The authors have studied Figg’s idea of the drilled hole as an in-situ water absorption testing method. This study aimed to propose an in-situ water absorption testing method for cover concrete up to 50mm from the surface, examining factors affecting the testing results. As a result, the test specifications were determined and the in-situ water absorption assessing method using drilled hole was proposed. The effects of material, mix proportion and curing on the testing results were investigated and the standard deviations of the water absorption data under different water-cement ratios and demolding age were shown.
