Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal stability and high-temperature behavior of the natural borate colemanite: An aggregate in radiation-shielding concretes
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: αV0 = 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.
Thermal stability and high-temperature behavior of the natural borate colemanite: An aggregate in radiation-shielding concretes
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: αV0 = 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.
Thermal stability and high-temperature behavior of the natural borate colemanite: An aggregate in radiation-shielding concretes
Lotti, Paolo (Autor:in) / Comboni, Davide (Autor:in) / Gigli, Lara (Autor:in) / Carlucci, Lucia (Autor:in) / Mossini, Eros (Autor:in) / Macerata, Elena (Autor:in) / Mariani, Mario (Autor:in) / Gatta, Giacomo Diego (Autor:in) / P. Lotti / D. Comboni
10.04.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Materials Science (all) , Thermal expansion coefficient , High temperature , Civil and Structural Engineering , Settore CHIM/03 - Chimica Generale e Inorganica , Settore ING-IND/20 - Misure e Strumentazione Nucleari , Boron , Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul , Colemanite , Building and Construction , Synchrotron X-ray diffraction , Amorphization , Dehydration , Neutron radiation shielding concrete
DDC:
690
| British Library Online Contents | 2016
| British Library Online Contents | 2016