Autor(a/res): Camila Aparecida Abelha Rocha, Guilherme Chagas Cordeiro & Romildo Dias Toledo Filho 

Resumo: This paper evaluates the hydration of oil well cement pastes containing sodium chloride (NaCl) and potassium chloride (KCl) using thermal analysis. Pastes were designed containing up to 36 % of NaCl and up to 34 % of KCl by the mass of water and water to cement ratio of 0.44. The curing was performed at 60 °C up to 7 days. X-ray diffraction was used with a complementary technique to identify the products formed. The results show that the pastes with salt addition presented the formation of Friedel’s salt due to the interaction of the ion Cl− with the aluminate phases. The dehydroxylation temperature of calcium hydroxide lowered with the increment of percentage of salt addition. At the first hours of curing, NaCl and KCl have accelerated the hydration reactions. For later ages, NaCl addition has retarded the hydration reactions and KCl has not modified significantly this property. Exceptions from these were observed for saturated pastes (36 % NaCl and 34 % KCl) that had the hydration reactions retarded in all ages evaluated.

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