Karatosun Serkan, Ingeman-Nielsen Thomas, Ottosen Lisbeth M
Department of Environment and Resource Technology, DTU Sustain, Technical University of Denmark, Brovej, Building 118, 2800 Lyngby, Denmark.
Materials (Basel). 2025 May 24;18(11):2470. doi: 10.3390/ma18112470.
Concrete production has significant environmental impacts due to extensive raw material use and high CO emissions. Reusing structural concrete elements can potentially reduce these environmental impacts by reducing the demand for new production. However, reliable and practical documentation of concrete properties is needed for safe and scalable reuse. Although several non-destructive testing (NDT) methods show promise for in situ assessment of concrete properties, a clear gap remains in implementing them into a comprehensive approach for reuse documentation. This study investigates the potential of combining ultrasonic pulse velocity (UPV), rebound hammer (RH), and electrical resistivity (ER) methods for documenting concrete properties for reuse. Several parameters relevant to reuse scenarios, such as saturation level and aggregate type and size, were systematically evaluated to understand their impact on NDT documentation of concrete for reuse. NDT documentation of compressive strength and chloride migration coefficient was assessed on 120 cylindrical specimens. Fifteen concrete mixtures were used with three aggregate compositions and five water-cement ratios. The experimental results are discussed in the context of in situ documentation of structural elements in donor buildings to ensure the practical applicability of the findings. The findings show that these NDT methods can potentially document the properties of concrete reliably and practically, thereby addressing the lack of in situ documentation procedures needed to enable the safe and scalable reuse of structural elements.
由于大量使用原材料和高二氧化碳排放量，混凝土生产对环境有重大影响。重复使用结构混凝土构件有可能通过减少对新生产的需求来降低这些环境影响。然而，为了安全且可扩展地重复使用，需要可靠且实用的混凝土性能文件。尽管几种无损检测（NDT）方法在现场评估混凝土性能方面显示出前景，但在将它们纳入用于重复使用文件记录的综合方法方面仍存在明显差距。本研究调查了结合超声脉冲速度（UPV）、回弹锤（RH）和电阻率（ER）方法来记录混凝土性能以用于重复使用的潜力。系统评估了与重复使用场景相关的几个参数，如饱和度水平以及骨料类型和尺寸，以了解它们对用于重复使用的混凝土无损检测文件记录的影响。对120个圆柱形试件进行了抗压强度和氯离子迁移系数的无损检测文件记录评估。使用了15种混凝土混合物，具有三种骨料组成和五种水灰比。在捐赠建筑物结构构件的现场文件记录背景下讨论了实验结果，以确保研究结果的实际适用性。研究结果表明，这些无损检测方法有可能可靠且实际地记录混凝土的性能，从而解决了实现结构构件安全且可扩展重复使用所需的现场文件记录程序缺失的问题。
