TY - JOUR
T1 - Analysis of the production conditions of geopolymer matrices from natural pozzolana and fired clay brick wastes
AU - Silva, Guido
AU - Castañeda, David
AU - Kim, Suyeon
AU - Castañeda, Alvaro
AU - Bertolotti, Bruno
AU - Ortega-San-Martin, Luis
AU - Nakamatsu, Javier
AU - Aguilar, Rafael
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/8/10
Y1 - 2019/8/10
N2 - 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.
AB - 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.
KW - Compressive strength
KW - Curing conditions
KW - Fired clay brick wastes
KW - Geopolymers
KW - Natural pozzolana
KW - Silica modulus
KW - Sodium oxide content
KW - Water content
UR - http://www.scopus.com/inward/record.url?scp=85064910744&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2019.04.247
DO - 10.1016/j.conbuildmat.2019.04.247
M3 - Article
AN - SCOPUS:85064910744
SN - 0950-0618
VL - 215
SP - 633
EP - 643
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -