Thermal integrity profiling is a recognised technique for assessing the integrity of concrete foundation structures. This paper describes CemOptics, a new method for obtaining the temperature measurements required for this technique which makes use of distributed fibre optic sensing to collect temperature data. CemOptics has been used on a variety of foundation projects in the UK including the construction of Battersea Junction Station, part of the Northern Line extension project. As well as providing the details of this project, this paper also presents data on the measured temperature changes following completion of concreting operations. Known defects are evaluated to establish the optimal monitoring periods for identifying significant anomalies. Finally, temperature measurements taken during the construction process are presented which provide an insight into the flow pattern of tremied concrete within a diaphragm wall panel.
Subjects: distributed fibre optic sensing, thermal integrity profiling, concrete
Author: Anthony N. Fisher Testing and Instrumentation Manager and Andrew G. Bell Chief Engineer
Publisher: DFI, EFFC