Evaluation of Procedures for In Situ Tensile Bond Testing of Concrete Repairs

J. E. McDonald, A. Vaysburd
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Abstract

To achieve durable repairs, it is usually necessary to ensure adequate bond between the repair and the existing concrete substrate. Tensile bond tests are being increasingly used for quality control/quality assurance testing. However, there has been little standardization of test methods. Consequently, a total of 266 partial-depth cores in 77 experimental repairs were tested to evaluate the effect of material properties and environmental conditions on the bond between nine repair materials and a common concrete substrate. Three pull-off testing devices were used to determine bond strengths for each of the experimental repairs. In addition, the testing devices themselves were evaluated by analyzing the magnitude and relative precision of the pull-off strengths, modes of failure, and ease of use in an effort to identify a reliable and practical device for determining in situ tensile bond. The optimum depth of core drilling into the existing substrate was determined by comparing theoretical finite element analyses of failure stress and location with measured test results.
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混凝土修补现场拉伸粘结试验方法评价
为了实现持久的修复,通常需要确保修复与现有混凝土基材之间有足够的粘合。拉伸粘结试验越来越多地用于质量控制/质量保证测试。然而,测试方法几乎没有标准化。因此,我们对77个试验修复中的266个部分深度岩心进行了测试,以评估材料性能和环境条件对9种修复材料与普通混凝土基材之间结合的影响。三个拉脱测试装置用于确定每个实验修复的粘结强度。此外,通过分析拉拔强度、失效模式和易用性的大小和相对精度,对测试设备本身进行了评估,以确定一种可靠实用的设备来确定原位拉伸键合。通过对破坏应力和位置的理论有限元分析与实测试验结果进行比较,确定了岩心钻入现有基板的最佳深度。
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