Foamed bitumen
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A WIRTGEN GROUP COMPANY A WIRTGEN GROUP COMPANY Binder with a proven track record worldwide

Fit for the future with foamed bitumen. HIGH-QUALITY, COST-EFFICIENT, ENVIRONMENTALLY FRIENDLY. AND FUTURE-PROOF: COLD RECYCLING WITH FOAMED BITUMEN, THE INNOVATIVE BINDING AGENT. INEXTRICABLY TIED TO THE NAME OF WIRTGEN, THE PIONEER IN FOAMED BITUMEN. OUR VISION TO FULLY REALIZE THE POTENTIAL INHERENT IN THE FOAMED BITUMEN TECHNOLOGY HAS MATURED INTO MANY YEARS OF PROVEN EXPERTISE AND EXPERIENCE. ALWAYS IN LINE WITH CUSTOMER REQUIREMENTS. CLOSE TO OUR CUSTOMERS. THE ROAD CONSTRUCTION MATERIAL OF TOMORROW HAS SCORED TOP MARKS WITH COUNTLESS USERS AROUND THE GLOBE EVEN TODAY.

CONTENTS SOPHISTICATED PROCESS, PERFECT RESULTS HISTORY OF THE FOAMED BITUMEN TECHNOLOGY FOAMED BITUMEN HAS GAINED ACCEPTANCE WORLDWIDE PRODUCTION OF FOAMED BITUMEN IN THE LABORATORY PROPERTIES OF BSM (BITUMEN-STABILIZED MATERIAL) USE ON THE CONSTRUCTION SITE – IN-SITU OR IN-PLANT COLD MIXES CONTAINING FOAMED BITUMEN EXAMPLES OF BSM LAYERS IN THE PAVEMENT STRUCTURE WIDE RANGE OF APPLICATIONS FROM A SINGLE SOURCE MATERIALS COMPLYING WITH THE STRICTEST ENVIRONMENTAL STANDARDS FULL RANGE OF PROFESSIONAL SUPPOR

The foamed bitumen is injected into the mixing chamber in precisely metered quantities via special injection systems. Microprocessors ... Sophisticated process – perfect results A BINDING AGENT OFFERING LOTS OF POTENTIAL Cold recycling with foamed bitumen has become an established technology worldwide and is now increasingly moving into the focus of road authorities and construction companies for use in the rehabilitation and new construction of road pavements. ... govern the process across the full working width and in accordance with the recycler’s advance speed and recycling depth. Cold...

INJECTION OF FOAMED BITUMEN AND WATER INTO THE AGGREGATE VIA SEPARATE INJECTION SYSTEMS Working direction PRODUCING FOAMED BITUMEN Foamed bitumen Foamed bitumen is produced by foaming standard road-grade bitumen. In the process, small amounts of water and air are injected into the hot bitumen at high pressure, which results in the bitumen foaming and expanding to around 20 times its original volume. The bitumen foam is then injected into a mixer via injection nozzles. It is eminently suitable for mixing with cold and moist construction materials. The new material – frequently produced using...

History of the foamed bitumen technology WIRTGEN – A PIONEER IN FOAMED BITUMEN In 1956, Professor Ladis Csanyi from Iowa State University (USA) was the first to recognize the suitability of foamed bitumen for use as a binding agent. This technology was later refined by Mobil Oil. Mobil Oil developed the first expansion chamber in which bitumen was mixed with water to produce bitumen foam. WIRTGEN has taken the lead in the industry since the 1990s in working with this innovative binding agent. Integrating the system into the WIRTGEN recyclers in 1995 finally sparked the interest of industry...

oamed bitumen has gained ptance worldwide AN INTERNATIONALLY ESTABLISHED TECHNOLOGY • • • • • mmTTf The success and approval gained in over 90 countries and across almost all climates reflect the high level of acceptance for the use of foamed bitumen as a binding agent. The technology is preferably used wherever road pavements are exposed to high traffic volumes or particularly economical and sustainable construction is required. The foamed bitumen technology offers a truly forward-thinking solution and is used in both structural rehabilitation and new construction projects. Mixes...

IN EXCESS OF 100 MILLION SQUARE METRES HAVE MEANWHILE BEEN RECYCLED IN NUMEROUS COUNTRIES AROUND THE WORLD USING FOAMED BITUMEN AS A BINDING AGENT.

Small amounts of water cause an abrupt increase in volume of the hot bitumen (foamed bitumen). Production of foamed b ­ itumen in the laboratory DETERMINING THE FOAMED BITUMEN QUALITY IN ADVANCE Preliminary testing with the mobile WLB 10 S foamed bitumen laboratory unit enables the foamed bitumen quality to be precisely determined in the laboratory even prior to the start of construction. Extremely simple handling enables parameters such as the water quantity, air pressure and temperature to be varied quickly and easily. The quality of foamed bitumen is primarily described in terms of its...

THE MIX MAKES ALL THE DIFFERENCE The WLB 10 S foamed bitumen laboratory unit is used for: > general testing of the types of bitumen used to determine their suitability for the foaming process. > optimizing the foaming process by adjusting the temperature and the quantity of water to be added. > mix production in the laboratory using different rates of bitumen application. For mix production in the road laboratory, the WLB 10 S is connected directly to the WLM 30 twin-shaft pugmill mixer. The foamed bitumen produced by the WLB 10 S is then injected into the mixing process taking place in the...

Properties of BSM (bitumen-stabilized material) USING BSMS IN THE FIELD Easy workability is one of the distinctive features of BSM mixes. When sufficiently moist, there are no time limitations for the subsequent compaction process. Yet another very important hallmark of BSM layers is that they can be opened to traffic temporarily immediately after completion. In many cases, the cold recycled layer is simply surfaced with a thin asphalt layer serving as a wearing course. Road maintenance interventions also focus on the asphalt surface course, leaving the cold recycled layer undisturbed. This...

Addition of: 2.2 % bitumen 1.0 % cement (identical density and moisture content) AGGREGATE CRUSHED AS PER GRADING CURVE BITUMEN-STABILIZED MATERIAL Material treated with foamed bitumen is distinctive for its optimal strength and bearing ca

Use on the construction site – in-situ or in-plant COLD RECYCLING IN-SITU When cold recycling in-situ, a cold recycler granulates the damaged road pavement while at the same time mixing in foamed bitumen, water and cement in the required quantities. This method produces a new, homogeneous construction material (BSM) in a single operation. The in-situ cold recyclers are equipped with a powerful milling and mixing rotor and an injection system. Cold recycling with foamed bitumen can be performed either in-situ (on site) or in-plant (in a mixing plant). Some models are additionally fitted with...