1. Changes to structure of hydrated portland cement on drying and rewetting observed by helium flow techniques
- Author
-
R.F. Feldman
- Subjects
wetting ,Portland cement ,Materials science ,mouillage ,hydratation ,chemistry.chemical_element ,Mineralogy ,helium ,hélium ,Building and Construction ,Penetration (firestop) ,Parallel plate ,law.invention ,chemistry ,ciment Portland ,law ,Monolayer ,Béton ,General Materials Science ,Composite material ,hydration ,Helium ,Concrete - Abstract
Helium flow techniques are applied to the hydrated portland cement-water system during rewetting. Measurements of solid volume and density demonstrate irreversible changes to the structure. Measurement of changes in volume of interlayer space are made and are shown to be due to new alignment of layers and to the moving apart of layers as a result of water penetration. The density of the interlayer water is found by these techniques to be 1.20 ± 0.08 gm/ml. Calculation of the parameter Total Volume/Monolayer Volume for the interlayer space yields a value of 1.32. This shows that the space approximates that bounded between two parallel plates.
- Published
- 1974