
- 1 -
I. Description
This instrument is suitable for measuring the theoretical maximum relative density of asphalt mixture
by vacuum method. It is used for asphalt mixture ratio design, road investigation or road construction
quality management to calculate void ratio and compaction degree. Not suitable for asphalt mixtures
with porous aggregates with water absorption greater than 3%.
II. Technical specifications
Power supply
220v±10℅ 50Hz
Vibration motor input power
40w
Handheld digital vacuum gauge, negative pressure range
0 - 100kpa
Test requirement
3.7Kpa(±0.3)
Working mode
manual
Container volume
18000ml Class A negative pressure container
Vibration mode
Continuous vibration
Dimensions
440×440×520
mm
Weight
About 30kg
III. Operation
①
. Connect the equipment to the vacuum pump and vacuum gauge.
②
. Turn on the vacuum gauge. For operation methods, refer to
V.
Digital Vacuum Gauge. The
vacuum gauge displays the current atmospheric pressure and temperature.
③
. Start the vacuum pump and the value of the vacuum gauge decreases. When the observed value
is 3.7kpa (± 0.3), turn off the vacuum pump to maintain the pressure. Start the vibration motor,
observe the bubbles in the container until there are no bubbles, then turn off the vibration
motor(the knob on the left side of the switch is used to set the vibration time). Observe the
vacuum gauge. When the pressure exceeds the range of 3.7Kpa(±0.3), turn on or off the vacuum
pump in time to maintain the pressure.
④
. After the test, open the top switch of the container. Slowly release the pressure to gradually
Summary of Contents for H1820
Page 1: ...I LARGE CAPACITY VACUUM PYCNOMETER SET H1820...
Page 10: ...8...