Transcription of 11.1 Hot Mix Asphalt Plants - US EPA
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11.1 Hot Mix Asphalt Plants - US EPA
3/04 Mineral Products Hot Mix Asphalt General1-3,23, 392-394 Hot mix Asphalt (HMA) paving materials are a mixture of size-graded, high quality aggregate(which can include reclaimed Asphalt pavement [RAP]), and liquid Asphalt cement, which is heated andmixed in measured quantities to produce HMA. Aggregate and RAP (if used) constitute over 92 percentby weight of the total mixture. Aside from the amount and grade of Asphalt cement used, mixcharacteristics are determined by the relative amounts and types of aggregate and RAP used. A certainpercentage of fine aggregate (less than 74 micrometers [ m] in physical diameter) is required for theproduction of good quality mix Asphalt paving materials can be manufactured by: (1) batch mix Plants , (2) continuousmix (mix outside dryer drum) Plants , (3) parallel flow drum mix Plants , and (4) counterflow drum mixplants.
gaseous fuels (natural gas) or fuel oil. However, based upon Department of Energy and limited State inventory information, between 70 and 90 percent of the HMA is produced using natural gas as the fuel to dry and heat the aggregate. 11.1.1.1 Batch Mix Plants ! Figure 11.1-1 shows the batch mix HMA production process. Raw aggregate normally is
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