Analysis of individual particles of substituted ettringite in cement pastes by analytical electron microscopy was combined with micromorphological study of the same particles by SEM and TEM. Aluminum and sulfur were individually deficient in many of the particles, but there was usually enough silico
Investigation of the composition and morphology of individual particles of portland cement paste: 1. CSH gel and calcium hydroxide particles
✍ Scribed by E.E. Lachowski; Sidney Diamond
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 752 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
This investigation represents an attempt to combine analytical electron microscope analysis of the composition of individual particles separated from hydrated portland cements with a micromorphological examination of the same particles usinq high-resolution scanning electron microscopy. The particles described here are all referrable to the C-S-H gel type III category, or to impure calcium hydroxide. Variations in composition turned out to be substantial, not only from one C-S-H gel particle to another, but between different small regions of the same fragment of gel.
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The General model for C-S-H gel described by Richardson and Groves (1) has been extended to incorporate elements other than Ca, Si, O and H which have been detected by X-ray microanalysis of gels in hardened Portland cement and blended cement pastes.
This paper deals with the effect of the leaching process of cement based materials on their mechanical properties. This process induces mainly a total leaching of Ca(OH), and a progressive decalcification of C-S-H which leads to a gradient of C/S ratio in the leaching zone. In a previous work, we ve