This instrument is designed and made as per T 0711-2011 Standard
Test Method for Theoretical Maximum Specific Gravity of Bituminous
Mixtures(Vacuum process) in JTG E20-2011.It is suitable to
determine the theoretical maximum specific gravity of bituminous
by vacuum process. It is used to design the ratio of bituminous
mixtures, survey the road condition or calculate the void ratio and
of road construction.It is not available to determine the lacunose
bituminous mixtures which water absorption overs 3%.
Main technical features
1.It adopts single chip machine technology to vacuumize, shake,
fill air and relieve pressure automatically.
2.Equipped with a high-accuracy absolute pressure sensor, the
negative pressure can reach 3.7 kPa±0.3 kPa.
3.The working status of the vacuum pump can be reflected by a
4.It equips a water buffer device to prevent the water in the
negative pressure container from flowing into the vacuum pump.
5.It can determine two samples at the same time.Test efficiency is
high.The structure is reasonably designed. It is easy to use.
Main technical specifications
1. Power supply： AC(220±10%)V, 50Hz.
2. Volume of vessel： 4000ml×2
3. Power of vacuum pump： 160W
4. Negative pressure： 3.7 kPa（27.75mmHg）.
Allowable bias is ±0.3 kPa.
5. Power of shaking machine： 30W
6. Dimension： 510mm×520mm×380mm