Abstract
ABSTRACTThe main target of this work was to investigate the thermal behavior and water resistance of geopolymer cement made from metakaolin as an aluminosilicate source using phosphoric acid solution (10 M) as a hardener. The obtained geopolymer cements were cured at room temperature for 28 days, the one part was treated at 200°C, 400°C, 600°C, 800°C and 1000°C, and the others were soaked in water for 28 days. The geopolymer cements were characterized by microstructural properties using X-ray diffractometry, infrared spectroscopy, microstructure, physical property based on water resistance and thermo-mechanical properties (thermal analysis, compressive strength). The results show that the compressive strength of the unheated geopolymer cement was 87.96 MPa. The ones soaked in water revealed a strength of 40.71 MPa. This indicates that the specimens soaked in water lose about 54% of their strengths. The X-ray patterns of heated geopolymer cements showed the formation of crystalline phases even at relatively low temperatures. It was typically found that the compressive strength of metakaolin-phosphate-based geopolymer cements decreases due to the hydrolysis of Si-O-P bonds in the presence of water.
Highlights
The terrestrial globe is made up of many materials that come from nature including kaolin, volcanic ash, etc. and from industrial by-products including fly ash, slag, etc. which have been used by man in his daily activities such as in construction, energy, medicine, alimentation, etc
Despite the compressive strength of metakaolinphosphate-based geopolymer cement soaked in water lose about 54% on its strength, the value of its strength remains higher (40.71 MPa) like Portland cement 42.5 suggesting this specimen could be used for the building materials
The prepared hardener with molar concentration 10 M was used as a chemical reagent for producing metakaolinphosphate-based geopolymer cements
Summary
The terrestrial globe is made up of many materials that come from nature including kaolin, volcanic ash, etc. and from industrial by-products including fly ash, slag, etc. which have been used by man in his daily activities such as in construction, energy, medicine, alimentation, etc. The demands for modern building materials arise constantly along with lifelong performance properties under different and/or special user conditions, financial aspects such as production and material costs, as well as environmental impact aspects are becoming increasingly important. Tchakouté et al [20] investigated the water resistance of metakaolin-based geopolymer cement using sodium water glass from sugarcane bagasse ash as an alternative hardener. No previous work has investigated the water resistance and thermal behavior of metakaolin-based geopolymer cements using the phosphoric acid solution as a hardener. The investigation of thermal behavior and water resistance of geopolymer cements from phosphoric acid solution as a hardener could be interesting. The thermal behavior and water resistance of metakaolin-phosphatebased geopolymer cements were investigated using thermal analysis (differential scanning calorimetric and thermal gravimetric analyzer (TG/DSC)), compressive strength, scanning electron microscope (SEM), water resistance test, X-ray diffractometry and infrared (IR) spectroscopy
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