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首页> 美国卫生研究院文献>Materials >Validation of Selected Non-Destructive Methods for Determining the Compressive Strength of Masonry Units Made of Autoclaved Aerated Concrete
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Validation of Selected Non-Destructive Methods for Determining the Compressive Strength of Masonry Units Made of Autoclaved Aerated Concrete

机译：确定高压加气混凝土砌体单元抗压强度的非破坏性方法的验证

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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 fBw for 127 standard specimens tested at different levels of water content (w = 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 cp was tested with the transmission method using the ultrasonic pulse velocity method with exponential transducers. The curve (fBw–cp) for determining the compressive strength of AAC elements with any moisture level (fBw) 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 fbw–cp is scaled.
机译：较小破坏性（MDT）和非破坏性（NDT）技术由于其复杂且难以执行而通常不用于砌体。本文介绍了以下方法的验证：高压灭菌加气混凝土（AAC）的半无损，无损和超声技术。本研究的主题涵盖了在各种湿度水平下声明的各种密度等级（400、500、600和700（kg / m 3 ）的AAC测试元件的抗压强度。经验数据包括样品的形状和尺寸，是通过使用普通混凝土的一般关系（Neville曲线）对494个圆柱和长方体样品以及100 mm×100 mm×100 mm的标准立方体样品进行测试得出的。在确定水分含量不同（w = 100％，67％，33％，23％和10％）的127个标准样品的强度fBw时，考虑了水分对AAC的影响。定义的经验关系适用于校正干燥样品的抗压强度。对于91个100毫米×100毫米×100毫米的样本，通过透射法使用指数传感器的超声脉冲速度法对P波速度cp进行了测试。建立了用于确定AAC元素在任何水分含量（fBw）下的抗压强度的曲线（fBw-cp）。事实证明，开发的方法具有统计学意义，可以在原位测试中成功应用。半无损检测可以单独使用，而无损检测技术只能在已缩放的曲线fbw–cp缩放时应用。

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