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Hot In Place Asphalt Recycling (HIPAR)
The Need
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With limited funds destined to highway
maintenance, the need to repair and maintain highways at the lowest cost possible has
created a need for cost-effective ways to rehabilitate existing pavements in preference of
reconstruction. While traditional methods of resurfacing roadways produce good results,
they are time and resource demanding. |
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The Technology
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Hot-In-Place-Asphalt-Recycling
is defined as a process of correcting asphalt pavement surface distress by softening the
existing surface with heat, mechanically removing the pavement surface, mixing with
recycling agent, possibly adding virgin asphalt and/or aggregate and replace it on the
pavement without removing the recycled material from the original pavement site.
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HIPAR has been used in Canada and
Europe. It is now starting to be implemented in the U.S. The recycling of existing asphalt
returns the pavement to a near new condition, giving many more years of life at a reduced
cost over normal reconstruction processes. Recycling of granular pavements using
specialized equipment has lead to much better surface finished and consistently good
performance in recent years. The additives used in the process are lime, cement, slag, fly
ash, and various blends of these materials. The
pavement surface is heated by infrared radiation and milled in two steps to a desired
depth, 20-65 mm. The mix of the old asphalt layer can be changed directly by adding virgin
asphalt and new type of bitumen or rejuvenator. The two-stage recycling means the
sequential heating and removing of two separate layers of asphalt in one continuous
operation. Alternatively working widths are 3,5 m and 4,2 m |
The Benefits
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HIPAR technology offers
tremendous benefits in terms of cost savings in material, labor, and a reduction in
duration of the repair activities. Another great benefit from HIPAR is that it can turn a
traditionally environmentally damaging process into a process having only minimal
environmental effects.Materials savings are realized from the reduction in new asphalt and
aggregate. Energy savings result primarily from reduced aggregate haul and drying, and
asphalt transportation. Cost savings are greatly influenced by length of aggregate haul
and distance from the plant to the job site. Other factors which have a major influence on
bid prices are the degree to which contractors in the area are familiar with and equipped
for recycling, the size of the State's present and projected recycling program, and State
contract procedures. |
Status
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HIPAR technology has been used
for some time in Europe and Canada. States like Colorado have started the implementation
of HIPAR in their highway renovation and maintenance programs. The equipment required to
implement this system is available through several vendors like Pyrotech Asphalt Mfg.Co.
Ltd. |
Barriers
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The equipment required to
perform recycling operations of asphalt is very costly. This technology hasn't had a great
impact yet because of a greater emphasis on concrete pavements over asphalt pavements.
HIPAR technology has not been used in any major U.S. Highway until recently (Interstate
I-70, Eisenhower Tunnel -- Continental Divide). |
Points of Contact
- Andrew Buechi, Can International Enterprises
Ltd.,3006-C Spring Street, Port Moody, B.C. V3H 1Z8, Phone: (604) 469-7814, Fax: (604)
469-3038.
Email: andi_buechi@bc.sympatico.ca
- ARC Asphalt Recycling, 4475 Viewmont Avenue
- #101, Victoria, B.C. Canada, V8Z 6L8 Phone: (250) 727-7388, Fax: (250) 727-7313, Email: arcasphalt@islandnet.com
- Beauchemin-Beaton-Lapointe Inc., 2045
Stanley Street, Montreal, Quebec, H3A 2V4, Canada.
- Rob Bowerman, Sales
Representative, HIP Recycling Inc., 85 Passmore Ave, P.O. Box 272,
Agincourt, Ontario M1V 4S9, Canada
Email: hiprbowerman@aol.com Tel:
(800) 272-0529 Fax: (416) 291-3252
http://www.hiprecycling.com/
References
- Pyrotech Asphalt Equipment Mfg. Co. Ltd.
Disclaimer Statement
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Neither the Construction
Industry Institute nor Purdue University in any way endorses this
technology or represents
that the information presented can be relied upon without further investigation. |
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