Effect of leaching on the hardened, microstructural and self-cleaning characteristics of titanium dioxide containing cement mortars

Atta-ur-Rehman, Jun Hyeong Kim, Hong Gi Kim, Abdul Qudoos, Jaesuk Ryou

Research output: Contribution to journalArticle

Abstract

In this study, the effect of leaching attack on titanium dioxide (TiO 2 ) containing photocatalytic cement mortars was investigated. Changes in the mechanical, microstructure, and photocatalytic properties of the mortars were studied with the leaching attack. The photocatalytic mortars were made with ordinary Portland cement as binder. TiO 2 was added at 0%, 1.5%, 3%, 4.5%, and 6% of the binder weight. After curing for 90 days in saturated limewater, the mortars were immersed in 6 M ammonium nitrate (NH 4 NO 3 ) solution for 140 days. The leaching depth, loss of compressive and flexural strengths, changes in porosity, and ultrasonic pulse velocity (UPV) were measured. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) tests were conducted to investigate the microstructural damages. The effects of leaching on the photocatalytic performance were evaluated by observing rhodamine B discoloration on the controlled and leached mortars. Experimental results showed that the addition of TiO 2 increased the resistance of the mortars to the leaching attack. The loss of hardened properties and microstructural changes were reduced with the addition of TiO 2 . The leached mortars showed photocatalytic activity after exposure to ultraviolet light, however, self-cleaning was slightly reduced after the leaching attack.

Original languageEnglish
Pages (from-to)640-650
Number of pages11
JournalConstruction and Building Materials
Volume207
DOIs
StatePublished - 2019 May 20

Fingerprint

Mortar
Titanium dioxide
Leaching
Cleaning
Cements
rhodamine B
Binders
Discoloration
Portland cement
titanium dioxide
Bending strength
Compressive strength
Fourier transform infrared spectroscopy
Curing
Thermogravimetric analysis
Differential scanning calorimetry
Nitrates
Porosity
Ultrasonics
X ray diffraction

Keywords

  • Cement mortar
  • Durability
  • Leaching
  • Mechanical properties
  • Nanoparticles
  • Photocatalysis
  • Self-cleaning
  • Titanium dioxide

Cite this

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abstract = "In this study, the effect of leaching attack on titanium dioxide (TiO 2 ) containing photocatalytic cement mortars was investigated. Changes in the mechanical, microstructure, and photocatalytic properties of the mortars were studied with the leaching attack. The photocatalytic mortars were made with ordinary Portland cement as binder. TiO 2 was added at 0{\%}, 1.5{\%}, 3{\%}, 4.5{\%}, and 6{\%} of the binder weight. After curing for 90 days in saturated limewater, the mortars were immersed in 6 M ammonium nitrate (NH 4 NO 3 ) solution for 140 days. The leaching depth, loss of compressive and flexural strengths, changes in porosity, and ultrasonic pulse velocity (UPV) were measured. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) tests were conducted to investigate the microstructural damages. The effects of leaching on the photocatalytic performance were evaluated by observing rhodamine B discoloration on the controlled and leached mortars. Experimental results showed that the addition of TiO 2 increased the resistance of the mortars to the leaching attack. The loss of hardened properties and microstructural changes were reduced with the addition of TiO 2 . The leached mortars showed photocatalytic activity after exposure to ultraviolet light, however, self-cleaning was slightly reduced after the leaching attack.",
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Effect of leaching on the hardened, microstructural and self-cleaning characteristics of titanium dioxide containing cement mortars. / Atta-ur-Rehman; Kim, Jun Hyeong; Kim, Hong Gi; Qudoos, Abdul; Ryou, Jaesuk.

In: Construction and Building Materials, Vol. 207, 20.05.2019, p. 640-650.

Research output: Contribution to journalArticle

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AU - Ryou, Jaesuk

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