Fast setting cements containing

FAST-SETTING CEMENTS CONTAINING THE PHASES CijA. CAFj... 

A.D. Wilson and J.W. Nicholson, Acid—Base Cements (Cambridge University Press, Cambridge, 1993). F.G. Sherif and E.S. Michaels, Fast-setting cements from liquid waste phosphorous pentoxide containing... 

F.G. Sherif and E.S. Michaels, Fast-setting cements from solid phosphorous pentoxide containing materials,... 

It is known, that the monoclinic tricalcium aluminate with alkalis in solid solution reacts with water slowly (see Chap. 2). Therefore this phase can be used as a source of aluminate ions in reaction of ettringite formation. The fast-setting cements are known which contain 35 % NCj A, apart from the high belite content of 57% or calcium orthosilicate phases belite and alite (C2S—38%, 038—21%) [1]. 

E.G. Sherif and A.G. Ciamei, East-setting cements from superphosphoric acid, US Patent 4,734,133, 1988. E.G. Sherif and E.A. Via, Production of solid phosphorous pentoxide containing materials for fast-setting... 

Ishikawa, K., Miyamoto, M., Takechi, M., Toh, T., Kon, M., Nagayama, M., and Asaoka, K. 1997. Non-decay type fast-setting calcium phosphate cement Hydroxyapatite putty containing an increased amount of sodium alginate. Journal of Biomedical Materials Research Part A 36 393-99. 

The cement content in deflocculated castables is low. Hence, the amount of heat they produce during setting is low. The time of installation can therefore be limited to 24 h. There are special ULCC castables, which are installed in blast furnace trough systems. They contain metallic additives and catalysts. Because of these, an intensive exothermal reaction takes place after the addition of water. Hydrogen is produced out of this reaction. It creates capillaries as it escapes from the structure. These capillaries help in the self-drying process because they increase the surface area from which heat is remov. Because of the fast reaction and drying, the furnace can be put into operation in a short time. 

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