An Experimental Approach for Characterisation of Concrete Damage Using the Wheatstone Bridge Circuit
Tóm tắt
In this paper, a method for the detection of concrete damage under three bending test using Wheatstone bridge concept is presented. The damage is detected by monitoring a change in voltage drop (ΔV) at the Wheatstone bridge. Good correlations between crack opening and voltage drop and between damage variable and voltage drop were observed. Results of these tests confirmed that the voltage drop increase with the increase of the damage. The voltage drop significantly increases from 0.005 to 0.340 V when the damage variable increases from 0.005 to 0.93. At this stage, specimen can be considered as completely fractured. Thus, this underlines that the self-sensing method using Wheatstone bridge as the concept of electrical resistance concrete measurement is one potential technique to detect mechanical damage. Furthermore, a special effort was put on investigation of the optimal location of electrodes, i.e. which location along the specimens is the most sensitive to the damage, and the higher sensitivity is obtained when the electrodes are close to the crack location. It has been found that the sensitivity may drop by 50% when the distance between the sensor and the notch tip increases of 400%. Finally, digital image correlation (DIC) technique is also used to investigate the crack propagation during the test and to define its correlation with Wheatstone bridge voltage drop.
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