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首页> 美国卫生研究院文献>Heliyon >Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber
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Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

机译：微钢纤维增强自密实混凝土的反复落锤冲击试验

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摘要

Steel fiber has become a proven material that can significantly alter the behavior of different types of concrete mixtures from brittle to more ductile ones. Rich literature is currently available on the mechanical properties of steel fiber-reinforced self-compacting concrete. However, the investigation of the impact resistance of this material to drop weight is still required to enrich the knowledge about its behavior under different loading conditions. An experimental work was conducted in this research to evaluate the performance of steel fiber-reinforced self-compacting concrete under repeated impact loading using the repeated blows test recommended by ACI 544-2R. The tests investigated the effect of drop weight and drop height in addition to fiber content. Straight micro-steel fibers were incorporated in three volumetric contents of 0.5, 0.75 and 1.0% and were compared with a similar plain mixture. The test equipment was adjusted to conduct repeated impact loading from different drop-heights and using different drop-weights. The adopted drop-heights were 450, 575 and 700 mm, while the adopted drop-weights were 4.5, 6.0 and 7.5 kg. The combination of the adopted drop-heights and weights composes four loading cases in addition to the standard loading case with a drop-weight and drop-height of 4.5 kg and 450 mm. The inclusion of micro steel fiber was found to significantly increase the impact resistance of self-compacting concrete with percentage developments ranging from 150 to 860% compared to plain samples. The specimens tested under 4.5 kg and 450 mm drop weight and height exhibited the highest percentage improvement in impact resistance among the five loading cases. The results also showed that the impact ductility of fibrous specimens was up to 24% higher than that of plain specimens.
机译：钢纤维已成为一种行之有效的材料，可以显着改变各种类型的混凝土混合物的性能，从脆性变为韧性更好。目前，关于钢纤维增强自密实混凝土的机械性能的文献很多。但是，仍然需要研究这种材料对重量的抗冲击性，以丰富有关在不同负载条件下其性能的知识。在这项研究中进行了一项实验工作，使用ACI 544-2R推荐的反复打击试验评估了钢纤维增强自密实混凝土在反复冲击载荷下的性能。该测试研究了除纤维含量外，落纱重量和落纱高度的影响。将直的微钢纤维以0.5、0.75和1.0％的三种体积含量掺入，并与类似的普通混合物进行比较。调节测试设备以从不同的落差高度和使用不同的落差重量进行重复的冲击载荷。采用的落差为450、575和700毫米，而采用的落差为4.5、6.0和7.5千克。除标准装载工况外，所采用的下降高度和重量的组合还构成了四个装载工况，标准装载工况的下降重量和下降高度分别为4.5 kg和450 mm。与普通样品相比，发现微钢纤维的加入显着提高了自密实混凝土的抗冲击性，其发展百分率在150％至860％之间。在4.5千克和450毫米下落重量和高度下进行测试的样品在五个载荷情况下表现出最高的抗冲击性提高百分比。结果还表明，纤维试样的冲击延展性比普通试样高24％。

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