Effects of soft water attack on Portland and natural zeolite blended cements

Translated title of the contribution: Effects of soft water attack on Portland and natural zeolite blended cements

Tiana Milović, Ognjen Rudić, Saeeda Omran Furgan, Miroslava Radeka*, Mirjana Malešev, Vlastimir Radonjanin, Sebastian Baloš, Mirjana Laban

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The durability of concrete infrastructure is related to the properties of the applied concrete and the effects of the aggressive external environment on it. When concrete is directly exposed to soft water, the leaching of calcium ions from hardened cement or cement-based pastes occurs, causing reduction in strength and further deterioration of the concrete structure. This paper pre-sents the experimental results of soft water attack effects on phase composition and compressive strength of blended cement pastes, when cement is replaced with 0, 10, 20 and 30% of natural zeolite. In order to simulate soft water attack in laboratory conditions, paste specimens were exposed to leaching in deionised water up to 180 days. The evaluation of the changes in phase composition (ettringite, portlandite, calcium silicate hydrate gel) due to calcium ion leaching was made based on X-ray diffraction analysis, Fourier-transform infrared spectroscopy and paste compressive strength tests. The presence of portlandite and ettringite after 180 days of exposure to deionised water indicates that leaching did not influence the stability of the hydration products in blended cement pastes. Moreover, blended cement paste with 10% of natural zeolite had a higher compressive strength than the reference one.

Translated title of the contributionEffects of soft water attack on Portland and natural zeolite blended cements
Original languageSerbian
Pages (from-to)403-415
Number of pages13
JournalChemical Industry & Chemical Engineering Quarterly
Volume27
Issue number4
DOIs
Publication statusPublished - 2021

Keywords

  • Ca-clinoptilolite
  • Compressive strength
  • Deionised water
  • FTIR spectroscopy
  • Leaching
  • XRD analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)

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