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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Effect of silica fume on fracture properties of high-performance concrete containing fly ash
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Effect of silica fume on fracture properties of high-performance concrete containing fly ash

机译：硅粉对粉煤灰高性能混凝土断裂性能的影响

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摘要

A parametric experimental study has been conducted to investigate the effect of silica fume on the fracture properties of high-performance concrete containing fly ash, with four silica fume contents (3%, 6%, 9% and 12%) used. By means of three-point bending method, the fracture toughness, fracture energy, effective crack length, critical crack opening displacement and maximum crack opening displacement of the specimen were measured, respectively. The results indicate that silica fume has great adverse effect on the fracture toughness, fracture energy, effective crack length, critical crack opening displacement and maximum crack opening displacement, and these fracture parameters decrease gradually when the content of silica fume increases from 3% to 12%. Besides, as the silica fume content increases from 3% to 12%, the relational curves between the vertical load and the mid-span deflection (Pv-δ), crack mouth opening displacement (Pv-CMOD) and crack tip opening displacement (Pv-CTOD) are becoming thinner and thinner, which indicates that the capability of high-performance concrete containing fly ash to resist crack propagation is becoming weaker and weaker. It seems that the content of silica fume of high-performance concrete containing fly ash should be controlled strictly, and the silica fume content should be as low as possible on condition that the other properties of high-performance concrete can meet practical requirements.
机译：进行了一项参数化实验研究，以研究硅粉对含粉煤灰的高性能混凝土的断裂性能的影响，其中使用了四种硅粉含量（3％，6％，9％和12％）。采用三点弯曲法分别测量了试样的断裂韧性，断裂能，有效裂纹长度，临界裂纹开口位移和最大裂纹开口位移。结果表明，硅粉对断裂韧性，断裂能，有效裂纹长度，临界开裂位移和最大开裂位移有很大的不利影响，当硅粉含量从3％增加到12时，这些断裂参数逐渐降低。 ％。此外，随着硅粉含量从3％增加到12％，垂直载荷与中跨挠度（Pv-δ），裂纹口张开位移（Pv-CMOD）和裂纹尖端张开位移（Pv）之间的关系曲线-CTOD）越来越薄，这表明含粉煤灰的高性能混凝土抵抗裂纹扩展的能力越来越弱。似乎应该严格控制含有粉煤灰的高性能混凝土的硅灰含量，并且在高性能混凝土的其他性能可以满足实际要求的情况下，硅灰含量应尽可能低。

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