CORDIS provides links to public deliverables and publications of HORIZON projects.
Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .
Exploitable results
Probe for the determination of pH level in concrete.
The probe may be used for installation and long-term measurements in existing structures where the corrosion of the reinforcement and the alkali-aggregate reaction may lead to the deterioration of the structure.
Efforts were concentrated on the choice of the best type of probe through laboratory testing, in particular on the choice of material non pH sensitive.
Different techniques were tested to define the procedures for installation.
The system allows to transfer data from a monitored structure to a remote office for processing.
OSMOS DEHA-COM GmbH tested the data transmission software named "Carbon Copy" for two-way communication and established a test connection between the OSMOS DEHA-COM SA office in Paris and the OSMOS DEHA-COM GmbH office in Cologne via telephone line.
A test data transmission line was established between two bridges in East-Germany and Cologne office and a procedure of data transmission from mobile telephone was tested.
OSMOS DEHA-COM GmbH tested a remote data transmission under different operating systems for PC computer (WINDOWS and DOS) in the laboratory.
The humidity of the concrete must be related to different parameters for different deterioration mechanisms. In the case of corrosion of reinforcement in concrete structures it is important to determine it with regard to freeze-thaw deterioration, alkali-silica reaction and sulphate attack.
The humidity probe derives information on the humidity of concrete through frequency measures and may monitor its changes in time.
It may be used in new and existing concrete structures.
The combination of the principle of measure with a new concept of design makes this sensor a new one.
Sensor for monitoring the vibrations (acceleration) of existing structures.
Clean-room manufacturing facilities have been set up for small quantities of EFPI-V, EFPI-V with different mechanical parameters (resonance frequency) have been manufactured and characterized in laboratory tests with a Kistler K-beam 8304- accelerometer as reference.
initial outdoor tests have been performed with airport ground traffic monitoring and vibration monitoring at the Skovdiget bridge.
The preliminary results show the sensor to be suitable for low frequency (<100Hz) acceleration sensing with mg sensitivity. At the initial bridge vibration testing a response is observed also in the < 5 Hz range where the reference sensor shows no signal.
This portable equipment is based on the Galvanostatic Pulse Method, a rapid non-destructive polarization technique to determine corrosion rates and potentials of reinforcement in concrete structures.
This equipment may be used to measure and to monitor the state of corrosion of reinforcement and its progress in concrete structures.
Tests have been conducted on-site on four bridges by Autostrade to check the performances of the equipment.
Efforts have been concentrated on the improvement of the counter electrode system, the data logging system and the data interpretation.
The humidity of the concrete must be related to different parameters for different deterioration mechanisms. In the case of corrosion of reinforcement in concrete structures it is important to determine it with regard to freeze-thaw deterioration, alkali-silica reaction and sulphate attack.
Humidity of the concrete is inferred by measuring the electrical resistance of the concrete. The measure is done between the rings which are located at different depths from the concrete surface.
The sensor may be used in existing concrete structures.
Improvement of the installation procedure for installations into vertical walls and over-head into the concrete. Selection of a suitable mortar to connect the sensor with the concrete. Calibration of the sensor and mortar in laboratory for different types of concrete and environmental conditions.
The Multiring-Electrode still has to be tested in a concrete structure to show its suitability also under the conditions in actual practice, which will be carried out within the project.
The extensometers of OSMOS DEHA-COM GmbH are used to measure with high accuracy the displacement of an observed point. The objectives were a) to improve the mechanical stability of the extensometers to allow the application in a rugged ambient and b) to investigate the temperature sensitivity.
The mechanical construction of the extensometers was slightly modified so that the extensometers can tolerate minor angular errors which can occur in the field where they are mounted. This change has no impact on the measurement principle or on the accuracy. The temperature behavior of different extensometers based on different ways of using he microbending effect was analyzed and improved.
System necessary for the acquistion of raw signals from the optic fiber sensors.
Based on a background patent describing a two-wavelength passive quadrature microinterferometer demodulation system and an early version of a three wavelength(3-lambda) phase demodulation unit working at 820 nm wavelength, a new lower cost and environmentally more stable version of the (3-lambda) - digital phase demodulation has been realized for installation at the Skovdiget bridge.
A new microcontroller board and new phase demodulation software has been developed for this purpose. The system is presently under test.
System for collecting and storing all the raw signals coming from the different sensors mounted on the structures.
OSMOS DEHA-COM GmbH tested a conception of PC-based data acquisition / data storage system in lab and different types of Analogue - Digital Conversion cards for PCs. A model was created for the connection of different types of sensors of all partners to a common PC based data acquisition system
This sensor gives the displacements of a determined structure by measuring along its own entire length (some meters).
The basic construction of the optical strands from OSMOS DEHA-COM GmbH is a twisted pair of fibers that senses the building. A linear relationship between the measured attentuation of the transmitted light and the given expansion of the opticals strand facilitiates the extraction of the length changes of the supervised distance at a building. OSMOS DEHA-SOM GmbH investigated the impact of the type of the nodes formed by the twisted pair of fibres on the linearity of the measured attenutation. The linearity was improved.
Sensor for evaluating the dynamic strain in existing structures.
Clean-room manufacturing facilities have been set up for small quantities of EFPI-S. EFPI-S with different mechanical parameters (sensing length 1 - 10 cm) have been characterized in laboratory tests with a Hottinger resistive strain gauges as reference. Initial practical tests have been performed with strain measurements on PZT-ceramics, steel rod and carbon-fiber reinforced plastic (CFRP-) structures.
The preliminary results show the sensor to be suitable for high resolution dynamic and static strain sensing with ne (=10e-9) sensitivity (corresponding to 10 pm displacement) if the new patented three-wavelength digital demodulation system is used for readout.
The software will be based on an Internet-approach, where the monitored data are accessible to the users along with the current version of software. The software will provide access to the raw monitored data for downloading, will present and evaluate the monitored data and will provide an early-warning for deterioration initiation and growth.
The software will integrate the deterioration models with the monitored data for the probes, which register data for chloride content, pH-levels, moisture, humidity, temperature and corrosion risk as well as deflections and vibrations.
The first version of the software system for has been set up and is being tested.
The probe may be installed in existing concrete structures.
It monitors the critical depth at which corrosion takes place and subsequently the time to corrosion intitiation.
This is achieved by measuring the potential and the current at the level of the single rings of the sensor which are at different depths in the concrete.
It may also measure the electrical resistivity of the concrete between the rings.
Improvements have been reached in the installation procedure especially by definition of the geometry-requirements of the hole to be drilled and by development of installation-tools keeping the Expansion-Ring-Anode in exact position during the expansion procedure by turning the nuts.
Calibration tests have been carried out to determine critical signals indicating corrosion. Special tests have shown, that the concrete is not damaged by expansion forming cracks or spalling.
The installation into the bridge within this project will show the behaviour under the condition of actual practice.
This sensor is aimed at detecting cracks in existing structures by measuring the noise generated during their formation.
Based on a background patent of a fiber-optic microphone a new miniaturized and environmentally more stable version of the microinterferometer acoustic sensor has been realized. It is based on a standard 1/2" -capacitive microphone housing. The sensor has been characterized in an acoustic test chamber with a Bruel+Kjaer reference microphone and with an acoustic pressure standard. Initial practical tests with the new EFPI-A version under harsh environmental conditions are under preparation using DLR's airport ground traffic monitoring facilities.
Probe suitable for long-term measurements of free-chloride content in concrete.
The probe may be embedded in existing concrete structures.
Monitoring of chloride concentration in concrete is useful in a number of fields related to the corrosion of reinforcement and its prevention. In this sense it may be used for the early detection of the risk of corrosion in existing structures.
Testing of long-term stability of sensors is promising.
Procedures for installation in existing structures have been improved.
The probe consists of 8 nails embedded in pairs at different depths in the concrete. It measures both potential and current. In this way, it may monitor in time the critical depth at which corrosion take place and as a consequence the time to corrosion initiation of the reinforcement.
It may be used only in existing concrete structures.
Changes in the design of the sensors have been necessary to improve the installation procedures and reliablity of measures.
Changes in the design of the connection between the probe and the cane for data acquisition.
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