Frequently asked questions

What is MPRS®?

MPRS® is a road maintenance system for spot-wise hot paving. It consists of a mini asphalt batch plant and a ready to use asphalt pellet (Pave Repair LA).

Who is behind MPRS®?

MPRS® was developed by the company Carl Ungewitter Trinidad Lake Asphalt GmbH & Co. KG. It is produced in our company-own production facilities and promoted by our sales team. According to our quality standards we operate independent and certified production control processes.

When and where MPRS® can be used?

Generally, the system can be used regardless from any weather conditions with just a few preparation steps. The same is valid for the repair spots (f.e. potholes) if the underlayment and its surrounding is still solid and stable.

How can I get a mini batch plant?

The mini asphalt batch plant is just available in a periodical leasing model. Pave Repair LA can be ordered individually and on demand.

How is the mini batch plant operated?

The mini batch plant is operated with standard gas bottles (propane/butane) and with a pressure regulator at approx. 1,5 bar.

How fast and which quantities of hot mix can the mini batch plant operate?

Depending on the weather conditions and the type of batch plant they can handle batch sizes of 10 to 150 kg in time slots of 5 to 20 minutes once they are in operating mode.

What is Pave Repair LA?

Pave Repair LA is an asphalt pellet especially developed for MPRS®. The modified asphalt mix has excellent compaction properties and a high resistance against deformation.

How long is Pave Repair LA storable?

At cool and dry ambient conditions Pave Repair LA has an unlimited shelf life. No solvents or other restricting substances are used.

When is the hot mix asphalt ready to use?

As soon as the asphalt pellet (white-grey colour as delivered) is heated up sufficiently it turns the colour to shiny black, which means it is ready to pave. The mixing temperature range should be at 130 to 180 °C.

Which layer thickness is possible in minimum and maximum with Pave Repair LA?

Based on the maximum grain size of 5 or 2 mm you can pave layers of 0.5 to 3 cm thickness. If you have deeply penetrating road damages you can stack up Pave Repair LA layer-wise to the needed depth.

How do I pave and process Pave Repair LA?

  • step 1: clean the pothole and dry it if needed
  • step 2: at the same time set the mini batch plant in operating mode
  • step 3: treat the pothole with a primer
  • step 4: fill in Pave Repair LA into the mini batch plant parallel to step 3
  • step 5: pave the hot mix asphalt to the pothole and compact (if needed layer-wise)
  • step 6: grit/sand the new surface and release it to traffic shortly after

Which equipment do I need for compaction?

Pave Repair LA is designed to achieve the optimum compaction sufficiently with a hand rammer. The useful compaction equipment should be selected accordingly to the size of the paved surface.

When can I release a repair spot to traffic?

You can open a maintained road surface to traffic directly after paving and compacting. According to the paving depth and surface the time can vary slightly. Top-tip: carefully spray water to the paved surface to cool it down faster.

What happens with remaining material, is it re-usable?

If Pave Repair LA is not cooled down and solidified completely you can simply put it back into the mini batch plant for re-using. Top-tip: If you don’t need remaining material this day, stir the hot mix in the bucket with a spattle during cooling process to loosen it up. In loose/granulated shape you can use it the next day or later again, even if it already was heated in a former process.

How long asphalt can remain within the batch plant?

Once the mini batch plant is heated up and filled with freshly produced asphalt the time window is 20 – 40 minutes, depending on the ambient temperatures and seasonal weather conditions. If you fear to miss the processing time window you can intermediately reheat the device or release the material for later use.

What to do if I forgot material within the mini batch plant and it becomes solid?

Heat up the mini batch plant slowly and carefully until the remaining Pave Repair LA gets soft. As soon as the screw conveyor is able to rotate again the normal preparation process can be continued.

How can I clean the mini batch plant?

Depending on the degree of impurity the mini batch plant can be cleaned inside with gritting material (pure chippings). Fill in some gritting material to the drum after usage if the device is still warm, stir multiple times back and forth and release the chippings.