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首页> 美国卫生研究院文献>Materials >Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles
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Durability of Steel Fiber-Reinforced Concrete Containing SiO2 Nano-Particles

机译：含SiO2纳米颗粒的钢纤维增强混凝土的耐久性

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An experimental study was conducted to investigate the effect ofnano-SiO2 and steel fiber content on the durability of concrete. Five different dosages of nano-SiO2 particles and five volume dosages of steel fiber were used. The durability of concretes includes permeability resistance, cracking resistance, carbonation resistance, and freezing-thawing resistance, and these were evaluated by the water permeation depth, number of cracks, total cracking area per unit area of the specimens, carbonation depth of the specimens, and the relative dynamic elastic modulus of the specimens after freezing-thawing cycles, respectively. The results indicate that the addition of nano-SiO2 particles significantly improves the durability of concrete when the content of nano-SiO2 is limited within a certain range. With the increase of nano-SiO2 content, the durability of concrete first increases and then decreases. An excessive number of nano-SiO2 particles could have an adverse effect on the durability of the concrete. The addition of the correct amount of steel fibers improves the carbonation resistance of concrete containing nano-particles, but excessive steel fiber reduces the carbonation resistance. Moreover, the addition of steel fibers reduces the permeability resistance of concrete containing nano-particles. The incorporation of steel fiber enhanced the freezing-thawing resistance and cracking resistance of concrete containing nano-particles. With increasing steel fiber content, the freezing-thawing resistance of the concrete containing nano-particles increases, and the cracking resistance of the concrete decreases gradually.
机译：进行了实验研究，以研究纳米SiO2和钢纤维含量对混凝土耐久性的影响。使用五种不同剂量的纳米SiO2颗粒和五种体积剂量的钢纤维。混凝土的耐久性包括抗渗透性，抗裂性，抗碳化性和抗冻融性，并通过透水深度，裂缝数，试样单位面积的总裂缝面积，试样的碳化深度，冻融循环后样品的相对动态弹性模量。结果表明，当将纳米SiO 2的含量限制在一定范围内时，纳米SiO 2颗粒的添加显着提高了混凝土的耐久性。随着纳米SiO 2含量的增加，混凝土的耐久性首先增加然后降低。过量的纳米SiO2颗粒可能对混凝土的耐久性产生不利影响。添加适量的钢纤维可改善含有纳米颗粒的混凝土的抗碳化性，但过量的钢纤维则会降低抗碳化性。此外，钢纤维的添加降低了包含纳米颗粒的混凝土的抗渗透性。钢纤维的掺入增强了含纳米颗粒的混凝土的抗冻融性和抗裂性。随着钢纤维含量的增加，含纳米颗粒的混凝土的抗冻融性增加，而混凝土的抗裂性逐渐降低。

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