Granite Construction 5/14/2020 - Laserfiche WebLink

I 1 system for the asphalt binder shall be designed to ensure proper and continuous 2 circulation during the operating period. A valve for the purpose of sampling the 3 asphalt binder shall be placed in either the storage tank or in the supply line to the 4 mixer. 5 2. Thermometric Equipment—An armored thermometer, capable of detecting 1 6 temperature ranges expected in the HMA mix, shall be fixed in the asphalt binder 7 feed line at a location near the charging valve at the mixer unit. The thermometer 8 location shall be convenient and safe for access by Inspectors. The plant shall also 9 be equipped with an approved dial-scale thermometer, a mercury actuated 10 thermometer, an electric pyrometer, or another approved thermometric instrument 11 placed at the discharge chute of the drier to automatically register or indicate the I 12 temperature of the heated aggregates. This device shall be in full view of the plant 13 operator. 14 3. Heating of Asphalt Binder—The temperature of the asphalt binder shall not exceed I 15 the maximum recommended by the asphalt binder manufacturer nor shall it be below 16 the minimum temperature required to maintain the asphalt binder in a homogeneous 17 state. The asphalt binder shall be heated in a manner that will avoid local variations I 18 in heating. The heating method shall provide a continuous supply of asphalt binder to 19 the mixer at a uniform average temperature with no individual variations exceeding 20 25°F. Also, when a WMA additive is included in the asphalt binder, the temperature I 21 of the asphalt binder shall not exceed the maximum recommended by the 22 manufacturer of the WMA additive. 23 4. Sampling and Testing of Mineral Materials—The HMA plant shall be equipped , 24 with a mechanical sampler for the sampling of the mineral materials. The mechanical 25 sampler shall meet the requirements of Section 1-05.6 for the crushing and 26 screening operation. The Contractor shall provide for the setup and operation of the 27 field testing facilities of the Contracting Agency as provided for in Section 3-01.2(2). I 28 5. Sampling HMA—The HMA plant shall provide for sampling HMA by one of the 29 following methods: I 30 a. A mechanical sampling device attached to the HMA plant. 31 b. Platforms or devices to enable sampling from the hauling vehicle without 32 entering the hauling vehicle. I 33 34 5-04.3(3)B Hauling Equipment 35 Trucks used for hauling HMA shall have tight, clean, smooth metal beds and shall have a I 36 cover of canvas or other suitable material of sufficient size to protect the mixture from 37 adverse weather. Whenever the weather conditions during the work shift include, or are 38 forecast to include, precipitation or an air temperature less than 45°F or when time from I 39 loading to unloading exceeds 30 minutes, the cover shall be securely attached to protect the 40 HMA. 41 I 42 The contractor shall provide an environmentally benign means to prevent the HMA mixture 43 from adhering to the hauling equipment. Excess release agent shall be drained prior to filling 44 hauling equipment with HMA. Petroleum derivatives or other coating material that 111 45 contaminate or alter the characteristics of the HMA shall not be used. For live bed trucks, 46 the conveyer shall be in operation during the process of applying the release agent. 47 I I 48 49 50 2020 PAVEMENT MAINTENANCE OVERLAY PAGE 46 OF 79 SPECIAL PROVISIONS WORK ORDER 3727 FEBRUARY 20,2020