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Zeta potential and surface area measurements on ettringite

✍ Scribed by Suh-Shiang Chen; P.K. Mehta

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
133 KB
Volume
12
Category
Article
ISSN
0008-8846

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✦ Synopsis

It is well known that certain clay minerals can swell by adsorption of water. A combination of high surface area and unsatisfied surface charges is believed to be responsible for the attractive force between water and these clay minerals. On the basis of earlier work at the University of California (I-3), it was hypothesized that, in a similar fashion, ettringite is able to adsorb water and expand. The purpose of this study was to investigate the surface area and surface charge characteristics of a specimen of ettringite prepared by paste hydration of a stiochiometric mixture of C3A, gypsum, and water. The surface charge of the ettringite specimen was determined by measurement of zeta potential. Small-angle X-ray Scattering (SAXS) technique was used for determination of the surface area.

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