Among fiber-reinforced composites, steel fiber has been widely-used for concrete infrastructure such as silos, tunnels, specifically aiming at reducing the weight of concrete and enhancing its strength by overcoming the brittleness. However, there is still little known about appropriate quality management and applicability assessment for steel fiber composites. This study fills this knowledge gap by testing the possibility of maintenance through steel fiber concrete thickness estimation and assessing the applicability of the quality management instrument. To this end, this study utilizes two different stress wave-driven non-destructive test methods: ultrasonic pulse velocity and impact-echo methods. The ultrasonic pulse velocity method was employed to estimate the compressive strength of steel fiber reinforced concrete, while the impact-echo method was applied to estimate the thickness of various steel fiber reinforced concrete members. As a quality management factor of concrete, correlations between steel fiber mixing ratios and compressive strengths were experimentally explored and validated by error ratios for twenty-four specimens. The reliability was relatively high overall. The average error rate of all the specimens with steel fiber mixing ratios of 0, 0.75 and 1% was 3.36%. Accordingly, the results prove the applicability of the non-destructive test methods for building quality management.

中文翻译：

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使用应力波驱动无损检测方法估算钢纤维混凝土的抗压强度和构件尺寸

在纤维增强复合材料中，钢纤维已被广泛用于筒仓、隧道等混凝土基础设施中，专门用于减轻混凝土的重量，通过克服脆性来提高其强度。然而，对于钢纤维复合材料的适当质量管理和适用性评估仍然知之甚少。本研究通过钢纤维混凝土厚度估计测试维护的可能性和评估质量管理工具的适用性，填补了这一知识空白。为此，本研究采用了两种不同的应力波驱动的无损测试方法：超声波脉冲速度和冲击回波方法。采用超声波脉冲速度法估算钢纤维混凝土的抗压强度，而冲击回波法则用于估算各种钢纤维混凝土构件的厚度。作为混凝土的质量管理因素，钢纤维混合比和抗压强度之间的相关性通过 24 个试件的误差率进行了实验探索和验证。总体而言，可靠性较高。钢纤维混合比为0、0.75和1%的所有试件的平均误差率为3.36%。因此，结果证明了无损检测方法在建筑质量管理中的适用性。钢纤维混合比和抗压强度之间的相关性通过 24 个试样的误差比进行了实验探索和验证。总体而言，可靠性较高。钢纤维混合比为0、0.75和1%的所有试样的平均误差率为3.36%。因此，结果证明了无损检测方法在建筑质量管理中的适用性。钢纤维混合比和抗压强度之间的相关性通过实验探索并通过 24 个试样的误差比进行验证。总体而言，可靠性较高。钢纤维混合比为0、0.75和1%的所有试样的平均误差率为3.36%。因此，结果证明了无损检测方法在建筑质量管理中的适用性。