Insights into the positive effects of power ultrasound on the pore solution of Portland cement pastes

Ahmad Ehsani, Eshmaiel Ganjian, Timothy J. Mason, Mark Tyrer, Mark Bateman

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The influence of the direct application of power ultrasound (PUS) at several frequencies and power densities to Portland cement (PC) pastes is investigated in detail. Two PC pastes at water-to-cement ratios of 0.50 and 0.80 were studied. The composition of the pore solution and hydrates after introducing PUS irradiation for various periods were examined using ICP-OES, X-ray diffraction (XRD) and thermogravimetric analysis (TGA) techniques. The results indicate for the first time that applied PUS used in this study, can disturb the early formation of ettringite whilst appreciably promoting the formation of amorphous aluminium hydroxide hydrate by considerably releasing the aluminium ions into the pore solution. Moreover, PUS can increase carbonates by intensifying the carbonation in the PC systems particularly the system with higher water content. The present research concludes that ultrasound could be a promising technique to enhance ternesite hydration in ternesite-rich belitic calcium sulphoaluminate cements.
Original languageEnglish
Article number104302
JournalCement and Concrete Composites
Volume125
Early online date14 Oct 2021
DOIs
Publication statusPublished - Jan 2022

Bibliographical note

Funding Information:
This study was performed during the first author's PhD programme supported by Coventry University . The authors wish to acknowledge the support of the Henry Royce Institute for A. Ehsani through the Royce PhD Equipment Access Scheme enabling access to STA and XRD facilities at Royce@Imperial; EPSRC Grant Number EP/R00661X/1. In addition, the authors are grateful to Ms Raluca Barza, Mr Daniel Dugdale, the staff at Analytical Laboratory, Coventry University, for assistance with the ICP-OES measurements. We also thank Mr Paul Rounce (Hanson Cement, UK) for providing fresh cement for this study.

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Carbonation
  • ICP-OES
  • Pore solution
  • Portland cement paste
  • Power ultrasound
  • Ternesite hydration

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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