모르타르 중의 철근 측정에 관한 연구

A Study on Measurement of Steel in Mortar

  To study measurement of steel in mortar, a transient electro-magnetic (TEM) method was adapted. The secondary electro motive force(EMF) was measured with SIROTEMⅢ. The accelerator was equipped with the SIROTEMⅢ. The accelerator permits the transmitter to turn off approximately 10～15 times faster than normal. The high resolution time series used for very shallow or high resistivity investigation was selected. The sensors were made of enamelled wire with diameter of 0.25㎜ and a acril. The sensors configuration was used as coincident loop type. The steels were embedded in mortar which were made from sand : cement : water ratio of 2 : 1 : 0.5. The mortar specimen was 50㎝ long, 20㎝ wide and 10㎝ thick. The mortar specimen was 50㎝ long, 20㎝ wide and 10㎝ thick. To investigate steel corrosion in mortar, the sensors were used with 2×2㎠(3, 6, 9Ω), 3×3㎠(3, 6, 9Ω) and 6×6㎠(3, 6, 9Ω). The obtained result showed that the sensor 8 (6×6㎠, 6Ω) was the proper sensor for the measurement of steel in mortar.