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Article Dans Une Revue Cement and Concrete Research Année : 2012

The influence of sodium and potassium hydroxide on volume changes in cementitious materials

Résumé

This research investigates the influence of alkali hydroxides on unrestrained volume changes. A detailed multi-method approach is used to characterize the progress of cement hydration, autogenous and drying volume changes (i.e., shrinkage), autogenous RH decrease, compressive strength development, solid and liquid phases and the pore structure. It is noted that under autogenous conditions, alkalis magnify shrinkage; while upon external drying the extent of shrinkage is more similar. This is contrary to expectations which suggest that the reduction in the water activity and the negative pressure developed in the liquid phase, produced by alkali enrichment, should reduce shrinkage. Analysis of the autogenous RH decrease, pore solution chemistry and the mechanical properties indicates that the bulk shrinkage response is linked to multiple parameters including: (1) increased self-desiccation at early ages, (2) a reduction in the strength (and stiffness) of alkali-enriched systems and (3) liquid saturation effects.

Domaines

Matériaux

Dates et versions

hal-04184204 , version 1 (21-08-2023)

Identifiants

Citer

Gaurav Sant, Aditya Kumar, Cedric Patapy, Gwenn Le Saout, Karen Scrivener. The influence of sodium and potassium hydroxide on volume changes in cementitious materials. Cement and Concrete Research, 2012, 42 (11), pp.1447-1455. ⟨10.1016/j.cemconres.2012.08.012⟩. ⟨hal-04184204⟩
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