The photoacoustic signal strength was measured on a series of similar portland cement pastes dried to different water contents. Under appropriate conditions this signal is a function of only the paste's specific heat capacity and thermal conductivity. Because of this, inferences can be made about th
A simple thermogravimetric study of hydrated cement
โ Scribed by C.J. Fordham; I.J. Smalley
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 173 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0008-8846
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โฆ Synopsis
The thermogravimetric picture of hydrated ordinary portland cement includes up to seven separate reactions. These include five dehydration reactions, a dehydroxylation reaction, and a decarbonation reaction. The five dehydration reactions represent the loss of free pore water from two different pore groups and three types of structural waters related to calcium silicate hydrates.
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Previous work has shown that, for a series of experimental autoclaved aerated concretes with porosities ranging from O.48 to 0.78, compressive strength is linearly related to the solid/pore volume ratio determined by helium pycnometry. In the work described here, this type of relationship has been
The early stages of cement hydration were investlgated by proton spinspin relaxation time (T c) measurements because these experiments can be performed much faster (in several seconds) than the characterlstlc time for a change in hydration evolution. In addition, comparing the free induction decays