Operating principle of ancillary equipment

The modern laboratory-scale foamed bitumen plant and laboratory-scale twin-shaft compulsory mixer – here is how it works.

Producing foamed bitumen of high quality
Simple, intuitive operating concept
Mobile design
Efficient manufacture of test specimens
Perfect mixes

One-to-one simulation of the cold recycling process in the lab

Foamed bitumen is used to an ever-increasing extent as an economical binder in cold recycling. Preliminary testing with the mobile WLB 10 S laboratory plant enables the foamed bitumen quality to be precisely determined in the laboratory even prior to the start of construction. Extremely simple handling permits different parameters, such as water quantity, pressure and temperature, to be varied quickly, and different types of foamed bitumen to be produced within a short period of time. Based on the results achieved, the WLM 30 laboratory mixer can then be used to determine the mix proportion and to define the optimum bitumen foam for production of the test specimens. The integrated air compressor enables the plant to be operated even in those locations where there is no external supply of compressed air. The plant can also be used to test the suitability of mixes by adding cement or lime in combination with foamed bitumen.

Mixes every bit as homogeneous as on the construction site

Direct injection of the foamed bitumen into the mixing chamber of the WLM 30 laboratory mixer enables mixes to be processed to specification and test specimens to be produced. The twin-shaft compulsory mixer is not only perfectly matched to the laboratory plant in terms of performance and design, however, but is also connected to the plant’s power supply. The high mixing intensity matches that of continuous mixers used on the construction site. The WLM 30 has a capacity of approx. 30 kg, and additionally offers variable settings for speed and mixing time. The mixing chamber is simply pivoted downwards about 180° and the cover opened to allow discharge of the mix. And what’s more: when used separately, the WLM 30 is suitable for most diverse mix proportions.

Quality assurance even prior to the start of construction

Preliminary testing includes the procurement of source materials, determination of the mix formula, and suitability testing on the test specimens. Using the WLB 10 S and WLM 30 laboratory plants permits the final pavement design to be determined in advance. The two machines ensure an accurate analysis of mixes produced from granulated asphalt, virgin materials or a mixture of both. Our broad, innovative product portfolio enables us to rehabilitate roads with maximum reliability and economic efficiency.