Compared with the carbonization of hydration products of high alumina cement, the sulfation phenomenon of high alumina cement has not received sufficient attention from construction and usage units. In addition to carbon dioxide and acid gas, there are also gases such as sulfur dioxide and hydrogen sulfide in the atmosphere. They also have a strong erosive effect on the hydration products of the matrix of high alumina cement castables, ultimately leading to powdering and peeling of refractory castables.
The hydration products of high alumina cement can not only be sulfated by sulfur dioxide and hydrogen sulfide in the air, but also act on SO42- or H+in water sources. With the increase of activity and acidity, the stability of the three hydration products of high alumina cement decreases sharply.
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