Jasiński Radosław, Drobiec Łukasz, Mazur Wojciech
Department of Building Structures, Silesian University of Technology; ul. Akademicka 5, 44-100 Gliwice, Poland.
Materials (Basel). 2019 Jan 26;12(3):389. doi: 10.3390/ma12030389.
Minor-destructive (MDT) and non-destructive (NDT) techniques are not commonly used for masonry as they are complex and difficult to perform. This paper describes validation of the following methods: semi-non-destructive, non-destructive, and ultrasonic technique for autoclaved aerated concrete (AAC). The subject of this study covers the compressive strength of AAC test elements with declared various density classes of: 400, 500, 600, and 700 (kg/m³), at various moisture levels. Empirical data including the shape and size of specimens, were established from tests on 494 cylindrical and cuboid specimens, and standard cube specimens 100 mm × 100 mm × 100 mm using the general relationship for ordinary concrete (Neville's curve). The effect of moisture on AAC was taken into account while determining the strength for 127 standard specimens tested at different levels of water content ( = 100%, 67%, 33%, 23%, and 10%). Defined empirical relations were suitable to correct the compressive strength of dry specimens. For 91 specimens 100 mm × 100 mm × 100 mm, the P-wave velocity was tested with the transmission method using the ultrasonic pulse velocity method with exponential transducers. The curve (⁻) for determining the compressive strength of AAC elements with any moisture level () was established. The developed methods turned out to be statistically significant and can be successfully applied during in-situ tests. Semi-non-destructive testing can be used independently, whereas the non-destructive technique can be only applied when the developed curve ⁻ is scaled.
轻微破损（MDT）和无损（NDT）技术在砖石结构中并不常用，因为它们复杂且难以实施。本文描述了以下方法的验证：用于蒸压加气混凝土（AAC）的半无损、无损和超声技术。本研究的主题涵盖了不同密度等级（400、500、600和700（kg/m³））、不同湿度水平的AAC测试元件的抗压强度。通过对494个圆柱形和长方体试件以及100mm×100mm×100mm的标准立方体试件进行测试，利用普通混凝土的一般关系（内维尔曲线）建立了包括试件形状和尺寸在内的经验数据。在确定127个在不同含水量水平（ = 100%、67%、33%、23%和10%）下测试的标准试件的强度时，考虑了湿度对AAC的影响。定义的经验关系适用于校正干燥试件的抗压强度。对于91个100mm×100mm×100mm的试件，使用指数换能器通过超声脉冲速度法的透射法测试了P波速度。建立了用于确定任何湿度水平（）下AAC元件抗压强度的曲线（⁻）。所开发的方法在统计上具有显著意义，可成功应用于现场测试。半无损检测可以独立使用，而无损技术只有在对所开发的曲线⁻进行缩放后才能应用。
