Influence of calcium to silica ratio on H2 gas production in calcium silicate hydrate

Add time:08/18/2019    Source:sciencedirect.com

Water radiolysis is of particular concern for the conditioning of radioactive waste with cement materials. For safety assessment, water radiolysis issued from pore solution and hydrates must be considered because radiolytic molecular hydrogen H2 is produced, which is potentially explosive. Calcium silicate hydrate (C-S-H), main hydrates with Portlandite in Portland cements, were synthesized with different C/S ratios at 60% relative humidity. The samples were characterized by X-ray diffraction and thermogravimetric analysis before irradiation. Then, samples were irradiated under γ-irradiation, and the radiolytic hydrogen production has been quantified. The results show that, in these conditions, the H2 production in CSH is comparable to the one in bulk water, with primary yield ranging from 0.35 to 0.6 molecule/100eV.

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