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18TH STREET PEDESTRIAN IMPROVEMENTS 3741 RMT July 03, 2024 42 The circulating system for the asphalt binder shall be designed to ensure proper 1 and continuous circulation during the operating period. A valve for the purpose of 2 sampling the asphalt binder shall be placed in either the storage tank or in the 3 supply line to the mixer. 4 2. Thermometric Equipment – An armored thermometer, capable of detecting 5 temperature ranges expected in the HMA mix, shall be fixed in the asphalt binder 6 feed line at a location near the charging valve at the mixer unit. The thermometer 7 location shall be convenient and safe for access by Inspectors. The plant shall 8 also be equipped with an approved dial-scale thermometer, a mercury actuated 9 thermometer, an electric pyrometer, or another approved thermometric 10 instrument placed at the discharge chute of the drier to automatically register or 11 indicate the temperature of the heated aggregates. This device shall be in full 12 view of the plant operator. 13 3. Heating of Asphalt Binder – The temperature of the asphalt binder shall not 14 exceed the maximum recommended by the asphalt binder manufacturer nor shall 15 it be below the minimum temperature required to maintain the asphalt binder in a 16 homogeneous state. The asphalt binder shall be heated in a manner that will 17 avoid local variations in heating. The heating method shall provide a continuous 18 supply of asphalt binder to the mixer at a uniform average temperature with no 19 individual variations exceeding 25°F. Also, when a WMA additive is included in 20 the asphalt binder, the temperature of the asphalt binder shall not exceed the 21 maximum recommended by the manufacturer of the WMA additive. 22 4. Sampling and Testing of Mineral Materials – The HMA plant shall be equipped 23 with a mechanical sampler for the sampling of the mineral materials. The 24 mechanical sampler shall meet the requirements of Section 1-05.6 for the 25 crushing and screening operation. The Contractor shall provide for the setup and 26 operation of the field testing facilities of the Contracting Agency as provided for in 27 Section 3-01.2(2). 28 5. Sampling HMA – The HMA plant shall provide for sampling HMA by one of the 29 following methods: 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. 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 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 39 loading to unloading exceeds 30 minutes, the cover shall be securely attached to protect 40 the HMA. 41 42 The contractor shall provide an environmentally benign means to prevent the HMA 43 mixture from adhering to the hauling equipment. Excess release agent shall be drained 44 prior to filling hauling equipment with HMA. Petroleum derivatives or other coating 45 material that contaminate or alter the characteristics of the HMA shall not be used. For 46 live bed trucks, the conveyer shall be in operation during the process of applying the 47 release agent. 48 49