Skip to Main content Skip to Navigation
Journal articles

Phase assemblage of a 5 year-old cement paste after submission to various high temperature and cooling regime.

Résumé : In case of fire in a structure, concrete undergoes internal transformations that can alter its durability. It is also important to take into account the effect of the cooling regime after temperature exposure on the phase assemblage of the cementitious matrix. An experimental investigation was carried out to investigate the changes of a cement paste, heated up to various temperature up to 1000°C then cooled in water or cooled in air for comparison. Quantitative evolution of phase assemblage is obtained by various techniques (TGA, XRD, NMR and ICP-AES). For both cooling regimes, the hydrated crystallised phases tend to become disordered phases for lower exposition temperature. These phases coexist with anhydrous products for intermediate temperature and these new anhydrous phases become the majority for higher temperature. However, the two cooling regimes show differences. Equilibrium of hydrated aluminate phases is modified, (e.g. AFm/AFt ratio). There are structural modifications of the phases in particular for C-S-H. For water cooling regime, beyond 600°C, a leaching is observed in particular for calcium.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03136043
Contributor : Ifsttar Cadic <>
Submitted on : Tuesday, February 9, 2021 - 2:14:37 PM
Last modification on : Monday, February 22, 2021 - 8:18:10 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2021-09-05

Please log in to resquest access to the document

Identifiers

Collections

Citation

Mickael Saillio, Hassen Sabeur, Julien Vincent, Bruno Zitoun. Phase assemblage of a 5 year-old cement paste after submission to various high temperature and cooling regime.. Construction and Building Materials, 2021, 279, pp.122440. ⟨10.1016/j.conbuildmat.2021.122440⟩. ⟨hal-03136043⟩

Share

Metrics

Record views

78