Slab Rocking is concrete slabs constructed on unbound sub-bases can cause ‘steps’ at joints, the main cause being movement of the sub-base. As heavy vehicles such as forklifts travel over a joint, the slab on the approach side is deflected downward. When the wheel leaves, it quickly deflects upwards creating a gap of low pressure between the slab and the sub-base drawing minute amounts of material from beneath the departure slab to the other side of the joint.
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