为提高再生混凝土的力学性能，以玄武岩纤维和纳米氧化硅为增强材料对再生混凝土进行改良，形成玄武岩纤维与纳米氧化硅复合改性再生混凝土，通过静态抗压性能试验及分离式霍普金森压杆试验，研究了玄武岩纤维与纳米氧化硅对改性再生混凝土破坏形态及静动态抗压强度的影响。研究表明，随应变率增大，破坏形态由完整经破裂向粉碎过渡，动态抗压强度、动态增强因子、比能量吸收均呈增大趋势；取代率对试块破坏状态、动态抗压强度及比能量吸收不产生规律性影响，但静态抗压强度随取代率的增大而降低；玄武岩纤维有利于增强试块破坏时的整体性，提高了再生混凝土静态抗压强度、动态抗压强度、峰值应变及比能量吸收；纳米氧化硅有利于提高再生混凝土的静态抗压强度、动态抗压强度、峰值应变及比能量吸收。结果表明，玄武岩纤维与纳米氧化硅对再生混凝土的静动态力学性能及耗能性能具有较好的增强作用。
Abstract
In order to improve the mechanical properties of recycled concrete, basalt fiber and nano-silica are used as the reinforcing materials to improve the recycled concrete to form the composite modified recycled concrete. Through static compressive strength test and split Hopkinson pressure bar test, the influence of basalt fiber and nano-silica on the destruction form and compressive strength of recycled concrete. The results show that, as the strain rate increases, the destruction form transitions from fracture to crushing, and the dynamic compressive strength, dynamic increase factor, and specific energy absorption all increase. The replacement rate has no regular effect on the destruction form, dynamic compressive strength, peak strain and specific energy absorption, but the static compressive strength decreases with the increase of the replacement rate. Basalt fiber is conducive to enhancing the integrity of the specimen during failure, and improves the static compressive strength, dynamic compressive strength, peak strain and specific energy absorption of the recycled concrete. Nano-silica can improve the static compressive strength, dynamic compressive strength, peak strain and specific energy absorption of the recycled concrete. Studies have shown that basalt fiber and nano-silica have a good reinforcement effect on the mechanical properties and energy dissipation of recycled concrete.
关键词
玄武岩纤维 /
纳米氧化硅 /
再生混凝土 /
霍普金森压杆 /
动态抗压强度
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Key words
basalt fiber /
nano-silica /
recycled concrete /
split Hopkinson pressure bar /
dynamic compressive strength
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