Crystal structure of ettringite

Moore, A. E.; Taylor, H. F. W.

doi:10.1107/s0567740870002443

Cited by 259 publications

(102 citation statements)

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“…The sample was characterized by laboratory powder X-ray diffraction. The measured unit-cell parameters are a 0 = 11.240 ± 0.001 Ǻ, c 0 = 21.468 ± 0.006 Ǻ, in good agreement with values from the literature [5,6]. A transparent, prismatic fragment 5mm long and 2mm wide was picked from a larger specimen and ground to a fine powder of about 5µm particle size.…”

Section: Methodssupporting

confidence: 82%

“…The formation of secondary ettringite is associated with the expansion and degradation of concrete exposed to sulfate attack [4]. The crystal structure of ettringite is known [5,6,7,8]. It is composed of columns of Ca 6 [Al 2 (OH) 12 .24H 2 with a large proportion of interconnected void space allowing some mobility of water and hydrated ions.…”

Section: Introductionmentioning

confidence: 99%

“…The crystal structure of ettringite is known [5,6,7,8]. It is composed of columns of Ca 6 [Al 2 (OH) 12 .24H 2 with a large proportion of interconnected void space allowing some mobility of water and hydrated ions. The ettringite structure is quite flexible allowing interchange of atomic species resulting in the structure being adopted by other minerals with through series solid solution [9] and potential applications in waste management [10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of pressure on the crystal structure of ettringite

Clark

Colas

Kunz

et al. 2008

Cement and Concrete Research

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Section: Methodssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of pressure on the crystal structure of ettringite

Clark

Colas

Kunz

et al. 2008

Cement and Concrete Research

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“…These results corroborate the findings of Moore and Taylor [9]. The intensity of the endotherm at 770~ due to C-S-H was not affected by temperature and wetting and drying cycles.…”

Section: Dtasupporting

confidence: 94%

Durability of cementitious binder derived from industrial wastes

Singh

Garg

1997

Mat. Struct.

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A B S T R A C I R I~ S U M I~The durability of cementitious binder hydrated at 27~ and 50~ under high humidity was examined by alternate wetting and drying, as well as heating and cooling, cycles at temperatures ranging from 27~ to 60~ and by performance in water. The results show that cementitious binder hardened at 50~ possesses higher water resistance and lower porosity than the binder hardened at 27~ A decrease in the strength of the cementitious binder was observed with an increase in temperature and in the wetting and drying and heating and cooling cycles. The maximum decrease in strength occurred at 60~ The cementitious binder cured at 27~ showed a much smaller decrease in strength with a rise in temperature and in weathering cycles. The changes in strength of the cementitious binder were monitored by differential thermal analysis and microscopy. On a examind la durabilitd des mat&iaux liants hydrat& h

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“…2 SO 4 3 ऄ26H 2 O with Zࢼ2 in hexagonal setting. 3,4 The ettringite structure is represented by trigonal columns of =AlOH 6 ?…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cr(VI)-Ettringite in Portlandite Suspensions as a Function of pH

徹

彰

隆一

et al. 2006

J. Ceram. Soc. Japan

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The synthesis of CrVI-ettringite was attempted in portlandite suspensions for the immobilization of hazardous hexavalent Cr. The reagents NaAlO 2 and CrO 3 were used by dissolving them in deionized water to obtain 0.1 molL solutions, which were mixed with portlandite suspensions and stirred for 3 h at room temperature in CO 2 -free synthetic air. CaAl atomic ratios were varied from 1.0 to 5.0 against the CrAl atomic ratios 1.0, 1.5 and 2.0. Run products were evaluated by XRD, XRF and FE-SEM. The results showed that CrVI-ettringite formed under the conditions of pH 10.9 and more always associates with calcite. The calcite was also formed due to the carbonation of the remaining portlandite CaOH 2 during drying in ambient air. The calculated yields of CrVI-ettringite generally exceeded 80 massಚ, and 85.6 massಚ was reached for the stoichiometric mixture. In the run products obtained at pH lower than 10.9, no CrVI-ettringite was identified, and the XRF analysis showed free-CaO and free-Al 2 O 3 other than free-CrO 3 potentials each corresponding to calcite, ill-crystallized gibbsite gibbsite gels and the soluble chromatite CaCrO 4 adsorbed and trapped in the jelly gibbsite gels.

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Crystal structure of ettringite

Cited by 259 publications

References 0 publications

Effect of pressure on the crystal structure of ettringite

Effect of pressure on the crystal structure of ettringite

Durability of cementitious binder derived from industrial wastes

Synthesis of Cr(VI)-Ettringite in Portlandite Suspensions as a Function of pH

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