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• W2034997218 abstract "Abstract The volcanic ash occurring as an abundant and readily accessible natural resource in the Central African country of Cameroon was used to synthesize aluminosilicate geopolymers using sodium hydroxide as the sole alkaline activator. Both the curing conditions and the Na 2 O/SiO 2 molar ratio were found to influence the development of compressive strength of the geopolymer cement paste, which achieved a maximum strength of 55 MPa at Na 2 O/SiO 2  = 0.3. The formation of a mortar by the addition of 40 wt% sand to the optimized geopolymer cement composition reduced the compressive strength to 30 MPa, still within the useful range for construction applications. The geopolymers consist largely of X-ray amorphous material with a small content of crystalline phases. Scanning electron microscopy showed a homogenously distributed mixture of lath-shaped and agglomerated morphologies, with a homogeneous distribution of Si, Al and O in the geopolymer matrix. The geopolymers are relatively stable to heat, shrinking only slowly and retaining about 60% of their as synthesized compressive strength on heating to 900 °C. The FTIR spectra of both the as synthesized and heated geopolymers show two broad absorbance bands, between 820–1250 cm −1 and 450–730 cm −1 assigned to the internal vibrations of Si–O–Si, and Si–O–Al respectively. The compressive strengths and the thermal stability of these materials suggest their suitability for building applications and low-grade refractories." @default.
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• W2034997218 date "2011-12-01" @default.
• W2034997218 modified "2023-10-16" @default.
• W2034997218 title "Synthesis and thermal properties of inorganic polymers (geopolymers) for structural and refractory applications from volcanic ash" @default.
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• W2034997218 doi "https://doi.org/10.1016/j.ceramint.2011.05.002" @default.
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