slabs at normal temperature and after exposure to elevated temperatures. |