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.