Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

Riccardo Maddalena; Kefei  Li; Philip A. Chater; Stefan Michalik; Andrea Hamilton

doi:10.1016/j.conbuildmat.2019.06.024

Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

Riccardo Maddalena, Kefei Li, Philip A. Chater, Stefan Michalik, Andrea Hamilton

Civil And Environmental Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, ²⁹Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present from day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.

Original language	English
Pages (from-to)	554-565
Number of pages	12
Journal	Construction and Building Materials
Volume	223
Early online date	23 Jul 2019
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.06.024
Publication status	Published - 30 Oct 2019

Keywords

calcium-silicate-hydrate (C-S-H)
characterization
thermal analysis
X-ray diffraction

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10.1016/j.conbuildmat.2019.06.024Licence: CC BY 4.0

Maddalena-etal-CBM-2019-Direct-synthesis-of-a-solid-calcium-silicateFinal published version, 1.86 MBLicence: CC BY 4.0

Cite this

@article{640e268478f54c06be800e817a74426b,

title = "Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)",

abstract = "We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, 29Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present from day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.",

keywords = "calcium-silicate-hydrate (C-S-H), characterization, thermal analysis, X-ray diffraction",

author = "Riccardo Maddalena and Kefei Li and Chater, {Philip A.} and Stefan Michalik and Andrea Hamilton",

year = "2019",

month = oct,

day = "30",

doi = "10.1016/j.conbuildmat.2019.06.024",

language = "English",

volume = "223",

pages = "554--565",

journal = "Construction and Building Materials",

issn = "0950-0618",

}

TY - JOUR

T1 - Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

AU - Maddalena, Riccardo

AU - Li, Kefei

AU - Chater, Philip A.

AU - Michalik, Stefan

AU - Hamilton, Andrea

PY - 2019/10/30

Y1 - 2019/10/30

N2 - We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, 29Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present from day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.

AB - We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, 29Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present from day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.

KW - calcium-silicate-hydrate (C-S-H)

KW - characterization

KW - thermal analysis

KW - X-ray diffraction

UR - https://www.sciencedirect.com/journal/construction-and-building-materials

U2 - 10.1016/j.conbuildmat.2019.06.024

DO - 10.1016/j.conbuildmat.2019.06.024

M3 - Article

VL - 223

SP - 554

EP - 565

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -

Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

Abstract

Keywords

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Andrea Hamilton

Decommissioning, Immobilisation and Storage soluTIons for NuClear wasTe InVEntories (DISTINCTIVE)

GREAT: Marie Curie International Research Staff Exchange Scheme

A novel synthesis process for calcium silicate hydrate gel (C-S-H) with a tobermorite-like structure

Cite this

Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Profiles

Andrea Hamilton

Projects

Decommissioning, Immobilisation and Storage soluTIons for NuClear wasTe InVEntories (DISTINCTIVE)

GREAT: Marie Curie International Research Staff Exchange Scheme

Datasets

A novel synthesis process for calcium silicate hydrate gel (C-S-H) with a tobermorite-like structure

Cite this