Preparation, characterization and reaction kinetics of green cement: Ecuadorian natural mordenite-based geopolymers

This study was carried out to develop geopolymers derived from mordenite-rich tuffs. First the synthesis of mordenite-based geopolymer was explored through the mix design of three chemical reagents: NaOH, Na 4 Si 5 O 12 , and Ca(OH) 2 and varying curing temperature. All the types of synthesized geop...

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Bibliographic Details
Published in:Materials and structures 2017-06, Vol.50 (3), p.1, Article 188
Main Authors: Baykara, Haci, Cornejo, Mauricio H., Murillo, Roberto, Gavilanes, Andrea, Paredes, Cecilia, Elsen, Jan
Format: Article
Language:English
Subjects:
Age
Building construction
Building Materials
Carbonation
Cements
Civil Engineering
Compressive strength
Curing
Engineering
Fourier transforms
Geopolymers
Infrared spectroscopy
Machines
Manufacturing
Materials Science
Mechanical properties
Original Article
Processes
Reaction kinetics
Reagents
Solid Mechanics
Theoretical and Applied Mechanics
X-ray diffraction
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Summary:This study was carried out to develop geopolymers derived from mordenite-rich tuffs. First the synthesis of mordenite-based geopolymer was explored through the mix design of three chemical reagents: NaOH, Na 4 Si 5 O 12 , and Ca(OH) 2 and varying curing temperature. All the types of synthesized geopolymers were characterized by FT-IR spectroscopy, quantitative X-ray diffraction, SEM–EDS, TGA–DSC, compressive strength. The best mix design and curing temperature by means of the highest compressive obtained after 24 h were found as NaOH: 10 M, Na 4 Si 5 O 12 /NaOH ratio: 0.5, Ca(OH) 2 : 3% (w/w), and 60 °C, respectively, which showed values of compressive strength about 10 MPa. Then early age reaction kinetics was established using Avrami–Erofe’ev model. The carbonation, as side effect of reactive ingredient, was also observed during the experiment seemingly without causing any effect on mechanical properties of geopolymers.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-017-1057-z