冲击荷载下油菜秸秆灰分混凝土的动态力学性质
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湖南省政府重大专项(湘府阅[2014]35号);湖南省教育厅青年基金项目(15B108)


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    摘要:

    运用直径80 mm分离式霍普金森压杆试验设备,研究油菜秸秆灰分掺量分别为10%、15%、20%、25%的混凝土在0.30、0.45、0.65 MPa冲击加载气压下的动态力学性质。结果表明:油菜秸秆灰分混凝土的应变率与试件加载气压呈正相关关系;峰值应力随加载气压的提高而增大,油菜秸秆灰分掺量为10%的混凝土在不同加载气压下的峰值应力变化率最大,其变化率高达63.63%;在同一加载气压下,油菜秸秆灰分混凝土峰值应力随灰分掺量的增加而减小;相比对照混凝土峰值应力,10%掺量混凝土最大,其峰值应力大于对照混凝土,而其他掺量油菜秸秆灰分混凝土峰值应力均低于对照混凝土,油菜秸秆灰分掺量10%的混凝土的动态承载力最优。

    Abstract:

    The dynamic mechanical properties of concrete doped with 10%, 15%, 20% and 25% percentage rape straw ash were studied by using the Φ80 mm split Hopkinson pressure bar test equipment under 0.3,0.45, and 0.65 MPa impact load. The results indicated that the strain rate of rape straw ash doped concrete was positively correlated with the loading pressure. The peak stress increased with an increase in the loading pressure. The highest change rate of peak stress was achieved to be 63.63% for the concrete doped with 10% percentage rape straw ash under different impact load. Under the same impact load, the peak stress of rape straw ash doped concrete decreased with the increase of the content of rape straw ash. Compared with the peak stress of the controlled concrete, only the concrete doped with 10% percentage rape straw ash was higher thanit. It is found that the dynamic bearing capacity of concrete was the best for the concrete doped with the10% percentage rape straw ash.

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齐臻,刘保华,易恋,曾哲,周雲.冲击荷载下油菜秸秆灰分混凝土的动态力学性质[J].湖南农业大学学报:自然科学版,2017,43(3):.

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  • 在线发布日期: 2017-06-07
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