Exploring synergistic effects and hydration mechanisms in metakaolin-blended cement system with varying metakaolin and wollastonite content

Xinyu Zhang, Yin Bai, Qi Luo*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

The quest for sustainable construction practices has led to a growing interest in reducing cement consumption, with supplementary cementitious materials emerging as a promising solution. While reactive admixtures have been extensively studied, there is a noticeable research gap regarding inert admixtures, a critical component of cementitious systems. This paper introduces a novel metakaolin-blended cement system, optimizing the metakaolin, wollastonite, and ground quartz ratios to enhance microstructure and performance. Within this complex quaternary system, we conduct a comprehensive investigation, including assessments of compressive strength, setting times, heat release during hydration, R3 test. Furthermore, we explore hydration products and microstructure through thermogravimetric analysis, X-ray diffraction, backscattered electron imaging, and mercury intrusion porosimetry. The results indicate the influence of wollastonite on clinker reactions and hydration. Although wollastonite slightly increases meso-scale pores, its fibrous shape enhances the overall microstructure. Substituting 50% of metakaolin with wollastonite not only enhances the pozzolanic reactivity but also leads to improved long-term strength. Moreover, the synergistic effect of wollastonite and metakaolin allows for precise tailoring setting times and modulate hydration kinetics, thereby enhancing the overall performance of the cementitious system.

Original languageEnglish
Article number135962
JournalConstruction and Building Materials
Volume425
ISSN0950-0618
DOIs
Publication statusPublished - Apr 2024

Keywords

  • Hydration products
  • Mechanical property
  • Metakaolin
  • Pozzolanic reaction
  • Wollastonite

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