Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10136945 | Results in Physics | 2018 | 22 Pages |
Abstract
Geothermal clay rich in kaolinite was first prepared into geopolymers in the preparation of alkali-activated cementitious binders (AACBs). Effects of silica sand and steel fiber aggregates on the microstructure and mechanical strength of the geothermal-metakaolin-based geopolymer were studied. Measurements of compressive strength, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and nuclear magnetic resonance (NMR) were used to characterize the geopolymers. With the replacement of silica sand, combination between sand and geopolymer gel was formed, the geopolymers therefore showed compressive strength higher than 34â¯MPa with silica sand up to 50%. However, silica sand of coarse particle size (0.3-0.6â¯mm) caused porous structure in the geopolymers, hindering the increase in their compressive strength. With the replacement of steel fiber, the flexural strength and flexural fracture toughness of the geopolymers were greatly improved.
Related Topics
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Authors
Xing Li, Feng Rao, Shaoxian Song, Mario A. Corona-Arroyo, Noemi Ortiz-Lara, Ena A. Aguilar-Reyes,