A quantitative study of the C3A hydration

Shiju Joseph; Jørgen Skibsted; Özlem Cizer

doi:10.1016/j.cemconres.2018.10.017

A quantitative study of the C₃A hydration

Shiju Joseph^*, Jørgen Skibsted, Özlem Cizer

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Abstract

The effect of fineness, gypsum content and water – cement (w/c) ratio on the hydration of C₃A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, ²⁷Al MAS NMR) and numerical modelling. It is proposed that the retardation of C₃A in the presence of calcium sulphates could be (or partially) due to the surface coverage of C₃A from ettringite precipitation. After the depletion of gypsum, the main calorimetric hydration peak is analyzed using a dissolution mechanism. The numerical model captures the main hydration peak, including peak broadening effects, which increase with the gypsum content and decrease with the fineness. It is found that the increase in w/c ratio (from 0.5 to 1.0) enhances the overall degree of hydration of C₃A by 7 days of hydration in systems with and without gypsum, which is attributed to the increase in free water with increasing w/c ratio.

Original language	English
Journal	Cement and Concrete Research
Volume	115
Pages (from-to)	145-159
Number of pages	15
ISSN	0008-8846
DOIs	https://doi.org/10.1016/j.cemconres.2018.10.017
Publication status	Published - 1 Jan 2019

Keywords

Hydration
Kinetics
Modelling
Tricalcium aluminate

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10.1016/j.cemconres.2018.10.017

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title = "A quantitative study of the C3A hydration",

abstract = "The effect of fineness, gypsum content and water – cement (w/c) ratio on the hydration of C3A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, 27Al MAS NMR) and numerical modelling. It is proposed that the retardation of C3A in the presence of calcium sulphates could be (or partially) due to the surface coverage of C3A from ettringite precipitation. After the depletion of gypsum, the main calorimetric hydration peak is analyzed using a dissolution mechanism. The numerical model captures the main hydration peak, including peak broadening effects, which increase with the gypsum content and decrease with the fineness. It is found that the increase in w/c ratio (from 0.5 to 1.0) enhances the overall degree of hydration of C3A by 7 days of hydration in systems with and without gypsum, which is attributed to the increase in free water with increasing w/c ratio.",

keywords = "Hydration, Kinetics, Modelling, Tricalcium aluminate",

author = "Shiju Joseph and J{\o}rgen Skibsted and {\"O}zlem Cizer",

year = "2019",

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doi = "10.1016/j.cemconres.2018.10.017",

language = "English",

volume = "115",

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journal = "Cement and Concrete Research",

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TY - JOUR

T1 - A quantitative study of the C3A hydration

AU - Joseph, Shiju

AU - Skibsted, Jørgen

AU - Cizer, Özlem

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The effect of fineness, gypsum content and water – cement (w/c) ratio on the hydration of C3A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, 27Al MAS NMR) and numerical modelling. It is proposed that the retardation of C3A in the presence of calcium sulphates could be (or partially) due to the surface coverage of C3A from ettringite precipitation. After the depletion of gypsum, the main calorimetric hydration peak is analyzed using a dissolution mechanism. The numerical model captures the main hydration peak, including peak broadening effects, which increase with the gypsum content and decrease with the fineness. It is found that the increase in w/c ratio (from 0.5 to 1.0) enhances the overall degree of hydration of C3A by 7 days of hydration in systems with and without gypsum, which is attributed to the increase in free water with increasing w/c ratio.

AB - The effect of fineness, gypsum content and water – cement (w/c) ratio on the hydration of C3A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, 27Al MAS NMR) and numerical modelling. It is proposed that the retardation of C3A in the presence of calcium sulphates could be (or partially) due to the surface coverage of C3A from ettringite precipitation. After the depletion of gypsum, the main calorimetric hydration peak is analyzed using a dissolution mechanism. The numerical model captures the main hydration peak, including peak broadening effects, which increase with the gypsum content and decrease with the fineness. It is found that the increase in w/c ratio (from 0.5 to 1.0) enhances the overall degree of hydration of C3A by 7 days of hydration in systems with and without gypsum, which is attributed to the increase in free water with increasing w/c ratio.

KW - Hydration

KW - Kinetics

KW - Modelling

KW - Tricalcium aluminate

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U2 - 10.1016/j.cemconres.2018.10.017

DO - 10.1016/j.cemconres.2018.10.017

M3 - Journal article

AN - SCOPUS:85055263157

SN - 0008-8846

VL - 115

SP - 145

EP - 159

JO - Cement and Concrete Research

JF - Cement and Concrete Research

ER -

A quantitative study of the C₃A hydration

Abstract

Keywords

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