582HOT-MIX ASPHALT SURFACING ON BRIDGE DECKS

581.10 Basis of Payment. This work will be paid for at the contract unit price

per square yard (square meter) for WATERPROOFING MEMBRANE SYSTEM. SECTION 582. HOT-MIX ASPHALT SURFACING ON BRIDGE DECKS

582.01 Description. This work shall consist of constructing a hot-mix asphalt

(HMA) surface course on a prepared bridge deck.

582.02 Materials. Materials shall be according to Article 406.02.

582.03 Equipment. Equipment shall be according to Article 406.03, except

vibratory rollers will not be permitted on bridge decks. CONSTRUCTION REQUIREMENTS

582.04 General. Work shall be according to Section 406, except as specified

herein. Only a tandem roller, meeting the requirements of Table 1 of Article 406.07(a), will be permitted for breakdown rolling.

582.05 Target Density. A target density will be established from tests

conducted on a calibration strip consisting of 100 ft (30 m) of HMA surface course placed on the bridge deck. A target count rate which represents the maximum compactive effort will be determined with nuclear testing equipment within the calibration strip. Compaction of the calibration strip with the breakdown roller shall commence immediately after the surface course is placed and shall be continuous and uniform over the entire area. All rolling operations must be completed before the temperature of the mixture drops below 190 °F (90 °C). At a minimum of two random locations within the calibration strip, a growth curve consisting of a plot of counts per minute vs. number of passes with a breakdown roller will be developed. The growth curve at each random location will be established by using a nuclear gauge using a fast count or with a nuclear gauge using a 30-second timing cycle in the backscatter position. Tests will be made after each pass until the lowest count either raises or remains the same. At this time, mineral filler will be spread and a 4 minute (calibration) count will be taken in the backscatter position to establish the relative target density. Art. 582.06 Portland Cement Mortar Fairing Course The established average target density shall apply throughout the project unless there are changes in mix materials or an appreciable change in the job mix formula. The Engineer may require a new average target density to be established if there is reason to believe that the mixture being placed is not the same as the mixture used to determine the target density.

582.06 Acceptance Tests. Acceptance tests will be performed once the

average target density has been established. At least one acceptance test will be taken for each 200 ft (60 m) or portion thereof of bridge deck per paver pass. Acceptance tests on material placed in a single day shall average 98 percent of the established average target density with no one test being below 95 nor more than 103 percent of the established target density. If the above requirements for average or individual density tests cannot be obtained, placement of additional material will be discontinued until the cause of the failure is investigated and corrected. Acceptance tests will be performed with the same nuclear equipment used to establish the average target density. Acceptance tests will be for one-minute duration and the area to be tested shall be prepared with mineral filler prior to testing.

582.07 Method of Measurement. This work will be measured for payment

according to Article 406.13.

582.08 Basis of Payment. This work will be paid for according to

Article 406 — 14.

SECTION 583. PORTLAND CEMENT MORTAR FAIRING COURSE