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Densiphalt^® - A strong and joint free pavement for airport areas

One of the challenges facing engineers involved in airport planning is design and construction of durable, low-maintenance and economical pavements. As traffic intensity, axle loads, tyre pressures and aircraft size continue to increase, so does the demand for improved airfield pavements. Since 1988 Densit a/s has supplied cost-effective Densiphalt^® pavement solutions for airports world wide.

Densiphalt^® is a composite paving material that combines the flexible properties of asphalt with the static bearing capacity and durability of concrete. It consists of an open-graded asphalt with the voids filled with high-strength cement-based mortar. Densiphalt^® is applied as a 30-100 mm layer and is laid on an adequate base course such as asphalt, lean-mix concrete or standard concrete. The curing time of Densiphalt^® is 24 hours at 20°C.

It is vital for an airport and its airlines that the pavements are able to withstand heavily channelled traffic, long-term parking and fuel spills with minimum maintenance and minimum downtime.

The high strength of the Densiphalt^® pavement makes it able to withstand high stresses and static loads avoiding rutting and dents. Densiphalt^® is impermeable and has a good chemical resistance to, for example jet fuel and de-icing liquids and it fulfils the environmental standards.

The jointfree Densiphalt^® pavement ensures a long-term solution, minimum of maintenance and the rapid setting time (24 hours / 20°C) makes Densiphalt^® an excellent choice when time is crucial.

During the last 15 years Densiphalt^® has been successfully installed in airports around the world. Applications include aprons, de-icing areas, pushback areas, taxi-holding positions, refuelling pads, runway ends and holding bays.

Case history:  Burlington International Airport - Vermont, U.S.

Reinforced Densiphalt^®

The construction of Densiphalt^® can be further improved by introducing steel reinforcement, achieving a significant increase in the load bearing capacity.

Laboratory experiments using 4-point bending beam test on Reinforced Densiphalt^® pavement samples show that the stiffness modulus increases up to 70% compared to Densiphalt^® without steel reinforcement.

The steel reinforcement has shown to further improve the rut resistance and thus enable the use on areas with traditional asphalt layers that need partial repairs due to extreme rutting or point loads.

Fig. 1 Rutting Test (Click on image to enlarge)

As shown in the diagram (fig. 1), both Densiphalt^® pavement structures show significant higher rut resistance compared to traditional asphalt materials, making Densiphalt^® the perfect choice for use on heavy-duty loaded areas.

Reinforced Densiphalt^® is a patented pavement solution (WO 02075052).

Recently Reinforced Densiphalt^® has been applied in several airports on areas exposed to very high static loads and continues heavy traffic. In areas where asphalt is proven to be the most ideal bearing course, Reinforced Densiphalt^® can be applied locally on areas exposed to very high loads in order to prevent dents or rutting, minimising maintenance costs.

A customised pavement

In a co-operation with contracting and consulting partners world wide, Densit offers airports:

• An individually customised Densiphalt^® pavement design
• Installation of Densiphalt^®
• 17 years of experience with semi-flexible pavements

Densit A/S, are participating in InterAirport Munich 11-14th October - Hall 4A, stand Q4'.

For more information or further questions please do not hesitate to contact us.

Densit a/s
Rørdalsvej 44
DK – 9220 Aalborg SV

Tel: +45 9816 7011
Fax: +45 9933 7788
E-mail: mail@densit.com
Website: www.densit.com

 

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