Bissone

The results of the SOFO sensors were compared to the ones obtained with the surface mounted mechanical gauge and with measurements performed on a concrete prism preserved in controlled temperature and humidity conditions. The figure compares the results obtained with these different methods. The prism shows larger values because its shrinkage is not hindered by the old concrete. The mechanical gauge and, to a lesser extent, the B SOFO sensor show important oscillations due to the environmental humidity and temperature changes (sun, rain, wind,...). The A SOFO sensor, installed near the old concrete surface, shows a much smaller shrinkage indicating a good adhesion between the two materials. This application shows the interest of internal deformation measurements for the evaluation of the material quality.