Analysis of cubic and orthorhombic C3A hydration in presence of gypsum and lime
Source abstract
Abstract
Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) have been used to study the microstructural changes and phase development that take place during the hydration of cubic (pure) and orthorhombic (Na-doped) tricalcium aluminate (C 3 A) and gypsum in the absence and presence of lime. The results demonstrate that important differences occur in the hydration of each C 3 A polymorph and gypsum when no lime is added; orthorhombic C 3 A reacts faster with gypsum than the cubic phase, forming longer ettringite needles; however, the presence of lime slows down the formation of ettringite in the orthorhombic sample. Additional rheometric tests showed the possible effects on the setting time in these cementitious mixes.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Drilling and Well Engineering · Grouting, Rheology, and Soil Mechanics
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References (25)
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