The sensor system TRIME®--ES with tube access probe T3/22 determines continuously the water content in concrete and stones. The small dimension with 22mm diameter offers advantages in installation, both horizontal or vertical up to 3.5m depth. Inserting the probe is easy even at places difficult to access.
The measurement is independent of temperature and salinity. A most important fact for reliable readings in these monitoring applications.
Netherlands Reichswaterstaad (Ministry of Transport, Public Works & Water management) runs a research project on bridges' life-time extension using TRIME-ES for monitoring 16 bridges along the highway A59 between s'Hertogenbosch, NL and Breda, NL.
Installation method 1 for probe T3/22
Bring in an unruffled flat borehole (up to 2m depth) with a diameter of 22mm (+-1mm) inside the concrete where the T3/22 probe can be completely encapsulated with pottant inside the borehole. With the pottant it is secured that no water penetrates inside the borehole and the T3/22 probe can measure over very long time (years) installation. Before encapsulating the borehole it is necessary to check the T3/22 concerning reliable measurement values. There should be no sand or small stones between the probe and the surface of the borehole.
Advantage of method 1
Disadvantage of method 1
Method 1 needs coated probe plates of the T3/22 which are pressed on inside the surface of the borehole.
Installation method 2 for probe T3/22
Bring in an unruffled flat borehole with a diameter of 22,5mm (+0,3mm) inside rock or concrete. A small plastic tube can be installed inside the borehole. The T3/22 probe can be pushed inside the plastic tube for measuring. Necessary is also a sealing of the plastic tube around the borehole with pottant.
Advantage of method 2
Disadvantage of method 2
It is to mention that the installation method 1 is easier and more robust against water protection!