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 journalArticle

7 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)357-367
Number of pages11
JournalConstruction and Building Materials
Volume205
Early online date10 Feb 2019
DOIs
Publication statusPublished - 30 Apr 2019
Externally publishedYes

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
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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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