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DYNA

versão impressa ISSN 0012-7353

Resumo

GIRALDO, CAROLINA et al. DURABILITY OF WHITE PORTLAND CEMENT BLENDED WITH ULTRAMARINE BLUE PIGMENT. Dyna rev.fac.nac.minas [online]. 2010, vol.77, n.164, pp.45-51. ISSN 0012-7353.

The Ultramarine Blue pigment (UB) is a sodium polysulfide aluminosilicate that reacts with the tricalcium aluminate (C3A) of the white Portland cement in presence of water, generating considerable amounts of early ettringite and a lesser proportion of tobermorite. This early ettringite is presented in the form of non-oriented fibers improving the mechanical performance of mortars, and at the same time leaving little amounts of C3A available for the formation of delayed etringite. The durability of white Portland cement mortars substituted in 0%, 10% and 20% wt with Ultramarine Blue was evaluated in this research, through essays of capillary suction and evaluation of longitudinal change of mortars exposed to a sodium sulfate solution with a concentration of 5% (ASTM C1012). The results show a higher compressive strength and flexure, a significant reduction of expansion, and a reduction up to 800% of absorbed water in mortars with Ultramarine Blue, due to the formation of additional early ettringite and tobermorite, this phases by the electron scanning microscope (SEM) were observed.

Palavras-chave : Ultramarine Blue; Durability; Ettringite; Capillary Suction; Mechanical strength; Blended cements.

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