Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature

Yanjie Tang; Wei Chen

doi:10.1016/j.conbuildmat.2019.117925

Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature

Yanjie Tang, Wei Chen (Corresponding author)

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

30 Citations (Scopus)

Abstract

This paper aims to investigate the effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature. Magnesium oxide, silica fume and calcium oxide were used in the preparation of MgO modified C–S–H gels with (Ca + Mg)/Si molar ratio of 0.8. The obtained solids were characterized with SEM, TEM-EDS, XRD, FT-IR, TG-DSC and ²⁹Si NMR. The results show that the transformation from M–S–H to C–S–H occurs when Mg to Si molar ratio decreases to 0.4. A concentrated distribution of Mg, Si and Ca elements is observed with TEM-EDS, indicating that a new phase magnesium calcium silicate hydrate (M–C–S–H) is possibly formed.

Original language	English
Article number	117925
Number of pages	8
Journal	Construction and Building Materials
Volume	240
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.117925
Publication status	Published - 20 Apr 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Calcium silicate hydrate
Elevated temperature
Magnesium silicate hydrate
Microstructure

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10.1016/j.conbuildmat.2019.117925

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title = "Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature",

abstract = "This paper aims to investigate the effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature. Magnesium oxide, silica fume and calcium oxide were used in the preparation of MgO modified C–S–H gels with (Ca + Mg)/Si molar ratio of 0.8. The obtained solids were characterized with SEM, TEM-EDS, XRD, FT-IR, TG-DSC and 29Si NMR. The results show that the transformation from M–S–H to C–S–H occurs when Mg to Si molar ratio decreases to 0.4. A concentrated distribution of Mg, Si and Ca elements is observed with TEM-EDS, indicating that a new phase magnesium calcium silicate hydrate (M–C–S–H) is possibly formed.",

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author = "Yanjie Tang and Wei Chen",

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T1 - Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature

AU - Tang, Yanjie

AU - Chen, Wei

PY - 2020/4/20

Y1 - 2020/4/20

N2 - This paper aims to investigate the effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature. Magnesium oxide, silica fume and calcium oxide were used in the preparation of MgO modified C–S–H gels with (Ca + Mg)/Si molar ratio of 0.8. The obtained solids were characterized with SEM, TEM-EDS, XRD, FT-IR, TG-DSC and 29Si NMR. The results show that the transformation from M–S–H to C–S–H occurs when Mg to Si molar ratio decreases to 0.4. A concentrated distribution of Mg, Si and Ca elements is observed with TEM-EDS, indicating that a new phase magnesium calcium silicate hydrate (M–C–S–H) is possibly formed.

AB - This paper aims to investigate the effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature. Magnesium oxide, silica fume and calcium oxide were used in the preparation of MgO modified C–S–H gels with (Ca + Mg)/Si molar ratio of 0.8. The obtained solids were characterized with SEM, TEM-EDS, XRD, FT-IR, TG-DSC and 29Si NMR. The results show that the transformation from M–S–H to C–S–H occurs when Mg to Si molar ratio decreases to 0.4. A concentrated distribution of Mg, Si and Ca elements is observed with TEM-EDS, indicating that a new phase magnesium calcium silicate hydrate (M–C–S–H) is possibly formed.

KW - Calcium silicate hydrate

KW - Elevated temperature

KW - Magnesium silicate hydrate

KW - Microstructure

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U2 - 10.1016/j.conbuildmat.2019.117925

DO - 10.1016/j.conbuildmat.2019.117925

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AN - SCOPUS:85076975521

SN - 0950-0618

VL - 240

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 117925

ER -

Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature

Abstract

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Keywords

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