纳米二氧化钛颗粒对混凝土力学特性的影响

徐超; 陈有亮; 杜曦

doi:10.13204/j.gyjzG20062604

纳米二氧化钛颗粒对混凝土力学特性的影响

doi: 10.13204/j.gyjzG20062604

上海理工大学环境与建筑学院, 上海 200093

基金项目:

国家自然科学基金项目（10872133）；上海市软科学研究领域重点项目（18692106100）。

详细信息

作者简介:
徐超,男,1991年出生,博士。

通讯作者:
陈有亮,chenyouliang2001@163.com。

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- 文章访问数: 83
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-26
- 网络出版日期: 2021-08-19

EFFECT OF NANO-TIO₂ PARTICLES ON MECHANICAL PROPERTIES OF CONCRETE

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

摘要

摘要: 研究了纳米二氧化钛（TiO₂）颗粒对混凝土抗压、抗拉及冻融耐久性的影响，并利用颗粒流PFC 2D （Particle Flow Code， Two-dimensional）对普通混凝土与纳米颗粒改性混凝土进行常温下抗压和抗拉模拟。结果表明：纳米TiO₂颗粒能够改善混凝土的致密性，常温下3%掺量的纳米颗粒对其抗压性提高最明显，其相对普通混凝土抗压强度提高了20.18%；纳米颗粒对混凝土的抗拉性能基本无影响，但对混凝土的冻融性有很大的提高，100次冻融循环后其相对普通混凝土抗冻性提高了136.8%。PFC 2D能良好地模拟普通混凝土及纳米颗粒改性混凝土的抗压和抗拉力学特性，由于混凝土的离散型，模拟与试验应力应变趋势上有微小的差异，但能较准确反应其峰值应力和应变。
- 纳米改性混凝土 /
- 抗压性能 /
- 抗拉性能 /
- 冻融耐久性
Abstract: The effect of nano-TiO₂ particles on the compressive, tensile and freeze-thaw durability of concrete was studied, and the normal concrete and the nano-TiO₂ concrete were simulated at room temperature by PFC 2D. The results showed that the nano-TiO₂ particles could improve the compactness of concrete, at room temperature, 3% nano-TiO₂ particles had the most improvement in concrete compressive strength, which was 20.18% higher than normal concrete. The tensile performance of nano-TiO₂ concrete was unchanged, but the freeze-thaw resistance of nano-TiO₂ concrete had been greatly improved. After being subjected to 100 freeze-thaw cycles, its freeze resistance increased by 136.8% compared to normal concrete. PFC 2D could well simulate the compressive and tensile mechanical properties of normal concrete and nano-particle modified concrete. Due to the discreteness of concrete, there was a slight difference between the simulated and experimental stress and strain trends, but it could accurately reflect its peak stress and strain.
- nano-TiO₂ concrete /
- compressive performance /
- tensile performance /
- freeze-thaw durability

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参考文献(12)

[1]	ZAHIRI F, ESKANDARI-NADDAF H. Optimizing the Compressive Strength of Concrete Containing Micro-Silica, Nano-Silica, and Polypropylene Fibers Using Extreme Vertices Mixture Design[J]. Frontiers of Structural & Civil Engineering, 2019, 4:821-830.
[2]	CAMILETTI J, SOLIMAN A M, NEHDI M L. Effects of Nano and Micro-Limestone Addition on Early-Age Properties of Ultra-High-Performance Concrete[J]. Materials and structures, 2013, 46(6):881-898.
[3]	QUERCIA G, HVSKEN G, BROUWERS H J H. Water Demand of Amorphous Nano Silica and Its Impact on the Workability of Cement Paste[J]. Cement & Concrete Research, 2012, 42(2):344-357.
[4]	韩学强, 詹树林, 徐强,等. 干湿循环作用对混凝土抗氯离子渗透侵蚀性能的影响[J]. 复合材料学报,2020,37(1):198-204.
[5]	高丹盈, 赵亮平, 陈刚. 高温中纤维纳米混凝土单轴受压应力-应变关系[J]. 土木工程学报,2017,50(9):46-58.
[6]	LEE B Y, KURTIS K E. Influence of TiO₂ Nanoparticles on Early C₃S Hydration[J]. Journal of the American Ceramic Society, 2010, 93(10):3399-3405.
[7]	徐迅, 卢忠远. 纳米二氧化硅对硅酸盐水泥水化硬化的影响[J]. 硅酸盐学报,2007,35(4):478-484.
[8]	应姗姗. 加气混凝土的纳米碳酸钙改性及高铝质加气混凝土的制备[D]. 杭州:浙江大学,2014.
[9]	ZELIĆ J, RUŠIĆ D, VEZA D, et al. The Role of Silica Fume in the Kinetics and Mechanisms During the Early Stage of Cement Hydration Cem Concr Res, 2000, 30(10):1655-1662.
[10]	CHAIPANICH A, NOCHAIYA T, WONGKEO W, et al. Compressive Strength and Microstructure of Carbon Nanotubes-Fly Ash Cement Composites[J]. Materials Science & Engineering A, 2010, 527(4/5):1063-1067.
[11]	KACHANOV V K, SOKOLOV I V, KONTSOV R V, et al. Ultrasonic Wave Velocity Measurement in Concrete Using the Impact-Echo Method[J]. Insight, 2019, 61(1):15-19.
[12]	Itasca Consulting Group. PFC 2D Users' Manual[M].Minnersota:Inc.,2017.