Formation of an intermediate C-S-H phase during the hydrothermal synthesis of gyrolite

Števula, L.; Petrovič, J.

doi:10.1016/0008-8846(83)90058-3

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…An XRD film pattern, taken with a Unicam camera, showed that the crystals were xonotlite (JCPDS Card 29-379). Formation of xonotlite under temperature and pressure conditions similar to those employed in this work has been reported (Luke et aL, 1981;Stevula and Petrovic, 1983). The small amount of Ca present in the hisingerite (0.91% CaO) restricted the formation of xonotlite in the pellet.…”

Section: Phases Produced In the Cores Of Hydrothermally Treated Thicksupporting

confidence: 72%

Hydrothermal Alterations of Hisingerite Material from a Basalt Quarry Near Geelong, Victoria, Australia

Shayan

Sanders

Lancucki

1988

Clays and clay miner.

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Abstract-To understand the genetic relationship between hisingerite material in the joints of an overlying grey basalt and nontronite and Fe-rich saponite in the joints and matrix of a more deuterically altered, underlying green basalt, the hisingerite material was treated in a series of hydrothermal experiments. No well-ordered clay mineral was produced at temperatures <340~ although extended treatment for 445 days and at 110~ or 42 days at 180~ resulted in the formation of materials that gave broad, weak, basal X-ray powder diffraction (XRD) reflections characteristic of 2:1 phyllosilicates. Hematite did not form at 110~ but it did form at 180~ in 1-and 6-week runs. Treatments at 340~ in Pt, Ag-Pd, and Au containers resulted in mixtures of Fe-rich saponite + hematite, but the same starting material treated at 340~ in stainless steel yielded, in addition, some chlorite, probably due to the more reducing conditions in the stainless steel container. Treatment of the unaltered grey basalt at 340~ and 50 MPa for 10 days resulted in complete alteration of olivine (and probably glass) to a trioctahedral smectite.The Fe-rich saponite produced by the hydrothermal treatment of the hisingerite material has a composition and XRD pattern similar to the Fe-rich saponite found in the green basalt and an XRD pattern similar to that produced by the hydrothermal treatment of the grey basalt; thus these clays may have had a similar origin. The compositions and XRD patterns of these clays are not similar, however, to those of the nontronite in the joints of the green basalt. The nontronite probably formed during a subsequent low-temperature alteration.

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Section: Phases Produced In the Cores Of Hydrothermally Treated Thicksupporting

confidence: 72%

Hydrothermal Alterations of Hisingerite Material from a Basalt Quarry Near Geelong, Victoria, Australia

Shayan

Sanders

Lancucki

1988

Clays and clay miner.

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“…After long periods of hydrothermal treatment, large plate crystals a few micrometers in size were observed in the specimens with Al/(Si ϩ Al) ϭ 0. From the XRD results, these can be assumed to be gyrolite crystals, as has been observed by Stevula and Miyake 21,22 in an earlier study. The decrease in strength observed after long periods of hydrothermal treatment appeared to be related to the formation of these gyrolite crystals.…”

Section: July 2000mentioning

confidence: 77%

Hydrothermal Solidification of Kaolinite–Quartz–Lime Mixtures

Maenami

Watanabe

Ishida

et al. 2000

Journal of the American Ceramic Society

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The strength development of hydrothermally solidified kaolinite-quartz-lime systems with kaolinite as the aluminum source was studied. The starting materials were mixed so that the Ca/(Si ؉ Al) atomic ratio was in the range 0.23 to 0.25, and the Al/(Si ؉ Al) ratio was between 0 to 0.50. Specimens were formed by uniaxial pressing and hydrothermal treatment under saturated steam pressure at 200°C for 2 to 20 h. For quartz-rich systems with Al/(Si ؉ Al) ‫؍‬ 0 and 0.05, strength development by the formation of calcium silicate hydrates, such as C-S-H and tobermorite (Ca 5 (Si 6 O 18 H 2 )⅐(4H 2 O), was observed. On the other hand, in the case of kaolinite-rich systems with Al/(Si ؉ Al) ‫؍‬ 0.24 to 0.50, strength development by the formation of hydrogarnet (Ca 3 Al 2 (SiO 4 )(OH) 8 ) was recognized, resulting in flexural strengths between 15 to 20 MPa. It is proposed that strength development is related to the formation of mesopores (ϳ0.04 m) that accompanied formation of the hydrogarnet.

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