The hydration of synthetic brownmillerite in presence of low Ca-sulfate content and calcite monitored by quantitative in-situ-XRD and heat flow calorimetry
Ectors D, Neubauer J, Götz-Neunhoeffer F, Götz-Neunhoeffer F, Neubauer J (2013)
Publication Language: English
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: Elsevier
Pages Range: 61-68
Journal Issue: 54
DOI: 10.1016/j.cemconres.2013.08.011
Abstract
We present here experimental data of the hydration of C4AF in a Portland cement environment with low sulfate content. Calorimetric data indicate a distinct two-step main reaction of C4AF, which was successfully deconvoluted by laboratory scale in-situ-XRD in combination with the G-factor method and a quantitative approach by mass balance estimation with normalized peak areas of hydrate phases. The presented data here suggest a rapid unhindered dissolution of C4AF after depletion of sulfate in the pore solution, which is then rapidly leading to an oversaturation with respect to sulfate-AFm-16 (C4A$H16). Since the sulfate content of the mixture is low, a second acceleration of C4AF dissolution, due to precipitation of hydroxy-AFm-19 (C4AH19) was observable after the decline in ettringite (C6A$ 3H32) content and the subsequent conversion to sulfate-AFm-16 (C4A$H16). © 2013 Elsevier Ltd.
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APA:
Ectors, D., Neubauer, J., Götz-Neunhoeffer, F., Götz-Neunhoeffer, F., & Neubauer, J. (2013). The hydration of synthetic brownmillerite in presence of low Ca-sulfate content and calcite monitored by quantitative in-situ-XRD and heat flow calorimetry. Cement and Concrete Research, 54, 61-68. https://dx.doi.org/10.1016/j.cemconres.2013.08.011
MLA:
Ectors, Dominique, et al. "The hydration of synthetic brownmillerite in presence of low Ca-sulfate content and calcite monitored by quantitative in-situ-XRD and heat flow calorimetry." Cement and Concrete Research 54 (2013): 61-68.
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