March 2010: Hot In-place Recycling Project of the Year Award

admin on 23 Mar 2010

Peter’s Bros. Construction Ltd. – Martec’s long term customer and a partner in British Columbia, Canada – has received the prestigious 2009 Roads & Bridges/Asphalt Recycling and Reclaiming Association (ARRA) Award in Hot In-place Recycling category.

Peter’s Bros. has been the owner & operator of Martec’s AR2000 Super Recycler train for the past 15 years. The company successfully recycled millions of square meters of deteriorated asphalt pavement in various regions of British Columbia but even for them a completion of a particular project last summer – the one that is now titled “HIR Project of the Year” – was a challenge.

Congratulations to Peter’s Bros. and gratitude to the ARRA for recognizing excellent results of the HIR technology application in British Columbia, Canada!

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We are glad to share with our visitors an impressive description of Peter’s Bros. Construction Ltd.’s HIR Project of The Year as follows:

Location:	Highway N16, Central British Columbia, Canada
Project Length (feet):	211,200 feet (40 miles, with the recycled area of approximately 2,691,000 sq feet)
% Recycled Asphalt Pavement (RAP) Used:	100
Milling depth of cut (inches):	2
Cost savings by recycling ($):	US$1,719,690 (CAN$2,000,000.00) over conventional Mill & Fill
Recycling Type:	Hot In-Place Recycling
Start Date:	June 1, 2008
Finish Date:	August 12, 2008
Project challenges:	25 year old road; alligated, very poor old asphalt; 20%-25% admix was required; mountainous region; remote location; rainy and cold days during the project execution, with average minimum ambient temperature ranging from 3.8°C (38.8°F) in June to 5.7°C (42.3°F) in August.

FAQ

admin on 01 Dec 2009

Martec’s Answers on Frequently Asked Questions Related to HIR Suitability

What is the typical Hot-In-Place Asphalt Recycling road candidate?

Alligator cracking

longitudinal cracking

low spots

the requirement for profiling

These are good candidates as long as the road has sound base and adequate drainage. A good candidate can be determined by the following:

Visual observation

Drill cores — check aggregate and oil content

Review records to determine the type of materials that were previously used to make original road

What is not an ideal candidate for Hot-In-Place Asphalt Recycling?

Excessive amounts of sub base failure

Thickness of less than 2” (50 mm)

Wide or excessively deep cracking

Poor or soft aggregates

Aggregates predominantly larger than ¾” (20 mm)

Low oil content — less than 4% (although this can be compensated for)

Stripping

Many recent projects that exhibited some of the above characteristics have been corrected with proper engineering and workmanship. Fix the excessive damage first!

Can Hot-In-Place Asphalt Recycling be used in cities where there are lots of turns, manholes, casting, water valves and curbs?

HIR used to be reserved for major highways, municipal roads and airports, but it is now being used more in the city. We provide minimal traffic delays and less congestion as typically only 1/5 of the asphalt trucks are required. With production rates as high as 1,400 sqm / hr we offer the perfect solution to a busy city.
Typically we accomplish 2 to 3 lane kilometers of rehabilitation work per day in the city. Our single lane process impresses the traveling public (which reflects well on the governments that chose this method).

Does the recycled road need to be overlaid?

No. The AR2000 produces asphalt of compressible or better quality than new asphalt although many of our competitors are forced to overlay their work due to the quality of asphalt produced by their machinery (typically due to age hardening of the bitumen caused by excessive heat or burning).

Does admix always have to be utilized?

Almost always. If the road has sunken or fallen 10% to 30% new asphalt is added to the recycled material to bring the road back up to grade. This creates a smoother road, and the road will have a higher load rating.

Can you recycle the road at night?

Yes, however production rates slow down because when the ambient air temperature is lower and much more care has to be taken with paving and compacting due to low light.