The structure of alkali silicate gel by total scattering methods

Handle URI:
http://hdl.handle.net/10754/599969
Title:
The structure of alkali silicate gel by total scattering methods
Authors:
Benmore, C.J.; Monteiro, Paulo J.M.
Abstract:
The structure of the alkali silicate gel (ASR) collected from the galleries of Furnas Dam in Brazil was determined by a pair distribution function (PDF) analysis of high energy X-ray diffraction data. Since this method is relatively new to concrete structure analysis a detailed introduction on the PDF method is given for glassy SiO2. The bulk amorphous structure of the dam material is confirmed as no Bragg peaks are observed in the scattered intensity. The real space results show that the local structure of the amorphous material is similar to kanemite (KHSi2O5:3H2O) however the long range layer structure of the crystal is broken up in the amorphous state, so that ordering only persists of the length scale of a few polyhedra. The silicate layer structure is a much more disordered than predicted by molecular dynamics models. The X-ray results are consistent with the molecular dynamics model of Kirkpatrick et al. (2005) [1] which predicts that most of the water resides in pores within the amorphous network rather than in layers. The total scattering data provide a rigorous basis against which other models may also be tested. © 2010.
Citation:
Benmore CJ, Monteiro PJM (2010) The structure of alkali silicate gel by total scattering methods. Cement and Concrete Research 40: 892–897. Available: http://dx.doi.org/10.1016/j.cemconres.2010.02.006.
Publisher:
Elsevier BV
Journal:
Cement and Concrete Research
KAUST Grant Number:
KUS-l1-004021
Issue Date:
Jun-2010
DOI:
10.1016/j.cemconres.2010.02.006
Type:
Article
ISSN:
0008-8846
Sponsors:
This work was supported by the U.S. DOE, Argonne National Laboratory under contract number DE-AC02-06CH11357. This publication was based on work supported in part by Award No. KUS-l1-004021, made by King Abdullah University of Science and Technology (KAUST) and by the National Science Foundation grant 062464. R.J. Kirkpatrick is thanked for providing the molecular dynamics simulation data.
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Full metadata record

DC FieldValue Language
dc.contributor.authorBenmore, C.J.en
dc.contributor.authorMonteiro, Paulo J.M.en
dc.date.accessioned2016-02-28T06:33:30Zen
dc.date.available2016-02-28T06:33:30Zen
dc.date.issued2010-06en
dc.identifier.citationBenmore CJ, Monteiro PJM (2010) The structure of alkali silicate gel by total scattering methods. Cement and Concrete Research 40: 892–897. Available: http://dx.doi.org/10.1016/j.cemconres.2010.02.006.en
dc.identifier.issn0008-8846en
dc.identifier.doi10.1016/j.cemconres.2010.02.006en
dc.identifier.urihttp://hdl.handle.net/10754/599969en
dc.description.abstractThe structure of the alkali silicate gel (ASR) collected from the galleries of Furnas Dam in Brazil was determined by a pair distribution function (PDF) analysis of high energy X-ray diffraction data. Since this method is relatively new to concrete structure analysis a detailed introduction on the PDF method is given for glassy SiO2. The bulk amorphous structure of the dam material is confirmed as no Bragg peaks are observed in the scattered intensity. The real space results show that the local structure of the amorphous material is similar to kanemite (KHSi2O5:3H2O) however the long range layer structure of the crystal is broken up in the amorphous state, so that ordering only persists of the length scale of a few polyhedra. The silicate layer structure is a much more disordered than predicted by molecular dynamics models. The X-ray results are consistent with the molecular dynamics model of Kirkpatrick et al. (2005) [1] which predicts that most of the water resides in pores within the amorphous network rather than in layers. The total scattering data provide a rigorous basis against which other models may also be tested. © 2010.en
dc.description.sponsorshipThis work was supported by the U.S. DOE, Argonne National Laboratory under contract number DE-AC02-06CH11357. This publication was based on work supported in part by Award No. KUS-l1-004021, made by King Abdullah University of Science and Technology (KAUST) and by the National Science Foundation grant 062464. R.J. Kirkpatrick is thanked for providing the molecular dynamics simulation data.en
dc.publisherElsevier BVen
dc.subjectAlkali-aggregate reaction (C)en
dc.subjectAmorphous material (B)en
dc.subjectDeterioration (C)en
dc.subjectPair distribution functionen
dc.subjectTotal scatteringen
dc.subjectX-ray (B)en
dc.titleThe structure of alkali silicate gel by total scattering methodsen
dc.typeArticleen
dc.identifier.journalCement and Concrete Researchen
dc.contributor.institutionArgonne National Laboratory, Argonne, United Statesen
dc.contributor.institutionUC Berkeley, Berkeley, United Statesen
kaust.grant.numberKUS-l1-004021en
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