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- Title
纳米 TiO<sub>2</sub> 改性水泥基混凝土复合材料的制备及性能研究.
- Authors
师 杰; 沈子杨
- Abstract
Using nano-TiO2 as filler, by adjusting the doping ratio of nano-TiO2 (0, 2 wt%, 4 wt% and 6 wt%), nano-TiO2 modified cement-based concrete composites with different content were prepared. The mechanical properties, micro morphology and durability of concrete composites were analyzed. The results showed that with the increase of nano-TiO2 doping content, the compressive strength and flexural strength of concrete composites first increased and then decreased, and the porosity and wear amount first decreased and then slightly increased. When the doping content of nano-TiO2 was 4 wt%, the compressive strength and flexural strength reached the maximum at 28 d, which were 42.57 and 5.62 MPa respectively, the minimum porosity was 9.57%, the minimum wear amount was 1.81 kg/m², and the maximum wear reduction rate was 42.54%. The test of salt freezing resistance showed that after 7 freeze-thaw cycles, with the increase of nano-TiO2 doping content, the mass loss rate continues to decreasing and the salt freezing resistance was significantly improved. SEM analysis showed that the morphology of ettringite changed from needle like to oblate shape after adding appropriate amount of nano TiO2, which promoted the formation of gelatin and enhanced the compactness of the whole structure, thus improving the mechanical properties of the concrete composite. Comprehensive analysis shows that the optimal doping ratio of nano-TiO2 was 4 wt%.
- Publication
Journal of Functional Materials / Gongneng Cailiao, 2022, Vol 53, Issue 6, p06100
- ISSN
1001-9731
- Publication type
Academic Journal
- DOI
10.3969/ji.ssn.1001-9731.2022.06.014