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Characteristics and Application of High Alumina Cement

(1) The rapid hardening and early strength and early strength growth, should be used for emergency repair works (roads, bridges, plugging, etc.) and early strength high requirements engineering. However, the strength of high alumina cement may be decreased, especially in the hot and humid environment, which is higher than 30, the strength decreases faster, and even cause the structural damage. Therefore, the use of high alumina cement should be carefully used in structural engineering.
 
(2) Hydration heat is large, and concentrated in the early release. Suitable for winter construction, can not be used for large volume concrete engineering and high temperature and humidity environment of the project.
 
(3) Have good resistance to sulfate attack. This is because the main component of low calcium aluminates, free calcium oxide rarely, structure of cement stone, denser, therefore it is suitable for in sulfate resistant engineering requirements.
 
(4) Alkali poor. High alumina cement and alkaline solution contact, even when a small amount of alkaline compounds within the concrete aggregate, will cause erosion, it can not be used in contact with alkali solution.
 
(5) Good heat resistance. Because of the high temperature, the solid state reaction was produced, and the combination of the sintering process was replaced by hydration, which made the high alumina cement can keep high strength at high temperature.
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