Abstract
The activation of materials, including those derived from mining waste, has garnered growing interest among researchers and industrialists seeking to produce eco-friendly binders. Activation can be achieved through various methods, with mechanical grinding and chemical alkaline activation using substances like NaOH being the most commonly employed. This study specifically investigates the properties of alkali-activated coal gangue-lime (AACG-L) using techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM-EDS). Lime (CaO) is acknowledged as an effective cementing agent that enhances the reactivity of raw coal gangue. The synthesis of AACG-L involves two successive stages: grinding and reducing grain size with 5% lime incorporation, followed by activation using 5 M NaOH and subsequent 28-day curing. XRD, FTIR, and SEM-EDS analyses confirm that the resulting AACG-L product primarily comprises hydrated calcium aluminate silicate (C-A-S-H), hydrated alkaline aluminate silicate (N-A-S-H), and portlandite Ca(OH)2.
Published Version
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