Stability of strätlingite in the CASH system

Okoronkwo, Monday Uchenna; Glasser, F. P.

doi:10.1617/s11527-015-0789-x

Cited by 69 publications

(32 citation statements)

References 37 publications

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“…Strätlingite was first formed in the paste containing 35% calcined clay. At least 30% of PC have to be replaced by metakaolin to form crystalline strätlingite (Ambroise, et al, 1994) because strätlingite is not stable in presence of calcium hydroxide (Okoronkwo and Glasser, 2016). Carboaluminate hydrates formed due to a reaction 318 of AFm phases with the limestone contained in the cement.…”

Section: Sections Of the In-situ Xrd Level Plots Of Cement Pastes Blementioning

confidence: 99%

Calcareous smectite clay as a pozzolanic alternative to kaolin

Danner

Norden²,

Justnes

2019

European Journal of Environmental and Civil Engineering

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The hydration of cement pastes with addition of a kaolinite rich clay (Clay A) and a calcareous smectite rich clay (Clay B) was investigated with isothermal calorimetry, in-situ XRD, PXRD, TGA and EPMA. Portland cement was replaced by 20, 35 and 50 weight% calcined clay in cement pastes and mortars. Both clays showed good pozzolanic reactivity. However, clay A having a higher amount of metakaolin and higher specific surface was more reactive in terms of CH consumption and mortar strength development. 50% replacement of PC by calcined Clay A resulted in increased 28 day compressive strength while mortars with 50% calcined Clay B showed almost equal 28 day compressive strength compared to the reference. With increasing addition of calcined clay, the second aluminate reaction (formation of AFm phase) of cement hydration was accelerated and the cement pastes became under sulphated. This resulted in a stronger and earlier sulphate depletion peak, especially in pastes with calcined Clay A. Due to 3% calcite in the used cement the main hydration product found was carboaluminate hydrate. The favoured formation of carboaluminate hydrate stabilised ettringite in the cement pastes.

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Section: Sections Of the In-situ Xrd Level Plots Of Cement Pastes Blementioning

confidence: 99%

Calcareous smectite clay as a pozzolanic alternative to kaolin

Danner

Norden²,

Justnes

2019

European Journal of Environmental and Civil Engineering

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“…According to the studies carried out by Y. Jeong (2018), L. Xu (2017), M. Okoronkwo (2016) and T. Matschei (2007), C 2 ASH 8 can be also detected at the similar peak positions in the calcium sulfoaluminate-belite cement-gypsum, calcium aluminate cement-Portland cement-anhydrite, Portland-CASH or CASH systems. 10,[35][36][37] . On 28 day, there appears the diffraction signal of C 3 AH 6 , but its diffraction intensity is weaker than that in the RW material without SS.…”

Section: Mineral Compositions and Distributionmentioning

confidence: 99%

Effect of sodium silicate on Portland cement/calcium aluminate cement/gypsum rich-water system: strength and microstructure

et al. 2019

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“…As the temperature exceeds 50°C, C 3 AH 6 and AH 3 predominate. Moreover, it was found that elevated humidity is favorable to the formation of C 3 AH 6 and Al(OH) 3 [2,3,[5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The cubic form was produced from C 1-x Sr x Al 2 O 4 (the product of hydration was Sr-doped C 3 AH 6 ), Ca 7 ZrAl 6 O 18 (formation of C 3 AH 6 was strongly dependent on particle size and surface area), C 2 AH 8 (in the presence of polycarboxylic acid type waterreducer), in the presence of two doped nano-additives Fe-TiO 2 and V-TiO 2 , C 4 AF, mixture of Portland cement and CAC, industrial CAC containing CA and CA 2 , C 2 AH 8 and CAH 10 with different amount of Al 2 O 3 . Fine nodules of C 3 AH 6 were obtained from C 2 AH 8 ; the granular-shaped crystals from C 2 AH 8 (in the presence of alumina powder) and 10-100 nm layered nano-particles [4,8,[15][16][17][18][19][20][21][22][23]. Moreover, some authors reported that the presence of gypsum, deflocculants on the basis of polycarbonate ethers and the carbonation process was a favorable factor to give C 3 AH 6 [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Structure, microstructure and thermal stability characterizations of C3AH6 synthesized from different precursors through hydration

Litwinek

Madej

2019

J Therm Anal Calorim

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In this paper, the influence of precursors (CA, C 7 A 3 Z, C 12 A 7 , C 6 SrA 3 Z, C 7 A 2 FZ and commercial calcium aluminate cement 'Gorkal 70') on the structure, microstructure and thermal stability characterizations of C 3 AH 6 through hydration was investigated. The materials were characterized by X-ray diffraction, differential thermal analysis-thermogravimetric analysis-evolved gas analysis and scanning electron microscopy combined with energy-dispersive spectroscopy 24 h and 72 h after starting the hydration process. Results of investigation confirmed the influence of precursor on shape and grain size of C 3 AH 6 . The CaO/Al 2 O 3 mass ratio of precursors before the hydration process affects the size of C 3 AH 6 crystals: the higher the CaO/Al 2 O 3 value, the larger the size of the crystals of C 3 AH 6 . Moreover, the presence of Sr and Fe affects the formation of stable C 3 AH 6 crystals.

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Stability of strätlingite in the CASH system

Cited by 69 publications

References 37 publications

Calcareous smectite clay as a pozzolanic alternative to kaolin

Calcareous smectite clay as a pozzolanic alternative to kaolin

Effect of sodium silicate on Portland cement/calcium aluminate cement/gypsum rich-water system: strength and microstructure

Structure, microstructure and thermal stability characterizations of C3AH6 synthesized from different precursors through hydration

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