Effect of P2O5 incorporated in slag on the hydration characteristics of cement-slag system

Yu Zhang*, Yu Chen, Oğuzhan Çopuroğlu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This paper presents the influence of P2O5 incorporated in slag on the hydration characteristics of cement-slag system. It was found that the gradual addition of phosphorus oxide in slag did not change overall mineralogy of the hydration products. Except hydration retardation in the dormant stage, chemically bound water and portlandite contents, hydration degree of slag, and pore structure at all investigated ages were similar among cement-slag pastes with different P2O5 percentages. Furthermore, significantly higher amount of monosulfate was observed as the P2O5 content in slag increased. In addition, a higher Al/Si atomic ratio was measured in the C-S(A)-H gel phase formed in the cement matrix. However, similar Ca/Si atomic ratio of C-S(A)-H gel phase and Mg/Al atomic ratio of hydrotalcite-like phase were determined in all slag pastes, irrespective of the addition of P2O5. In contrast to magnesium ion which was retained within the original slag boundary, phosphorus ions could migrate into cement matrix. Therefore, P/Si atomic ratio of the C-S-H gel phase increased with the increasing phosphorus oxide content in slag, reaching up to ∼0.08.

Original languageEnglish
Article number131140
Number of pages11
JournalConstruction and Building Materials
Volume377
DOIs
Publication statusPublished - 2023

Keywords

  • Cement-slag system
  • Hydration products
  • PO
  • Synthetic slag

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