| Title |
Evaluation of Carbonation Depth in Concrete Using the Core-Drilling Test Method and Comparative Analysis with Conventional Methods |
| Authors |
이혁주(Lee, Hyeog-Ju) ; 한민철(Han, Min-Cheol) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.4.385 |
| Keywords |
Concrete Carbonation; Coring; Core-Drilling; Drilling |
| Abstract |
This study proposes a core-drilling method to enhance both the accuracy and speed of measuring carbonation depth in concrete, overcoming
the low speed of the coring method and the low accuracy of the drilling method. Concrete specimens were tested using coring, core-drilling,
and drilling methods, and the results were analyzed and verified through microstructural examinations. The core-drilling method showed
carbonation depths similar to coring, attributed to the use of a core bit size unaffected by coarse aggregate and a dust collection device that
minimized aggregate interference and dust effects. In contrast, the drilling method produced greater depths, likely due to coarse aggregate and
dust influence under identical carbonation conditions and mix proportions. Standard deviation analysis indicated that core-drilling achieved
precision comparable to coring, whereas drilling showed larger deviations across all binder types. Thermogravimetric analysis (TGA) and
scanning electron microscopy (SEM) confirmed carbonation through Ca(OH)₂ decomposition and CaCO3 formation. However, some drilling
samples classified as carbonated contained residual Ca(OH)2, indicating possible boundary errors. Correlation analysis demonstrated a stronger
relationship between core-drilling and coring than with drilling, suggesting that the proposed method can match the accuracy of coring while
enabling rapid carbonation depth evaluation without additional processing. |