Operating principle of ancillary equipment

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

  1. Air compressor

    Separate air compressor to ensure independence of external compressed air systems.

  2. Foamed bitumen production

    Production of foamed bitumen samples in the laboratory.

  3. Fully heated bitumen system

    All components transporting hot bitumen are heated to ensure ideal sample production.

  4. Variation of parameters

    Precise adjustment of pressure, temperature, water and bitumen addition to achieve the ideal foamed bitumen quality.

  5. Bitumen injection nozzle

    Special, high-precision bitumen injection nozzle with expansion chamber to ensure optimum bitumen foaming behaviour.

  6. Twin-shaft compulsory mixer

    Powerful laboratory mixer for optimum, real-life mixing results.

  7. Simple operating concept

    Straightforward, intuitive operation.

  8. Mobile design

    Simple, flexible handling of the plant in the laboratory.

  9. Discharge nozzle

    Readily accessible discharge nozzle for easy drainage of the bitumen container.

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.

The clearly and logically structured control panel permits easy setting and monitoring of key parameters.

The clearly and logically structured control panel permits easy setting and monitoring of key parameters.

Controlled electrically: the plant offers maximum accuracy, for example, by calibrating the bitumen flow.

Controlled electrically: the plant offers maximum accuracy, for example, by calibrating the bitumen flow.

Precise process water settings enable the ideal foamed bitumen quality to be determined.

Precise process water settings enable the ideal foamed bitumen quality to be determined.

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.

Der kraftvolle Mischer mit robusten Paddeln erzeugt vielseitige Mischgüter.

Der kraftvolle Mischer mit robusten Paddeln erzeugt vielseitige Mischgüter.

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.

Specimens for suitability testing, produced from freshly manufactured cold mix.

Specimens for suitability testing, produced from freshly manufactured cold mix.

Quality testing by means of the indirect tensile strength test.

Quality testing by means of the indirect tensile strength test.

Ideal pavement properties are ensured by precisely determining the mix proportion.

Ideal pavement properties are ensured by precisely determining the mix proportion.

Market-leading and cutting-edge products for the Road and Mineral Technologies business sectors are constructed at the WIRTGEN brand headquarters in Windhagen, Rhineland-Palatinate. With its innovative, high-performance and cost-efficient products and technologies for cold milling, soil stabilization, hot and cold recycling, concrete paving and surface mining, WIRTGEN leads the world market in road construction and repair, as well as in mining natural rock and pay minerals.

© 2017 WIRTGEN GmbH