Non-contact rolling surface wave measurements

Bjurström, H. and Ryden, N. (2019) Non-contact rolling surface wave measurements on asphalt concrete. Road Materials and Pavement Design 20(2); 334-346 . doi.org/10.1080/14680629.2017.1390491

Rolling surface wave measurements on a single, thin asphalt concrete (AC) layer are presented to investigate their use in rapid nondestructive field tests. An array of 47 micro-electromechanical sensor (MEMS) microphones is mounted on a trailer together with an automated impact source. Multichannel recordings from single impacts are obtained at 80 equally spaced array positions as the trailer moves at a constant speed. Multiple sets of test results show good repeatability for the assessed shear wave velocity and demonstrate the strong temperature dependency of AC. The presented results indicate a possible application for quality assurance of AC using rolling surface wave measurements.