Laboratory foamed bitumen plant WLB 10 S and twin-shaft compulsory mixer WLM 30. Preliminary testing to determine the mix quality.

Transcription

1 Laboratory foamed bitumen plant WLB 10 S and twin-shaft compulsory mixer WLM 30 Preliminary testing to determine the mix quality.

2 02 03 Outstanding features of the WLB 10 S and WLM 30 3 BITUMEN INJECTION NOZZLE Special, high-precision bitumen injection nozzle with expansion chamber to ensure optimum bitumen foaming behaviour. 4 FOAMED BITUMEN PRODUCTION Production of foamed bitumen samples in the laboratory. 3 2 TWIN-SHAFT COMPULSORY MIXER Powerful laboratory mixer for optimum, real-life mixing results. 2 1 MOBILE DESIGN Simple, flexible handling of the plant in the laboratory.

3 5 FULLY HEATED BITUMEN SYSTEM All components transporting hot bitumen are heated to ensure ideal sample production. 7 6 VARIATION OF PARAMETERS Precise adjustment of pressure, temperature, water and bitumen addition to achieve the ideal foamed bitumen quality SIMPLE OPERATING CONCEPT Straightforward, intuitive operation AIR COMPRESSOR Separate air compressor to ensure independence of external compressed air systems. 9 DISCHARGE NOZZLE Readily accessible discharge nozzle for easy drainage of the bitumen container.

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5 More control. Improved quality. COLD RECYCLING PROJECTS USING FOAMED BITUMEN ARE MULTI-FACETED, SOME EVEN PRESENTING A CHALLENGE. GOOD TO BE ABLE TO COVER ALL BASES. WIRTGEN PROVIDES NUMEROUS TECHNI- CAL INNOVATIONS HELPING YOU TO REACH YOUR GOAL SAFELY AND EFFICIENTLY. THE LABORATORY FOAMED BITUMEN PLANT WILL ENABLE YOU TO CONQUER EVEN THE MOST CHALLENGING TERRI- TORY: SOUND QUALITY AND PROCESS RELIABILITY EVEN PRIOR TO THE START OF CONSTRUCTION. SIMULATING FIELD CONDITIONS IN THE LABORATORY. WIRTGEN A PIONEER IN FOAMED BITUMEN.

6 Hot bitumen Air Water Foamed bitumen The foamed bitumen exiting through the nozzle at the expansion chamber is suitable for direct mixing with the mineral aggregate mixture. What is foamed bitumen? FOR HIGH-QUALITY BASE LAYERS scribed in terms of the parameters expansion FROM COLD MIXES ratio and half-life. The larger its expansion and the higher its half-life, the better suited to Foamed bitumen is produced from standard grade bitumen used in asphalt road processing the foamed bitumen will be. construction. When heated and foamed, Compared to other binding agents, foamed bitumen permits the economical production bitumen offers the advantage of reduced of high-quality base layers from cold mixes. transport and material costs. Bitumen used for Foamed bitumen is produced by injecting the production of foamed bitumen is readily small quantities of water and compressed air available in all parts of the world. into hot bitumen. The water evaporates, causing the bitumen to foam abruptly and expand to around 15 to 20 times its original volume. The quality of foamed bitumen is primarily de-

7 The foaming process takes place in expansion chambers where water and air are injected into hot bitumen (160 C to 180 C) at a pressure of approx. 5 bar. 3 Development of half-life and expansion ratio to determine the water content Expansion ratio Half-life Expansion ratio Half-life (s) Water content (% by weight)

8 The compact plant ensures ergonomically optimized handling and ease of operation. Determining the optimum foamed bitumen quality 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.

9 2 3 2 The clearly and logically structured control panel permits easy setting and monitoring of key parameters. 4 3 Controlled electrically: the plant offers maximum accuracy, for example, by calibrating the bitumen flow. 4 Precise process water settings enable the ideal foamed bitumen quality to be determined.

10 10 11 WLM 30 laboratory mixer for the production of cold mixes The powerful mixer with heavy-duty blades produces a wide variety of cold mixes. 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.

11 Quality assurance even prior to the start of construction MAXIMUM RELIABILITY FOR YOUR COLD RECYCLING PROJECT 1 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. 2 1 Specimens for suitability testing, produced from freshly manufactured cold mix. 2 Quality testing by means of the indirect tensile strength test. 3 Ideal pavement properties are ensured by precisely determining the mix proportion. 3

12 Illustrations and texts are non-binding and may include customized fittings. Subject to technical changes. Performance data depend on operational conditions. Nr EN-02/16 by WIRTGEN GmbH Printed in Germany. WIRTGEN GmbH Reinhard-Wirtgen-Str Windhagen Germany Phone: +49 (0) / Fax: +49 (0) / Internet: info@wirtgen.com