Abstract
The study of white cement-based mortar mixtures prepared according to ASTM C-109 with self-cleaning and heterogeneous photocatalytic properties after seven days of curing, prepared by mixing white cement 30 CPC 30 RB, water, and silica, is presented here. To achieve the self-cleaning property, titanium dioxide TiO2 P25 with a crystal structure of anatase and rutile (80:20) and particle size of 20 nm were added by weight proportion of 0.5, 1, 3.0, and 5.0%. X-ray diffraction and scanning electron microscopy coupled with structural characterization revealed that the material which presents the highest degree of cleanliness was the one containing 5% TiO2 because the presence of the photocatalyst gives a stronger self-cleaning property to the cement-based material, achieving a 26% degradation of Rhodamine B after 8 h of sun exposure. In addition, it was found that the cement containing TiO2 presented a compressive strength 8–12% lower than the reference material without TiO2. The thermal expansion coefficient of the specimens was 7.4 × 10–6 K−1. It is concluded that itis possible to obtain self-cleaning cement-based materials without affecting their physical–mechanical properties and maintain the expansion coefficient.
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Acknowledgements
Partial financial supports from CONACYT- Ciencia Básica No. 168730, PAICYT 2013 de la UANL CLAVE IT1077-11 and PIFI 2013, CONACYT (Mexican National Council of Science and Technology) and Campus France México are acknowledged. A very special thanks to the staff of Departamento de Eco-materiales y Energía from Universidad Autónoma de Nuevo León (UANL) in México for their help, especially to Dra. Leticia Torres Guerra, Dra. Elvira Zarazúa Morín and Dr. Daniel Sanchez Martínez.
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Conceptualization was performed by IJR; methodology was done by ORV and IR; formal analysis and investigation were presented by ORV; writing—original draft preparation was revised by ORV; writing—review and editing were prepared by NDSEIL, MHR, JVR, MSA, and AM; funding acquisition was approved by IR; supervision was conducted by IJR and ND.
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Rodriguez-Villarreal, O., Ramírez, I.J., Rivera, M.H. et al. Effects of the use of TiO2 on the early ages of white cement-based mortars: analysis of chemical, physical, mechanical, and photocatalytic properties. Chem. Pap. (2024). https://doi.org/10.1007/s11696-024-03382-w
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DOI: https://doi.org/10.1007/s11696-024-03382-w