Table 3: Result of concrete strength measurement according to different standard (specification).

Name of componentRebound numberDepth of carbonation Crushing compressive strength By DBJ14-026-2004 By (1) Error (%)
(mm)(MPa)(MPa)(MPa)Equation (1)DBJ14-026-2004

Column 1-A39.56.034.326.632.94.022.6
Column 3-B38.66.035.125.531.510.227.6
Column 5-C39.55.033.228.434.02.514.5
Column 8-D39.35.537.527.233.211.627.5
Column 10-E38.96.035.825. 832.010.628.0
Column 15-F40.24.536.230.435.81.216.1
Mean relative error6.722.7