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Open AccessArticle

Influence of Titanium Dioxide Nanoparticles on the Sulfate Attack upon Ordinary Portland Cement and Slag-Blended Mortars

Department of Civil and Environmental Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
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Author to whom correspondence should be addressed.
Materials 2018, 11(3), 356; https://doi.org/10.3390/ma11030356
Received: 30 January 2018 / Revised: 24 February 2018 / Accepted: 27 February 2018 / Published: 28 February 2018
(This article belongs to the Special Issue Application of Photoactive Nanomaterials in Degradation of Pollutants)
In this study, the effects of titanium dioxide (TiO2) nanoparticles on the sulfate attack resistance of ordinary Portland cement (OPC) and slag-blended mortars were investigated. OPC and slag-blended mortars (OPC:Slag = 50:50) were made with water to binder ratio of 0.4 and a binder to sand ratio of 1:3. TiO2 was added as an admixture as 0%, 3%, 6%, 9% and 12% of the binder weight. Mortar specimens were exposed to an accelerated sulfate attack environment. Expansion, changes in mass and surface microhardness were measured. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC) tests were conducted. The formation of ettringite and gypsum crystals after the sulfate attack were detected. Both these products had caused crystallization pressure in the microstructure of mortars and deteriorated the mortars. Our results show that the addition of nano-TiO2 accelerated expansion, variation in mass, loss of surface microhardness and widened cracks in OPC and slag-blended mortars. Nano-TiO2 containing slag-blended mortars were more resistant to sulfate attack than nano-TiO2 containing OPC mortars. Because nano-TiO2 reduced the size of coarse pores, so it increased crystallization pressure due to the formation of ettringite and gypsum thus led to more damage under sulfate attack. View Full-Text
Keywords: titanium dioxide; nanoparticles; photocatalysis; sulfate attack; mortar; cement; blast furnace slag; expansion; deterioration; microcracks titanium dioxide; nanoparticles; photocatalysis; sulfate attack; mortar; cement; blast furnace slag; expansion; deterioration; microcracks
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Atta-ur-Rehman; Qudoos, A.; Kim, H.G.; Ryou, J.-S. Influence of Titanium Dioxide Nanoparticles on the Sulfate Attack upon Ordinary Portland Cement and Slag-Blended Mortars. Materials 2018, 11, 356.

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