Time-dependent characterization of Na2CO3 activated slag

B. Yuan; Q. Yu; H.J.H. Brouwers

doi:10.1016/j.cemconcomp.2017.09.005

Time-dependent characterization of Na2CO3 activated slag

B. Yuan, Q. Yu, H.J.H. Brouwers

Building Materials

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Abstract

This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gaylussite is observed after 1 d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2 d/3 d. Meanwhile, the gelation of C-(A)SH after 3 d of curing is identified by FTIR. The role of pH, CO32− anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7 d, 28 d and 180 d is derived.

Original language	English
Pages (from-to)	188-197
Number of pages	10
Journal	Cement & Concrete Composites
Volume	84
DOIs	https://doi.org/10.1016/j.cemconcomp.2017.09.005
Publication status	Published - Nov 2017

Keywords

Compressive strength
Isothermal calorimetry
Microstructure
Na CO activation
Reaction kinetics
Reaction products
Na2CO3 activation

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10.1016/j.cemconcomp.2017.09.005

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title = "Time-dependent characterization of Na2CO3 activated slag",

abstract = "This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gaylussite is observed after 1 d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2 d/3 d. Meanwhile, the gelation of C-(A)SH after 3 d of curing is identified by FTIR. The role of pH, CO32− anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7 d, 28 d and 180 d is derived.",

keywords = "Compressive strength, Isothermal calorimetry, Microstructure, Na CO activation, Reaction kinetics, Reaction products, Na2CO3 activation",

author = "B. Yuan and Q. Yu and H.J.H. Brouwers",

year = "2017",

month = nov,

doi = "10.1016/j.cemconcomp.2017.09.005",

language = "English",

volume = "84",

pages = "188--197",

journal = "Cement & Concrete Composites",

issn = "0958-9465",

publisher = "Elsevier",

}

TY - JOUR

T1 - Time-dependent characterization of Na2CO3 activated slag

AU - Yuan, B.

AU - Yu, Q.

AU - Brouwers, H.J.H.

PY - 2017/11

Y1 - 2017/11

N2 - This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gaylussite is observed after 1 d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2 d/3 d. Meanwhile, the gelation of C-(A)SH after 3 d of curing is identified by FTIR. The role of pH, CO32− anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7 d, 28 d and 180 d is derived.

AB - This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gaylussite is observed after 1 d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2 d/3 d. Meanwhile, the gelation of C-(A)SH after 3 d of curing is identified by FTIR. The role of pH, CO32− anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7 d, 28 d and 180 d is derived.

KW - Compressive strength

KW - Isothermal calorimetry

KW - Microstructure

KW - Na CO activation

KW - Reaction kinetics

KW - Reaction products

KW - Na2CO3 activation

UR - http://www.scopus.com/inward/record.url?scp=85029700710&partnerID=8YFLogxK

U2 - 10.1016/j.cemconcomp.2017.09.005

DO - 10.1016/j.cemconcomp.2017.09.005

M3 - Article

VL - 84

SP - 188

EP - 197

JO - Cement & Concrete Composites

JF - Cement & Concrete Composites

SN - 0958-9465

ER -

Time-dependent characterization of Na2CO3 activated slag

Abstract

Keywords

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