ettringite


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ettringite

[′e·triŋ‚īt]
(mineralogy)
Ca6 Al2(SO4)3(OH)12·26H2O A mineral composed of hydrous basic calcium and aluminum sulfate.

ettringite

A mineral, high in sulfate calcium sulfoaluminate; occurs naturally or is formed by sulfate attack on mortar and concrete; designated as a cement bacillus in older literature.
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References in periodicals archive ?
XRD established that in addition to CSH and CASH, ettringite was also a major product of hydrated ash (Fig.
Another session talked about the fire protection through ettringite materials by Dr Gautam Bhattacharya.
If all the sulfate reacts before all the C3A does then the level of the sulfate ions decreases and the ettringite becomes unstable and undergoes a second reaction over several hours to form monosulfate which is lower in sulfate.
When in contact with water, CSA cement immediately begins to produce ettringite, a mineral that fills the pores of the cement matrix, making it a denser material; contributes to the mix gaining high early strength; and, creates a small amount of expansion.
The interfacial zone is a region of low concentration of CSH, high concentrations of CH and ettringite, and high porosity.
A state-of- the-art review on delayed ettringite attack on concrete.
This second-stage process precipitates sulphate as a highly insoluble calcium sulphoaluminate mineral known as ettringite.
Alkali aggregate reaction and delayed ettringite formation: common features and differences, in 14th International conference on alkali aggregate reaction ICAAR14, 24-27 May 2012, France.
Cement hydration was evident from the presence of calcium silicate hydrate and ettringite in the secondary electron images at higher magnifications (Figure 2).
Effects of polymer modification on the formation of high sulphoaluminate or ettringite type (Aft) crystals in polymer-modified mortars Cement and Concrete Research 24( 8) 1492-1494 (1994)
Therefore, fewer products of CSH and ettringite were produced in the early stage of hydration, which leads to slow strength development and retards the setting time (Hewlett 2003).
3]A as well as formed ettringite crystal whiskers film which slows the rapid coagulation of [C.