TY - CONF A1 - Adão, Filipe Jorge Santos Ferreira A1 - Helmerich, Rosemarie A1 - Voigt, Gerrit A1 - Moldenhauer, Laura A1 - Neumann, Patrick P. T1 - Humidity monitoring in concrete using Bluetooth Low Energy sensors N2 - The vulnerability of low quality concrete to changing weather conditions is well known. The constant exposure to temperature changes, biological activity, and humidity ends up in damage to buildings and structures which contain this material. It is therefore necessary to take preventive measures to control the extent of the damage done by weathering and possible penetration of adverse chemicals into structures which need public safety. The Federal Institute for Materials Research and Testing (BAM), in cooperation with the small enterprise LinTech GmbH, is working on a project to monitor humidity changes in concrete by analyzing the changes in signal strength (RSSI) from Bluetooth Low Energy sensors. In this paper, we show results which demonstrate the influence of changing water content in concrete on the received RSSI. We observed that as water content in concrete decreases, the received RSSI improves. However, the damping effect is not linearly proportional to water content, rather exponentially proportional. This suggests that changes in the received signal strength are more easily observed when water content in concrete is higher. Finally, we reconstructed a RSSI distribution map using computed tomography T2 - SMAR 2017 CY - Zurich, Switzerland DA - 13.09.2017 KW - RSSI KW - Concrete KW - Water KW - Monitoring KW - Computed Tomography PY - 2017 AN - OPUS4-43599 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -