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Caption : figure s1. geopolymers produced and demolded after 72 hours.

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Caption : figure s2. mössbauer spectrum of 57fe obtained at room temperature for the iot.

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Caption : figure s3. eds mapping for si of the iot and of the solid fractions hr15–4h(s) and hr15–24h(s).

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Caption : figure s4. eds mapping for si of the iot and residual insoluble solid fractions from sr12–3h, sr15–3h and sr18–3h.

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Caption : figure s5. sem images of gsas, gsr18 and gsasf50 geopolymers.