The plate with scales marked in millimeter units of measurement is fixed on one side of the crack and the other plate marked with cursor is fixed on opposite side of the crack as it is shown in Figure 3. Plastic tell tale consist of two overlapped plates. It is the most famous system used to monitor crack width variation. The resolution of 0.1mm can be achieved with magnified graticule if necessary cautions are practiced.įig.2: Crack Width Measurement Magnifier Plastic Tell Tale The monitoring is conducted by measuring the offset between two pencil marks utilizing magnified graticule. Magnified graticule is used to monitor internal crack in smooth finishes. That is why steel ruler measurements are used for assessing state of damage at the beginning of investigation. It should be bear in mind that steel rule measurements are subjective because it is not possible to measure crack width from the same point each time the measurement is taken. The width of the crack can be measured to the nearest 0.5mm provided that great care is practiced. Steel ruler is simple instrument used to monitor crack width variation. The following are the instruments used to monitor crack width variations: Methods to Monitor Crack Width Changes in Concrete Methods to Monitor Crack Width Changes in Concrete.
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