It may be necessary to assess if a crack is still moving, for example to determine whether it is due to temperature changes or to early thermal contraction. This may be done by using simple ‘tell-tales’ bonded across cracks, which will show if further movement takes place. If a more precise measure of the movement is required a Demec gauge, or similar may be used to measure the relative movement of studs bonded on the concrete’s surface at a set distance apart across the crack.
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