Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8093315 | Journal of Cleaner Production | 2018 | 45 Pages |
Abstract
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 40â¯wt% of rice husk ash (RHA) were cured at room temperature and at 90â¯Â°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 12â¯MPa for room temperature curing to â¼40â¯MPa when the composites were cured at about 90â¯Â°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.
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Rodrigue Cyriaque Kaze, Lynn Myllyam Beleuk à Moungam, Maria Cannio, Roberto Rosa, Elie Kamseu, Uphie Chinje Melo, Cristina Leonelli,