The volumetric stability, chloride binding capacity and stability of the Portland cement-GBFS pastes: An approach from the viewpoint of hydration products

Tongsheng Zhang; Wenli Tian; Yiqun Guo; Anna Bogush; Elena Khayrulina; Jiangxiong Wei; Qijun Yu

doi:10.1016/j.conbuildmat.2019.02.026

The volumetric stability, chloride binding capacity and stability of the Portland cement-GBFS pastes: An approach from the viewpoint of hydration products

Tongsheng Zhang, Wenli Tian, Yiqun Guo, Anna Bogush, Elena Khayrulina, Jiangxiong Wei, Qijun Yu

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

10 Citations (Scopus)

6 Downloads (Pure)

Abstract

An optimization of Portland cement (PC)-supplementary cementitious materials (SCMs) system focusing on the characteristics of hydration products is significantly important to decrease the thermal and chemical shrinkages and increase the chloride binding capacity, consequently to decline the diffusion rate of chloride into cement-based materials. In the present study, ultrafine granulated blast furnace slag (GBFS) was added into ultrafine Portland cement (PC) pastes to obtain homogenous hydration products, and then the hydration heat, chemical shrinkage, chloride binding capacity and stability of the PC-GBFS pastes were investigated. The results show that with the increase of the GBFS addition, the ultimate hydration heat of the PC-GBFS pastes increased initially and then decreased sharply, and the chemical shrinkage increased slightly with the increase of the GBFS addition. The cement pastes with 40–60% GBFS had acceptable hydration heat and chemical shrinkage, more important, its total bound chloride and non-water-soluble bound chloride increased by 24% and 177%, respectively, compared to those of Portland cement paste. Additionally, about 50% of chemically bound chloride in the form of Friedel's salt was water-soluble chloride due to ion-exchange, and 5–20% of physically bound chloride in C-S-H was non-water-soluble chloride after desorption.

Original language	English
Pages (from-to)	357-367
Number of pages	11
Journal	Construction and Building Materials
Volume	205
Early online date	10 Feb 2019
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.02.026
Publication status	Published - 30 Apr 2019
Externally published	Yes

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials, 205, (2019)
DOI: 10.1016/j.conbuildmat.2019.02.026

© 2019, Elsevier. Licensed under the Creative Commons AttributionNonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

Chemical shrinkage
Chemically bound chloride
Chloride binding stability
Friedel's salt
Physically bound chloride

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Materials Science(all)

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The volumetric stability, chloride binding capacity and stability of the Portland cement-GBFS pastes : An approach from the viewpoint of hydration products. / Zhang, Tongsheng; Tian, Wenli; Guo, Yiqun; Bogush, Anna; Khayrulina, Elena; Wei, Jiangxiong; Yu, Qijun.

In: Construction and Building Materials, Vol. 205, 30.04.2019, p. 357-367.

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

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abstract = "An optimization of Portland cement (PC)-supplementary cementitious materials (SCMs) system focusing on the characteristics of hydration products is significantly important to decrease the thermal and chemical shrinkages and increase the chloride binding capacity, consequently to decline the diffusion rate of chloride into cement-based materials. In the present study, ultrafine granulated blast furnace slag (GBFS) was added into ultrafine Portland cement (PC) pastes to obtain homogenous hydration products, and then the hydration heat, chemical shrinkage, chloride binding capacity and stability of the PC-GBFS pastes were investigated. The results show that with the increase of the GBFS addition, the ultimate hydration heat of the PC-GBFS pastes increased initially and then decreased sharply, and the chemical shrinkage increased slightly with the increase of the GBFS addition. The cement pastes with 40–60% GBFS had acceptable hydration heat and chemical shrinkage, more important, its total bound chloride and non-water-soluble bound chloride increased by 24% and 177%, respectively, compared to those of Portland cement paste. Additionally, about 50% of chemically bound chloride in the form of Friedel's salt was water-soluble chloride due to ion-exchange, and 5–20% of physically bound chloride in C-S-H was non-water-soluble chloride after desorption.",

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