Effect of BaCO3 on C3A hydration

Gismera-Diez, S.; Manchobas-Pantoja, B.; Carmona-Quiroga, Paula María; Blanco-Varela, María Teresa

doi:10.1016/j.cemconres.2015.03.009

Cited by 16 publications

(2 citation statements)

References 13 publications

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“…The FTIR analyses (Table 6) confirmed the XRD results. The infrared spectrum for paste C 3 A exhibited the absorption lines characteristic of katoite, some (in the 790 cm -1 -820 cm -1 and 520 cm -1 -530 cm -1 ranges) overlapping with the signals for the remaining anhydrous C 3 A [16]. Slight carboaluminate contamination was likewise observed.…”

Section: Ftir Studymentioning

confidence: 90%

Can calcium aluminates activate ternesite hydration?

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Carmona-Quiroga

et al. 2018

Cement and Concrete Research

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Aluminium hydroxide (AH 3) has recently been shown to be able to activate hydration in ternesite, a phase found in some calcium sulfoaluminate (CSA) cements. This study explored the capacity of a number of calcium aluminates (C 3 A, C 12 A 7 , CA and C 4 A 3) to activate ternesite hydraulic reactivity. After laboratory synthesis, the aluminates were blended with ternesite at a ratio of 1:2 and their hydration was monitored with isothermal conduction calorimetry for 7 days at 25 ºC. The resulting pastes were analysed with XRD, FTIR and DTA. The presence of ternesite in the pastes altered the aluminate heat flow curves, shortening the induction period and bringing the reaction peak forward, an indication of hastened hydration. Ternesite also altered the reaction products, which included calcium monosulfoaluminate hydrate and strätlingite.

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Section: Ftir Studymentioning

confidence: 90%

Can calcium aluminates activate ternesite hydration?

Montes

Pato

Carmona-Quiroga

et al. 2018

Cement and Concrete Research

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“…The signal at −81.5ppm denoting Al uptake by the C-S-H gel was more intense in the 7% HsT (1:2) than in the 7% HcG (1:2) paste. In another vein, Gismera et al [32] contended that monocarboaluminate was present, attributing the signal at 3540 cm −1 to its OH groups. The wide signal with a small peak observed in this study may have been indicative of such a presence.…”

Section: Nmr Analysismentioning

confidence: 99%

Concrete/Glass Construction and Demolition Waste (CDW) Synergies in Ternary Eco-Cement-Paste Mineralogy

et al. 2022

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The study described sought further understanding of the synergies in a mix of CDW pozzolans, containing (calcareous and siliceous) concrete and glass waste, used to prepare ternary eco-cement paste bearing 7% of the binary blend at concrete/glass ratios of 2:1 and 1:2. The mineralogical phases in the 2-day, 28-day, and 90-day cement matrices were identified and monitored using XRF, XRD-Rietveld, SEM-EDX, FT-IR, and NMR. The findings showed that changes in the reaction kinetics in the ternary blended pastes relative to OPC pastes depended on the nature of the recycled concrete and the glass content. Adding the binary mix bearing calcareous concrete (at a ratio of 2:1) favoured ettringite, portlandite, and amorphous phase formation, whilst the blends with siliceous concrete favoured C-S-H gel formation. Monocarboaluminate was detected in the 90-day siliceous concrete and glass pastes in amounts similar to those found in the reference OPC paste.

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