摘要
为了研究混杂纤维喷射混凝土的弯曲韧性，采用不同掺量的钢纤维和聚丙烯纤维混杂以及高炉微粉复合超叠加的方法制备600mm×600mm×100mm混杂纤维喷射混凝土方板并置于刚性支撑架上，选用等位移控制对方板进行中心加载。通过生成的荷载挠度曲线及对其进行积分所得的能量吸收值综合评价各组方板的弯曲韧性，同时，通过破坏过程评价各板裂缝控制能力。试验结果表明：掺入1.2％钢纤维和0.11％聚丙烯纤维的喷射板试件的弯曲韧性优于掺入0.8％钢纤维和0.11％聚丙烯纤维的喷射板，其最大峰值荷载提高了18％，板中心挠度至25 m m时的能量吸收值也提高了25.6％；对于仅掺入0.8％单一钢纤维的板，混杂了0.11％聚丙烯纤维后，两种纤维间的正混杂效应使得板中心挠度至25 m m时的能量吸收值提高了28.5％；高炉微粉掺量的增加能提高混杂纤维喷射混凝土板的弯曲韧性；混杂纤维喷射混凝土板均展现出了良好的裂缝控制能力，板整体呈现裂而不断的延性破坏。
Abstract
The flexural toughness of hybrid fiber reinforced shotcrete was studied with hybrid fiber including different contents of steel fiber ,polypropylene fiber and blast furnace powder super composite were used to reinforce in cemetition matrix .600 mm × 600 mm × 100 mm hybrid fiber reinforced shotcrete panels were adopted and placed on the rigid support frame and the equal displacement was used to control the load on the center of panels . The load‐deflection curves and the energy absorption value were used to comprehensively evaluate the flexural toughness of each group ,and by analyzing the process of the panels failure the ability of the panels to limit the cracks could be assessed .The results showed that ,the jet panels with 0 .8% steel fiber and 0 .11% polypropylene fiber showed better flexural toughness than the jet panels with 1 .2% steel fiber and 0 .11% polypropylene fiber ,and the peak load increased by 18% and the energy absorption increased by 25 .6% when the the deflection was 25 mm .When jet panels with 0 .8% steel fiber mixed with 0 .11% polypropylene fiber ,the energy absorption increased by 28 .5% because of the positive synergy effect of steel and polypropylene fiber .The flexural toughness of hybrid fiber reinforced shotcrete panels were reinforced and toughed with more blast furnace powder .All of the hybrid fiber reinforced shotcrete panels showed great ability to limit the cracks ,and the whole of panels where the cracks appeared but not ran through presented ductile failure .
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维普
万方数据