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                            [content] => * The study presents a non-destructive method for estimating the compressive strength of concrete, addressing the challenge of varying wave velocity due to coarse aggregate distribution. *! 
* This method utilizes laser-induced breakdown spectroscopy along with multivariate analysis techniques, particularly principal component analysis and partial least squares regression, to accurately assess concrete's compressive strength. *! 
* Results demonstrate that the new approach aligns well with traditional compressive strength tests, allowing for efficient on-site measurements without being affected by noise in the spectral data. *!
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