Determination of Positions of Zeolitic Calcium Atoms and Water Molecules in Hydrothermally Formed Aluminum‐Substiqtuted Tobermorite‐1.1nm Using Synchrotron Radiation Powder Diffraction Data

Yamazaki, Shoko; Toraya, Hideo

doi:10.1111/j.1151-2916.2001.tb01071.x

Cited by 19 publications

(11 citation statements)

References 29 publications

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“…[22][23][24][25]. As a structure common to all, they have a layered structure based on a Ca-O polyhedral sheet flanked on each side by liner silicate chains.…”

Section: Resultsmentioning

confidence: 99%

Charge states of Ca atoms in β-dicalcium silicate

Mori

Kiyanagi

Yonemura

et al. 2006

Journal of Solid State Chemistry

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“…[22][23][24][25]. As a structure common to all, they have a layered structure based on a Ca-O polyhedral sheet flanked on each side by liner silicate chains.…”

Section: Resultsmentioning

confidence: 99%

Charge states of Ca atoms in β-dicalcium silicate

Mori

Kiyanagi

Yonemura

et al. 2006

Journal of Solid State Chemistry

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“…Both in natural and in synthetic compounds, silicon may be partly substituted by aluminum [up to Al:(Al+Si) = 0.13-0.14, according to Sakiyama et al (2000)], a substitution which may be balanced by a higher Ca content and/or higher O 2 by OH substitution. That has been confi rmed by the structural study carried on a synthetic specimen of tobermorite 11 Å of composition near to Ca 5 Si 5.5 Al 0.5 O 16 (OH)·5H 2 O, through Rietveld refi nement of synchrotron radiation powder diffraction data (Yamazaki and Toraya 2001). 9 Å phases: "clinotobermorite 9 Å" and riversideite "Clinotobermorite 9 Å" and riversideite, are obtained by heating, at 300°C, clinotobermorite and tobermorite 11 Å, respectively.…”

Section: å Phases: Clinotobermorite and Tobermorite åmentioning

confidence: 99%

Modular Microporous Minerals: Cancrinite-Davyne Group and C-S-H Phases

Bonaccorsi

2005

Reviews in Mineralogy and Geochemistry

103

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In this chapter, we illustrate and discuss two distinct groups of microporous phases: the cancrinite group and the C-S-H compounds of the tobermorite and gyrolite families. The compounds in the fi rst group present a three-dimensional purely tetrahedral framework with, apart from a single exception, Si:Al ratio equal to 1; in the mineralogical classifi cations they are included among feldspathoids and are generally “regarded …… distinct from zeolites, in part, at least, because of the presence of large volatile anions” (Coombs et al. 1998). The members of the second group are characterized by mixed frameworks built up by silicon (and aluminum) tetrahedra and calcium polyhedra. A common feature of both groups is the modular character of their frameworks, which are built up through various stacking ways of a single module (as in the minerals of the cancrinite-davyne family) and two or more modules as in the case of the C-S-H phases

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“…A 638-642 band corresponds to SB of Q 3 (0Al) (Kirkpatrick et al 1997) and Q 3 (1Al). The SB and SS Q 3 bands indicate linkages across the (002) interlayer, which contains channels for water molecules and exchangeable alkali cations (Tsuji and Komarneni 1989;Yamazaki and Toraya 2001). A ~840-900 shoulder indicates SS of Q 1 (0Al) sites .…”

Section: Raman Spectroscopymentioning

confidence: 99%

Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete

Jackson

Mulcahy

Chen

et al. 2017

American Mineralogist

156

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Pozzolanic reaction of volcanic ash with hydrated lime is thought to dominate the cementing fabric\ud and durability of 2000-year-old Roman harbor concrete. Pliny the Elder, however, in first century CE\ud emphasized rock-like cementitious processes involving volcanic ash (pulvis) “that as soon as it comes\ud into contact with the waves of the sea and is submerged becomes a single stone mass (fierem unum\ud lapidem), impregnable to the waves and every day stronger” (Naturalis Historia 35.166). Pozzolanic\ud crystallization of Al-tobermorite, a rare, hydrothermal, calcium-silicate-hydrate mineral with cation\ud exchange capabilities, has been previously recognized in relict lime clasts of the concrete. Synchrotron-based\ud X-ray microdiffraction maps of cementitious microstructures in Baianus Sinus and Portus\ud Neronis submarine breakwaters and a Portus Cosanus subaerial pier now reveal that Al-tobermorite\ud also occurs in the leached perimeters of feldspar fragments, zeolitized pumice vesicles, and in situ\ud phillipsite fabrics in relict pores. Production of alkaline pore fluids through dissolution-precipitation,\ud cation-exchange and/or carbonation reactions with Campi Flegrei ash components, similar to processes\ud in altered trachytic and basaltic tuffs, created multiple pathways to post-pozzolanic phillipsite and\ud Al-tobermorite crystallization at ambient seawater and surface temperatures. Long-term chemical\ud resilience of the concrete evidently relied on water-rock interactions, as Pliny the Elder inferred. Raman\ud spectroscopic analyses of Baianus Sinus Al-tobermorite in diverse microstructural environments\ud indicate a cross-linked structure with Al3+ substitution for Si4+ in Q3\ud tetrahedral sites, and suggest\ud coupled [Al3++Na+\ud ] substitution and potential for cation exchange. The mineral fabrics provide a geoarchaeological\ud prototype for developing cementitious processes through low-temperature rock-fluid\ud interactions, subsequent to an initial phase of reaction with lime that defines the activity of natural\ud pozzolans. These processes have relevance to carbonation reactions in storage reservoirs for CO2 in\ud pyroclastic rocks, production of alkali-activated mineral cements in maritime concretes, and regenerative\ud cementitious resilience in waste encapsulations using natural volcanic pozzolans

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Determination of Positions of Zeolitic Calcium Atoms and Water Molecules in Hydrothermally Formed Aluminum‐Substiqtuted Tobermorite‐1.1nm Using Synchrotron Radiation Powder Diffraction Data

Cited by 19 publications

References 29 publications

Charge states of Ca atoms in β-dicalcium silicate

Charge states of Ca atoms in β-dicalcium silicate

Modular Microporous Minerals: Cancrinite-Davyne Group and C-S-H Phases

Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete

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