Portal de Periódicos da CAPES

Application-oriented mix design optimization and characterization of zeolite-based geopolymer mortars

2018; Elsevier BV; Volume: 174; Linguagem: Inglês

10.1016/j.conbuildmat.2018.04.101

1879-0526

Néstor Ulloa, Haci Baykara, Mauricio Cornejo, Andrés Rigail-Cedeño, Cecilia Paredes, José Luís Villalba,

Magnesium Oxide Properties and Applications

In the present study, geopolymer mortar samples (ZGM) were prepared based on natural zeolites in which the effect of the addition of the MCI-2005 NS migratory type corrosion inhibitor was also evaluated through the compressive strength. Additionally, the design of the mixture was optimized using; two alkaline activators (NaOH 14 M and Na2SiO3) in different proportions, river sand as fine aggregate, curing time and temperature. All ZGM samples were characterized using quantitative X-ray diffraction, SEM-EDS, simultaneous TGA-DSC analysis, FTIR spectrometry and compressive strength. The best mixture and curing temperature, corresponding to activator/zeolite: 0.5, Na2SiO3/NaOH: 3, and 60 °C, was identified by the highest mechanical strength obtained after 28 days of aging of the synthesized specimens, which reached 17 MPa. The zeolite-based geopolymer mortars prepared can be used in real life applications due to acceptable compressive strength obtained, and the use of MCI-2005 NS favors the compressive strength in ZGM specimens at an early age up to 14 days.