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EFFECT OF NANO-TIO2 PARTICLES ON MECHANICAL PROPERTIES OF CONCRETE
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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。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.
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1. 乔伟毅，贾青，王正君，唐宁，高家玮. 纳米材料对混凝土力学性能的影响研究. 江苏建材. 2024(01): 9-11 . 
百度学术2. 刘先南，王珂，李学军. 双掺纳米二氧化钛和秸秆灰对混凝土力学及微观特性试验研究. 混凝土. 2023(06): 125-129+133 . 百度学术3. 陈正伟，许桂霞. 冻融循环和盐卤侵蚀作用下复掺纳米混凝土的损伤模型. 材料导报. 2023(S2): 262-267 . 百度学术4. 王磊，王元帅，赵燕茹，张建新，白建文. 纳米TiO_2混凝土抗压强度及孔结构试验研究. 内蒙古工业大学学报(自然科学版). 2022(06): 549-555 . 百度学术5. 石晓亮，韦京利，张黎昕，谢吉程，陈正. 纳米水泥基材料的抗压强度多因素计算模型. 广西大学学报(自然科学版). 2022(06): 1424-1433 . 百度学术6. 刘中坤，王正君，吴昊，陈茜，叶昆河. 防冻剂和纳米材料对负温条件混凝土的影响. 广东建材. 2021(08): 63-65+13 . 百度学术其他类型引用(8)
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