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 af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › 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.

Originalsprog	Engelsk
Tidsskrift	Cement and Concrete Research
Vol/bind	115
Sider (fra-til)	145-159
Antal sider	15
ISSN	0008-8846
DOI	https://doi.org/10.1016/j.cemconres.2018.10.017
Status	Udgivet - 1 jan. 2019

Adgang til dokumentet

10.1016/j.cemconres.2018.10.017

Andre filer og links

http://www.scopus.com/inward/record.url?scp=85055263157&partnerID=8YFLogxK

Citationsformater

@article{77f30661f7b6426db02408ff73bda12c,

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",

month = jan,

day = "1",

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

language = "English",

volume = "115",

pages = "145--159",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Pergamon Press",

}

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

UR - http://www.scopus.com/inward/record.url?scp=85055263157&partnerID=8YFLogxK

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 -