Bitumen quality control tests
The bitumen used should be homogeneous and should not foam when heated to 176 degrees Celsius.
Oil or steam pipes or electrical appliances should be used to heat the bitumen. The monitoring device is obliged to prevent the evacuation of bitumen of tankers that use direct flame for heating, and the contractor must also refrain from evacuating the bitumen of such separate tanks.
The temperature of bitumen in tanks and pipes and when mixing with aggregates in the asphalt plant mixer should not exceed 175 degrees Celsius for pure bitumen.
Bitumen transport tanks as well as workshop bitumen tanks must be equipped with a thermometer. One thermometer is installed at the bottom of the tanker and another at the top. In the asphalt factory, a thermometer for bitumen must be installed so that the temperature of the bitumen can be controlled at any time.
Bitumen is stored in metal tanks and concrete pools in the workshop.
If the pool is used, the floor and walls should be concrete and the roof should be covered so that the bitumen is completely protected from dust, rain and other contaminants. Bitumen heating equipment should be provided on the pool floor.
The bitumen required for each stage of asphalt production should not last more than 15 seconds after the start of the bitumen discharge process.
Bitumen measuring instruments must measure the required bitumen that is emptied at each stage to the nearest 1 kg.
To quickly identify the basic properties of bitumen, some penetration-based grading tests are used. Stain testing is also used for this purpose.
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