ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 61, (4) 301 - 308 (2017)

Wang Han 1,2, Zhao Piqi 1,2, Lu Lingchao 2, 1, Wang Shoude 2, 1, Xin Cheng 2 , 1
1 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials (University of Jinan), Shandong 250022, China
2 School of Material Science and Engineering, University of Jinan, Shandong 250022, China

Keywords: Nano-TiO₂, Sulphoaluminate cement, Hydration, Photo-degration

Nano-TiO ₂ and sulphoaluminate cement have been received sustained attention due to their environment-friendly characteristic, respectively. Particular attention was paid to their materials composite. To better understand the effect of nano-TiO ₂ on sulphoaluminate cement hydration and its application in photo-degradation, the composite systems of cement paste (mortar) with well-dispersed nano-TiO ₂ were investigated by mechanical analysis, Rietveld/XRD, SEM, porosity analysis and photocatalytic test. The results reveal that nano-TiO ₂ can be well dispersed under ultrasonic treatment of 15min when the sodium hexametaphosphat is chosen as the dispersant. And the well-dispersed nano-TiO ₂, with the dosage of 0.2wt%, has the most significant effect on the mechanical improvement. Micro-analysis show that the mechanical promotion by nano-TiO ₂ is not attributed to the hydration degree increase but microstructure optimization. It is reflected in the decrease of porosity, mainly affecting the transitional pores (D=10~100nm), and spatial structures modification of cement paste where AFt was more likely to form as needle shape with shorter length-diameter ratio. The photocatalytic test demonstrates that the composite system (cement paste) has long-term effective photo-degradation property.

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doi: 10.13168/cs.2017.0029
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