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Rapid Hardening of Cement by the Addition of a Mechanically Activated Al(OH) 3 –Ca(OH) 2 Mixture

2000; Wiley; Volume: 83; Issue: 3 Linguagem: Inglês

10.1111/j.1151-2916.2000.tb01228.x

1551-2916

Makoto Kitamura, Masataka Kamitani, Mamoru Senna,

Magnesium Oxide Properties and Applications

Rapid hardening of cement was achieved in the present study by adding a mechanically activated Al(OH) 3 –Ca(OH) 2 mixture to the starting cement paste. Among the dominant parameters for hardening were the mechanical treatment time for the Al(OH) 3 powder and the Al(OH) 3 /Ca(OH) 2 ratio. The hardening mechanisms are discussed here in terms of the ionic concentration of the solution and the hydration products created when the Al(OH) 3 –Ca(OH) 2 mixture was added to water. Mechanical activation of the Al(OH) 3 powder accelerated dissolution into an aqueous alkaline solution and induced the formation of calcium aluminate hydration products. Those hydration products increased the compressive strength of the cement paste at a very early stage of hardening.