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The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems

โœ Scribed by J.J. Beaudoin; R.F. Feldman

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
506 KB
Volume
8
Category
Article
ISSN
0008-8846

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โœฆ Synopsis

Helium diffusion studies were made on six different inorganic hydrated systems:

portland cement, magnesiLEn oxysulfate, magnesium oxychloride, tricalcium silicate, gypsum and selected molecular sieves. The helium intake versus tima curves obtained after structural water was removed incrementally, starting at 11% RH, provided data that enabled an assessment of the changing character of the solid phase. Changes in solid volume and solid density were monitored as water was removed from these systems.

Factors influencing physico-chemical processes such as structural collapse due to removal of interlayer or compositional water are discussed with reference to the systems studied. This comparative study also provided a further elucidation of the factors that affect the relocation of the water molecule into the s tructure.

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