Construction temperature range of ordinary asphalt mixture?

Ordinary asphalt binder construction temperature should be determined by the viscosity-temperature curve measured at 135 ℃ and 175 ℃ conditions in accordance with the provisions of Table 5.2.2-1. Lack of viscosity-temperature curve data, you can refer to Table 5.2.2-2 range selection, and according to the actual situation to determine the use of high or low values. When the temperature in the table does not match the actual situation, allow appropriate adjustments.

Determine the appropriate temperature of asphalt mixture mixing and compaction temperature Table 5.2.2-1

Viscosity Viscosity of asphalt mixture suitable for mixing Viscosity of asphalt mixture suitable for compaction Measurement method

Observational Viscosity (0.17±0.02)Pa?s (0.28±0.03)Pa?s T 0625

Kinematic Viscosity (170±20)mm2/s (280±30)mm2/s T 0619

Seibert viscosity (85±10)s (140±15)s T 0623

Construction temperature of hot-mix asphalt mixture (℃) Table 5.2.2-2

Construction procedure Marking number of petroleum asphalt

No.50 No.70 No.90 No.110

Asphalt heating temperature 160～170 155～165 150～160 145～155

Mineral heating temperature Gap mixer Aggregate heating temperature is 10～30 higher than asphalt temperature

Continuous mixer Mineral heating temperature is 5～10 higher than asphalt temperature

Asphalt mixture discharge temperature 150～170 145～165 140～155

Asphalt mixture discharge temperature 150～170 145～165 140～155

Asphalt mixing temperature 170 145-165 140-160 135-155

Storage temperature of mix storage silo Temperature during storage does not decrease by more than 10

Temperature of mix disposal Higher than 200 195 190 185

Temperature of transportation to the site Not less than 150 145 140 135

Temperature of mix paving

Not less than normal construction 140-145 140 135

Temperature of mix paving

Temperature of mix paving

Temperature of asphalt piling

Not less than normal construction 140 135 130 125

Low temperature construction 160 150 140 135

Internal temperature of the mix at the beginning of rolling, not less than normal construction 135 130 125 120

Low temperature construction 150 145 135 130

Surface temperature at the end of rolling, not less than steel roller Roller 80 70 65 60

Tire roller 85 80 75 70

Vibratory roller 75 70 60 55

The surface temperature of the road open to traffic is not higher than 50 50 50 45

Note ① asphalt mixture construction temperature is measured by the insertion of digital thermometers with metal detector pin. Surface temperature can be measured by surface contact thermometer. When using infrared thermometer to measure the surface temperature, should be calibrated.

② table not included in the construction temperature of No. 130, No. 160 and No. 30 asphalt determined by the test.

5.2.2.2 Polymer modified asphalt mixture construction temperature according to practical experience and refer to Table 5.2.2-3 selection. Usually appropriate than ordinary asphalt mixture construction temperature increased by 10 ℃ ~ 20 ℃. The use of cold latex directly into the method of modified asphalt mixture, aggregate drying temperature should be further increased.

Normal construction temperature range of polymer modified asphalt mixture (℃) Table 5.2.2-3

Working procedure Polymer modified asphalt varieties

SBS type SBR latex type EVA, PE type

Asphalt heating temperature 160～165

Modified asphalt site production temperature 165～170 - 165～170

Finished modified asphalt heating temperature, not more than 175 - 175

Aggregate heating temperature 190～220 200～210 185～195

Modified asphalt SMA mixture temperature 170～185 160～180 165～180

Maximum mix temperature (waste temperature) 195

Mix storage temperature After mixing and discharging the material to reduce the temperature of not more than 10

Paving temperature of not less than 160

Initial compaction temperature of not less than 150

The surface temperature of the end of the milling temperature of not less than 90

Opening the surface temperature of the road when traffic Not more than 50

Note: ① with Table 5.2.2-2

② when the use of polymer or natural asphalt modified asphalt other than those listed, the construction temperature is determined by the test.

5.2.2.3 SMA mix construction temperature should be depending on the fiber varieties and quantities, the amount of mineral powder, in the modified asphalt mixture on the basis of an appropriate increase.