Title
Analysis of the production conditions of geopolymer matrices from natural pozzolana and fired clay brick wastes
Date Issued
2019
Access level
restricted access
Resource Type
journal article
Publisher(s)
Elsevier Ltd
Abstract
The improvement of the mechanical properties of geopolymer matrices relies on the characteristics of the source materials as well as in proper optimization of the alkaline activating solution and curing conditions during geopolimerization. This study presents the optimization analyses carried out to determine the proper production conditions of Fired Clay Brick (FCB) and Natural Pozzolana (NP)-based geopolymers. The results indicate that high compressive strengths of up to 37 MPa and 26 MPa can be obtained for FCB and NP-based geopolymers, respectively when the proper production conditions are employed. The optimum alkaline solution for FCB consisted of Ms = 0.60, Na2O content of 8%, water/binder ratio = 0.27 with oven curing conditions between 65 and 80 °C for 7 days. On the other hand, NP-based geopolymers with the highest mechanical properties were obtained with an alkaline solution composed of a Ms = 1.08, 8% Na2O content and 0.52 of water/binder ratio cured in an oven at 65 °C for 7 days. The methodology for the optimization of production conditions of geopolymer matrices validated in this study demonstrated to provide consistent results and, therefore, could be applied for the analysis of the production process of geopolymers based on other aluminosilicate sources. © 2019 Elsevier Ltd
Start page
633
End page
643
Volume
215
Number
38
Language
English
Subjects
Scopus EID
2-s2.0-85064910744
Source
Construction and Building Materials
ISSN of the container
0950-0618
Sponsor(s)
This work was supported by CONCYTEC and SENCICO PERU under the project: “GeoBloque: Desarrollo de bloques de construcción ultraligeros con geopolímeros” (Contract No. 105-207-FONDECYT ). Additional support was received from CONCYTEC ( J108-2016 ) under the ERANet-LAC project ( ELAC2015/T02-0721 ): “Development of eco-friendly composite materials based on geopolymer matrix and reinforced with waste fibers”. The authors are very grateful to Compañía Minera Agregados Calcáreos S.A ( COMACSA ) for providing raw materials and the use of its facilities and equipment. The authors would like to mention CAM-PUCP for facilitating the use of the XRD equipment. Finally, Guido Silva and David Castañeda acknowledge the support from CONCYTEC (Contract No 232-2015-FONDECYT ) for their fellowship funding.
Sources of information:
Directorio de Producción Científica