TY - JOUR A1 - Prasad M, K. A1 - Wiggenhauser, Herbert A1 - Balasubramaniam, Krishnan T1 - Detection of honeycomb defects in reinforced concrete structures using acoustic pulse-echo methods and wavelet transforms N2 - Honeycombs/compaction faults occur in the concrete structures due to improper solidification of the concrete, which may reduce the strength of the concrete and also act as a passage for the water/acids that further corrodes the reinforcements. This paper explores about the acoustic pulse-echo techniques for the detection of honeycomb defects in a laboratory specimen located at the Federal Institute for Materials Research and Testing (BAM), Berlin. Since concrete is an inhomogeneous medium, the defect Signals are masked by the material noise due to large amount of scattering/ reflections of acoustic waves. A filtering method using the discrete wavelet transforms is applied on the ultrasonic time Signals for the better localization of defects. KW - Honeycomb defects KW - Acoustic pulse-echo methods KW - Wavelets transforms PY - 2011 SN - 0973-9610 VL - 10 IS - 3 SP - 53 EP - 59 PB - ISNT CY - Chennai AN - OPUS4-27631 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -