Prior to the scarification, the depth of the rebar shall be verified in the field by the contractor. The original bridge deck surface shall be scarified to a depth as specified on the contract plans (1/4” minimum) with a mechanical milling machine capable of accurately and automatically establishing profile grades. Areas adjacent to the curb, scuppers, joints or other locations inaccessible to the milling machine shall be hand chipped. For decks with an existing wearing surface, all wearing surface material or existing concrete overlay, shall be completely removed either as a separate operation to the milling of the original deck, or in conjunction with it, provided adequate grade control can be maintained.
If mechanical milling results in the snagging of reinforcing steel, the operation shall be stopped immediately, and the depth of removal adjusted. Damaged or dislodged reinforcing steel as a result of contractor negligence during the operation shall be repaired or replaced at the contractor’s expense.
All construction debris, wearing surface material, or residual materials from the scarification process shall be completely removed from the bridge deck prior to the commencement of total surface hydrodemolition.