Microstructure and engineering properties of Fe2O3(FeO)-Al2O3-SiO2 based geopolymer composites
Autor: | Elie Kamseu, Uphie Chinje Melo, Maria Cannio, Cristina Leonelli, Lynn Myllyam Beleuk à Moungam, Roberto Rosa, Rodrigue Cyriaque Kaze |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Materials science
Ferri-silicate Geopolymerization Laterite Mechanical strength Microstructure Rice husk ash (RHA) Strategy and Management 0211 other engineering and technologies 02 engineering and technology engineering.material Industrial and Manufacturing Engineering Flexural strength Aluminosilicate 021105 building & construction Composite material Dissolution Curing (chemistry) General Environmental Science Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology Geopolymer Polymerization engineering 0210 nano-technology |
Popis: | The objective of this study is to develop low cost, eco-friendly and sustainable building materials by applying the technology of mineral polymerization (geopolymerization) process on naturally abundant iron-rich aluminosilicate (laterite) materials. Iron-rich aluminosilicates based-geopolymer composites containing 10 to 40 wt% of rice husk ash (RHA) were cured at room temperature and at 90 °C. This paper examines the phase transformation, microstructural and mechanical changes that occur in the geopolymer composites when fine aggregates of quartz sand are added. Experimental results indicate good polycondensation and more cohesion resulting in high strength due to the better dissolution of RHA that provides soluble reactive silica to equilibrate the Si/Al and Si/Fe molar ratios. Ferro-sialates, Fe(Al)–S–H, were identified at the room temperature in addition to polysialates, S–A-N–H, phases. The flexural strength of resultant composites increases from 10 to 12 MPa for room temperature curing to ∼40 MPa when the composites were cured at about 90 °C as from the intensive formation of ferrisilicates. The formation of ferri-silicates that changed the flexural strength and microstructure seem to play significant role in the engineering properties of laterites based geopolymer composites making them promising candidates for applications as pavements, roads and building construction. |
Databáze: | OpenAIRE |
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