Determination of boron contained in a cementitous matrix used for the transport or the storage of radioactive waste

Grandjean, J.; Joulia, A.; Smith, Agnès; Naït-Ali, B.; Tessier-Doyen, Nicolas; Garnier, T.; Labergri, Fabien

doi:10.1016/j.pnucene.2018.07.006

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“…Moreover, with a view to ensure safe shipment of nuclear material, boron enriched cementitious containers have been proficiently proposed. In this perspective, the optimization of the neutron shielding effect requires a homogeneous distribution of boron within the cement matrix [25].…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and high-temperature behavior of the natural borate colemanite: An aggregate in radiation-shielding concretes

Lotti

Comboni

Gigli

et al. 2019

Construction and Building Materials

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Colemanite is a natural borate that can be used as an aggregate in neutron-radiation shielding concretes. In this study, we report its thermal behavior, up to 500°C, by describing: 1) its dehydration mechanisms and 2) its thermo-elastic parameters. The thermal expansion of colemanite is significantly anisotropic. The refined volume thermal expansion coefficient at ambient conditions is: V0 = 4.50(10)10-5 K-1. The loss of structural H2O occurs at least from ~ 240 °C and at T > 325 °C, an irreversible amorphization occurs, followed by a complete dehydration. The potential implications on the use of colemanite as concrete-aggregate are discussed.

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Section: Introductionmentioning

confidence: 99%