Construction Strain

The akustoelastischen concrete strain gauge can be mounted outside on construction parts made of steel. With flanges or angle mounted easily. The variable length of the sensors is especially beneficial. The reduction of the sensors can be done on the construction site.

The terminal points of the sensors are freely selectable within the length of the sensor. By default, the Terminal spacing between 25 mm and 2500 mm are to choose. Longer sensors are possible on request. The strength of the transducer (diameter of the rods) can be selected according to the strength of the reinforcement. The elongation measured with ultrasound after the pulse-echo method. In the connecting head of the concrete voltage sensor, an ultrasonic sensor is included.

The runtime in the measuring element is measured in high resolution. The run time increases linearly with the stretch in the elastic range. The concrete surrounding the transducer imposes a strain, or extension to the measuring element under load. The change in the length of the measuring element is not only load – or voltage-dependent, but also on the temperature. Therefore, a permanent temperature measurement is integrated in the sensor. The monitor to measure the elongation takes into account both factors. The term due to the change in length and akustoelastischen effect has grown due to the action of the surrounding concrete on the measuring element. The monitor is equipped with a microprocessor determines the respective difference to the reference measurement without load or applied voltage and calculates the length change in voltage to. The absolute dissolution of the transducer is regardless of its length and better than 0.0001 mm. An important application is the use of the transducer for the measurement of the steel strain of reinforcement. The cross sections and the diameter of the measuring elements equal to or less than selects the reinforcement, exceeding the maximum yield strength of reinforcement elements can be avoided. The monitoring of the structure on load deformation can be integrated in a monitoring system for building monitoring thus. It listens on exceeding the critical strain of steel reinforcement. With the new sensors from IBJ technology (www.ibj-technology.com) critical operating conditions, which resulted in an undersized reinforcement under previously incorrectly estimated or calculated combinations, can be detected in a timely manner, before the failure of the building. Buildings with highly varying load factors can be monitored so efficiently online. Akustoelastische concrete strain transducer subject to no aging. Due to the principle of running time measurement in a steel rod, long term drift and change the calibration data are irrelevant. Compressive stress and tension can be measured each lengthwise to the akustoelastischen concrete strain gauge. Particularly complete insensitivity to moisture and other atmospheric agents, recommend these sensors for use in the Construction industry under all climatic conditions.

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