A step forward in Concrete Technology

A photo of all the the ConTec Viscometers:
From left:  Visco5, Visco4, BML, Visco6.
  The BML-Viscometer        

  BML-Viscometer     Visco-4    Visco-4 SCC    Visco 5      Visco 6



  About us










Con Tec offers 4 (5) types of Viscometers

  • ConTec BML Viscometer 3  -  for mortar and concrete
  • ConTec Viscometer 4  -  for paste and mortar
  • ConTec Viscometer 4 SCC  -  modified to test also SCC
  • ConTec Viscometer 5  -  for mortar and concrete
  • ConTec Viscometer 6  -  for paste and mortar

Test report
To estamate the accuracy, the ConTec viscometers (with wide range of radius of inner and outer cylinders as well as the height of the inner cylinder) have been tested with commercial oil, CylEsso 100.
More information (pdf-file)



Is a coaxial cylinder viscometer for course particle suspension that is suitable to mesure the rheological properties of cement paste, mortar and concrete with 80 mm slump or higher. When stiffer concrete is tested the coaxial cylinder unit is replaced by blade impeller system.

The rheological properties are described by the fundamental parameters in the Bingham model, the yield value and the plastic viscosity. They are calculated by modified Reiner-Rivlin equation or for concrete, by Plugg equation. One can also choose to use the values G and H instead of the Bingham parameters, and they are often preferred as they are simpler and easier to implement.

The calculation process also qualifies the proneness of the concrete-mix to segregate by the segragation factor (S),  which can be considered as the change in viscosity during testing.   The specified performance range of the BML-viscometer is for torque 0,27 Nm - 27 Nm and for rotation velocity 0,1 revolutions per second (rps) - 0,6 rps under normal testing conditions. The absolute range for both the velocity and the torque can be optionally adjusted. For the WO-2 model the rotation velocity range is 0,05 rps - 0,65 rps and the torque range is 0,27 Nm - 28,2 Nm. The later model WO-3, an enhanced version of the WO-2 model, has an extended performance range for rotation velocity of 0,0022 rps - 0,85 rps and torque range of 0 - 60 Nm.  The very low rotation velocity of the WO-3 model makes it possible to measure the stress-deformation curve og the sample mix, an important factor regarding consolidation of concrete.  The high torque range of the WO-3 model is absolutely necessary when testing high performance concrete.

The BLM-Viscometer is constructed of heavy gauge steel plates on a steel frame to withstand the environment in cement and concrete production plants or construction sites. Optionally the instrument can be made to operate under temperatures from -15 to +60C.

The total testing time normally takes about 3 - 4 minutes, i.e. the time from filling the outer cylinder until it is emptied again.  During this period the concrete is exposed to direct movement for only 75 seconds in a standard test procedure.
About the measuring cystems for BML-Viscometer (pdf-file)


Viscometer 4
A viscometer to measure the theological properties of mortars, cement based repair materials, grout and pastes.
ConTec presents a new type of viscometer which uses the same measurement system as the BML Viscometer for mortar and pastes,  The ConTec Viscometer 4.  It is a coaxial cylinder viscometer with the outer cylinder rotating. 
The inner cylinder is the same as for the BML Viscometer.  A three component unit which consists of a top-ring, bottom unit and upper unit.
The standard inner cylinder is the M-170 measuring system.  The bottom unit of the inner cylinder, is fixed to prevent error due to three-dimensional shearing at the bottom.  The upper unit measures the torque and the top-ring ensures the correct hight of the shearing zone.





Viscometer 4 SCC

Viscometer 4





Viscometer 5
The new ConTec Viscometer 5 for mortar and concrete (Dmax ≤ 25 mm).
Ask for more information:  info@ConTec

Viscometer 6
The new ConTec Viscometer 6 for mortar and paste is much smaller than the other viscometers (Dmax
≤ 5 mm)
Ask for more informatio
n:  info@ConTec

Viscometer 5                               Viscometer 6


See a photo of all the the ConTec Viscometers:
From left:  Viscometer 5, Viscometer 4, Viscometer BML, Viscometer 6.



Laugarasvegur 30 - 104 Reykjavik - Iceland   -  Tel: +354 896 9675  -   E-mail: contec@contec.is