A study on the hydration products of a non-expansive sulfoaluminate cement

Kasselouri, V.; Tsakiridis, P.E.; Malami, Ch.; Georgali, B.; Alexandridou, Christiana

doi:10.1016/0008-8846(95)00168-9

Cited by 110 publications

(39 citation statements)

References 8 publications

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“…The calcium sulphoaluminate cements consist mainly in the phase Ye'elemite, also called Klein's salt or tetracalcium trialuminate sulphate (C 4 A 3 Ŝ) (5). Other advantages of these cements over PC are: lower power consumption, higher early strength development, excellent durability in saline environments and good protection to steel reinforcement (6). The calcium sulphoaluminate (C 4 A 3 Ŝ) can be synthesized by calcining stoichiometric proportions of calcium carbonate (CaCO 3 ), aluminium hydroxide (Al(OH) 3 ) and gypsum (CaSO 4 ·2H 2 O) in a furnace at temperatures ranging from 1250 to 1300 °C for 3 hours (7).…”

Section: Introductionmentioning

confidence: 99%

Effect of citric acid and the hemihydrate amount on the properties of a calcium sulphoaluminate cement

Velazco¹,

Almanza-Robles²,

Cortés³

et al. 2014

Mater. construcc.

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ABSTRACT:The influence of citric acid on the hydration and strength development of a calcium sulphoaluminate cement was investigated. Cement pastes were prepared by mixing calcium sulphoaluminate (C 4 A 3 Ŝ) with 15, 20 and 25wt% of hemihydrate (CŜH 0.5 ). Citric acid was added as a retarder at 0 and 0.5wt%. The samples were cured at 20 °C for periods of time from 1 to 28 days to evaluate their compressive strength and to characterize the hydration products by scanning electron microscopy and X-ray diffraction. Calorimetric curves showed that the retarding agent considerably decreases the heat release rate and the quantity of total heat released. The main product after the curing was ettringite (C 6 AŜ 3 H 32 ). The morphology of this phase consisted of long and thin needles growing radially on the cement grains. Samples with 15wt% of hemihydrate and 0.5wt% of citric acid developed the highest compressive strength (70 MPa) at 28 days of curing. RESUMEN: Efecto de la adición de ácido cítrico y la cantidad de yeso sobre las propiedades del cemento de sulfoaluminato de calcio.Se investigó el efecto del ácido cítrico sobre la hidratación y propiedades mecánicas de un cemento de sulfoaluminato de calcio. El C 4 A 3 Ŝ se mezcló con 15, 20 y 25% e.p. de hemihidrato (CŜH 0.5 ). Se agregó ácido cítrico como retardante en 0 y 0.5% e.p. Las muestras fueron curadas a 20 °C por periodos de 1 a 28 días para realizar mediciones de resistencia a la compresión y caracterizar los productos de hidratación mediante microscopía electrónica de barrido y difracción de rayos X. Las curvas de calorimetría mostraron ue el ácido cítrico disminuye la velocidad de liberación de calor y la cantidad de calor liberado durante la hidratación. La resistencia a la compresión alcanzó un máximo de 70 MPa en muestras con 15% e.p. de hemihidrato y 0,5% e.p de ácido cítrico. Los resultados muestran a la etringita (C 6 AŜ 3 H 32 ) como principal producto de hidratación. Se observa a esta fase con morfología acicular creciendo sobre las partículas de cemento.

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Section: Introductionmentioning

confidence: 99%

Effect of citric acid and the hemihydrate amount on the properties of a calcium sulphoaluminate cement

Velazco¹,

Almanza-Robles²,

Cortés³

et al. 2014

Mater. construcc.

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“…The reactivity of ferrite (C 4 AF) during hydration in these cements is slower than that of C 4 A 3 S [22] and it is not well understood.…”

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confidence: 99%

In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2014

Cement and Concrete Research

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Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here, we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA cements. Rietveld quantitative phase analysis has been used to establish the degree of reaction (α). The hydration of a mixture of ye'elimite and gypsum revealed that ettringite formation (α~70% at 50 h) is limited by ye'elimite dissolution. Two laboratory-prepared BCSA cements were also studied: non-active-BCSA and active-BCSA cements, with β-and α′ H -belite as main phases, respectively. Ye'elimite, in the non-active-BCSA system, dissolves at higher pace (α~25% at 1 h) than in the active-BCSA one (α~10% at 1 h), with differences in the crystallization of ettringite (α~30% and α~5%, respectively). This behavior has strongly affected subsequent belite and ferrite reactivities, yielding stratlingite and other layered phases in non-active-BCSA. The dissolution and crystallization processes are reported and discussed in detail.

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“…It has also been reported [36][37] that C 5 S 2 $ has better hydraulic properties after autoclaving, it transforms to a rapidly hardening and high strength compound [38]. Additionally, the hydration reaction of calcium sulphoaluminate initiates rapidly and forms ettringite and AH 3 [39], contributing to faster setting of CSA cement than Portland cement [40]. All these results indicate that ternesite can be hydrated at a long-term, adding yeelimite not only induces hydration ternesite but also favors the formation of gypsum [6,18], this gypsum in the pastes leads to ettringite formation and reduced the amount of formed monosulfoaluminate [40].…”

Section: Hydrationmentioning

confidence: 94%

Mineralogical stabilization of Ternesite in Belite Sulfo-Aluminate Clinker elaborated from limestone, shale and phosphogypsum

et al. 2018

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Abstract. This paper investigates the mineralogical evolution of sulfoaluminate clinker elaborated from moroccan prime materials limestone, shale and phosphogypsum as a byproduct from phosphoric acid factories. The advantage of the production of this type of clinker is related to the low clinkerisation temperature which is known around 1250°C, and to less consumption quantity of limestone thus enabling less CO 2 emissions during the decarbonation process compared to that of Portland cement. In this study we determine the stability conditions of belite sulfoaluminate clinker containing belite (C 2 S) ye'elimite (C 4 A 3 $) and ternesite (C 5 S 2 $). The hydration compounds of this clinker are also investigated. The monitoring of the synthesized and hydrated phases is performed by X-Ray Diffraction and Infrared spectroscopy. The results show the formation of ternesite at 800°C and the stabilization of clinker containing y'elminite, belite and ternesite at temperatures between 1100 and 1250°C.

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A study on the hydration products of a non-expansive sulfoaluminate cement

Cited by 110 publications

References 8 publications

Effect of citric acid and the hemihydrate amount on the properties of a calcium sulphoaluminate cement

Effect of citric acid and the hemihydrate amount on the properties of a calcium sulphoaluminate cement

In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

Mineralogical stabilization of Ternesite in Belite Sulfo-Aluminate Clinker elaborated from limestone, shale and phosphogypsum

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