Microstructure and engineering properties of Fe2O3(FeO)-Al2O3-SiO2 based geopolymer composites

JOURNAL OF CLEANER PRODUCTION

卷:199

Article

Kaze, Rodrigue Cyriaque¹  Moungam, Lynn Myllyam Beleuk a²  Cannio, Maria³  Rosa, Roberto³  Kamseu, Elie^2,3  Melo, Uphie Chinje¹  Leonelli, Cristina³ 

[1] Univ Yaounde I, Fac Sci, Lab Appl Inorgan Chem, POB 812, Yaounde, Cameroon

[2] MINRESI MIPROMALO, Local Mat Promot Author, Lab Mat, POB 2396, Yaounde, Cameroon

[3] Univ Modena & Reggio Emilia, Dept Engn Enzo Ferrari, Via Vignolese 905-A, I-41125 Modena, Italy

关键词: Laterite;    Rice husk ash (RHA);    Geopolymerization;    Ferri-silicate;    Mechanical strength;    Microstructure;   

DOI  :  10.1016/j.jclepro.2018.07.171

来源: Elsevier

【 摘 要 】

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 degrees C. This paper examines the phase transformation, microstructural and mechanical changes that occur in the geo-polymer 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 degrees 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. (C) 2018 Published by Elsevier Ltd.

【 授权许可】

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