کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6464634 | 1362207 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Calcic-plagioclase (anorthite) can be alkali activated resulting in hydroxysodalite.
- Maximum mechanical strength (57Â MPa) is obtained using NaOH/basalt ratio of 0.12.
- Reaction product has a mesoporous structure and BET surface area of 21Â m2Â gâ1.
Hydroxysodalite (H-SOD) microcrystalline particles were synthesized from basalt powder rich in calcic-plagioclase (anorthite) by alkali activation at 80 °C/24 h. Sodium hydroxide (NaOH) solution was used as alkaline activator. The reactivity of the natural solid precursor basalt was studied using differential scanning calorimetry (DSC), and a maximum reaction enthalpy of (âÎH) of 170 J/g was obtained. The chemical, mineralogical, and textural properties were obtained by using X-ray powder diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and N2-adsorption-desorption measurements. The synthesized material has a specific BET surface area of 20.5 m2 gâ1 approximately 200 times higher than raw basalt material (0.1 m2 gâ1). The compressive strength of basalt based H-SOD/sand composite samples cured at 80 °C for 24 h upon using different amounts of the activator (NaOH) was evaluated under dry and saturated conditions. The dry samples with NaOH/basalt mass ratio of 0.12 have reached a compressive strength of 57 MPa. Wet samples, on the other hand, showed a compressive strength of 25 MPa after seven days of soaking in water and four episodes of wetting and drying. The present work illustrates that crystalline H-SOD could be synthesized from cheap basalt powder precursor.
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Journal: Advanced Powder Technology - Volume 28, Issue 2, February 2017, Pages 473-480