1041SCARIFICATION

1041.1DESCRIPTION—This work is scarifying existing concrete bridge decks in one or multiple passes

as indicated to the overall uniform depth, in preparation for placing a concrete or mortar wearing surface or before performing hydrodemolition surface preparation.

1041.2MATERIAL—Not used.

1041.3CONSTRUCTION—

concrete surfaces. Before scarification, perform a precondition survey of the existing concrete bridge deck cracks to locate potential reflective cracks in the wearing surface. Perform a bridge deck survey as specified in Section 1042.3(b). Do not perform scarification on new concrete until a compressive strength of 3,300 psi is attained. Verify the cover of the top mat of reinforcement bars before scarification. Scarify the existing concrete bridge deck the number of uniform depth passes indicated to the required overall removal depth. When hydrodemolition is not indicated, perform scarification in 1/4-inch maximum uniform depth passes. When hydrodemolition is indicated, perform scarification in 1/4 inch or 1/2-inch uniform depth passes as indicated. If the overall removal depth indicated was not achieved, perform additional scarification to the overall removal depth at no additional cost to the Department. When existing overlays are present or are indicated for removal, do not demobilize the scarification equipment until the R epresentative verifies the removal depth and complete removal of existing overlays up to 1/2 inch to the top mat of reinforcement bars. Do not scarify within a 1/2-inch clearance of the top mat of reinforcement bars. Clean the deck surface as directed for verification of the removal depth and to ensure existing overlays were completely removed or the deck has been removed to 1/2 inch of the top mat of reinforcement bars. In areas inaccessible to scarification equipment, use pneumatic hammers not exceeding 30 foot-pounds, operated at no more than a 45- degree angle from horizontal to remove the required depth indicated. Do not use triple-headed tampers fitted with star drills less than 2 inches in diameter. Completely remove by hand, power broom, or vacuum all broken concrete and laitance resulting from the scarification operation. Do not flush debris. Remove debris at the end of each workday. Clean debris from scuppers and downspouts as needed. Do not allow construction vehicles or equipment, other than power brooms, on the scarified deck surface, unless the surface is adequately protected to prevent contamination.

day. The equipment used for scarification is required to remove the single pass depth indicated across the cutting path. A micromill milling machine is required when scarifying before placing a polyester polymer concrete overlay.

1041.4MEASUREMENT AND PAYMENT—Square Yard for the single pass depth indicated.

Payment will only be made for the surface area of each uniform single pass depth indicated and required to achieve the overall removal depth regardless of the number of passes made with the scarifying equipment.