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Edgewater Creek Bridge Replacement November 2023 100 Plants used for the preparation of HMA shall conform to the following requirements: 1 2 1. Equipment for Preparation of Asphalt Binder – Tanks for the storage of 3 asphalt binder shall be equipped to heat and hold the material at the required 4 temperatures. The heating shall be accomplished by steam coils, electricity, or 5 other approved means so that no flame shall be in contact with the storage tank. 6 The circulating system for the asphalt binder shall be designed to ensure proper 7 and continuous circulation during the operating period. A valve for the purpose of 8 sampling the asphalt binder shall be placed in either the storage tank or in the 9 supply line to the mixer. 10 2. Thermometric Equipment – An armored thermometer, capable of detecting 11 temperature ranges expected in the HMA mix, shall be fixed in the asphalt binder 12 feed line at a location near the charging valve at the mixer unit. The thermometer 13 location shall be convenient and safe for access by Inspectors. The plant shall 14 also be equipped with an approved dial-scale thermometer, a mercury actuated 15 thermometer, an electric pyrometer, or another approved thermometric 16 instrument placed at the discharge chute of the drier to automatically register or 17 indicate the temperature of the heated aggregates. This device shall be in full 18 view of the plant operator. 19 3. Heating of Asphalt Binder – The temperature of the asphalt binder shall not 20 exceed the maximum recommended by the asphalt binder manufacturer nor shall 21 it be below the minimum temperature required to maintain the asphalt binder in a 22 homogeneous state. The asphalt binder shall be heated in a manner that will 23 avoid local variations in heating. The heating method shall provide a continuous 24 supply of asphalt binder to the mixer at a uniform average temperature with no 25 individual variations exceeding 25°F. Also, when a WMA additive is included in 26 the asphalt binder, the temperature of the asphalt binder shall not exceed the 27 maximum recommended by the manufacturer of the WMA additive. 28 4. Sampling and Testing of Mineral Materials – The HMA plant shall be equipped 29 with a mechanical sampler for the sampling of the mineral materials. The 30 mechanical sampler shall meet the requirements of Section 1-05.6 for the 31 crushing and screening operation. The Contractor shall provide for the setup and 32 operation of the field testing facilities of the Contracting Agency as provided for in 33 Section 3-01.2(2). 34 5. Sampling HMA – The HMA plant shall provide for sampling HMA by one of the 35 following methods: 36 a. A mechanical sampling device attached to the HMA plant. 37 b. Platforms or devices to enable sampling from the hauling vehicle without 38 entering the hauling vehicle. 39 40 5-04.3(3)B Hauling Equipment 41 Trucks used for hauling HMA shall have tight, clean, smooth metal beds and shall have a 42 cover of canvas or other suitable material of sufficient size to protect the mixture from 43 adverse weather. Whenever the weather conditions during the work shift include, or are 44 forecast to include, precipitation or an air temperature less than 45°F or when time from 45 loading to unloading exceeds 30 minutes, the cover shall be securely attached to protect 46 the HMA. 47 48