| Summary: | 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/m<sup>3</sup>), 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 <i>f</i><sub>Bw</sub> for 127 standard specimens tested at different levels of water content (<i>w</i> = 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 <i>c</i><sub>p</sub> was tested with the transmission method using the ultrasonic pulse velocity method with exponential transducers. The curve (<i>f</i><sub>Bw</sub>⁻<i>c</i><sub>p</sub>) for determining the compressive strength of AAC elements with any moisture level (<i>f</i><sub>Bw</sub>) 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 <i>f</i><sub>bw</sub>⁻<i>c</i><sub>p</sub> is scaled.
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