THE FACTS ABOUT REJUVENATORS AND THE INFRARED RESTORATION PROCESS
Infrared restoration has proven to be the finest method available for repairing the majority of asphalt defects.  It, however, is not the solution for all defects.  Asphalt defects caused by base failures must be repaired by removing and replacing the existing material from the sub base up through the wear course.
THE PROBLEM THE SOLUTION

When using infrared for repairing asphalt there are two important concerns that must be addressed

FIRST:  The existing asphalt pavement that will be recycled has aged over time.  Exposure to the sun and the elements over time oxidized the light oils component in asphalt.

SECOND:  During the infrared heating process, as the temperature of the asphalt is increased to above approximately 375 degrees Fahrenheit, the oxidation of light oils are accelerated.  It is also important to know that at around the 500 degree mark, asphalt will burn (coke) rendering it useless for recycling.

Maltenes are the light oil component of asphaltic cement (AC).  Asphaltenes are the black solids that provide the gluing characteristics of AC.  The maltenes are the medium through which the asphaltenes are dispersed.

The engineers from the Asphalt Institute recommend using a maltenes rejuvenator.  The rejuvenator that we recommend using in conjunction with the Infrared Restoration Process is a product called Cyclogen LE.  Cyclogen is a maltenes rejuvenator.  Therefore, by adding Cyclogen to the asphalt after it has been heated you are overcoming the two possible causes of problems.  You are replacing the portion of the asphalt that has been compromised by either natural aging or the heating process.

INFRARED RESTORATION OF UTILITY OPENINGS
BENEFITS DECISION MAKER
Seamless Repair - Prevents water from infiltrating.
Settlement - Because the infrared restoration is made 90 days after the repair is made future settlement is unlikely.
Cost - Infrared restorations are much less expensive then mill and replace repairs.
Convenience - Infrared restorations are quicker to install and much less disruptive to traffic.
Customer Satisfaction - Only infrared restoration returns the street to "like new" condition.  It is ideal for moratorium roads.
Typically each Municipality dictates how they want their streets restored after being opened by a utility company.  By putting a requirement to use infrared restoration into their ordinance, the Municipality benefits from a superior repair to their streets at no cost to them.
Utility companies benefit by being allowed to open streets that are on a moratorium list.
Utility companies enjoy a much improved level of customer satisfaction. (Less complaints and call backs)
 BENEFITS OF INFRARED RESTORATION vs. CONVENTIONAL R&R
FASTER 25 minute repair means minimal disruption to traffic.
NO COLD JOINTS Prevents future entryway for water (future pothole)
LESS MANPOWER 2 or 3 man crew.
LESS EQUIPMENT One unit - One truck
LESS MATERIALS 1 to 2 tons lasts all day.
ENVIRONMENTALLY FRIENDLY Recycles existing asphalt/minimizes
ASPHALT STORING & RECLAIMING
Maximum storage time at ambient temperature UNLIMITED
Maximum storage time under heat 48 HOURS
Optimum storage temperature 280 DEGREES F (138 C)
Maximum storage temperature 325 DEGREES F (162 C)
WHAT'S IMPORTANT TO KNOW ABOUT HEATING ASPHALT
There are 4 very important variables to keep in mind when heating asphalt pavement.  They are:
1. TIME - HOW LONG DOES IT TAKE TO PROPERLY SOFTEN THE ASPHALT?
As a general rule it should take approximately 8 minutes to properly heat the asphalt.  Three variables effect the heating time: Mother Nature (wind & temperature), Material (liquid content, aggregate, size, color, & age), Moisture (has it rained recently?)
2. DEPTH - HOW DEEP HAS THE ASPHALT BEEN SOFTENED?
It is critical that the asphalt is softened to such a depth so that the repair will be an integral part of the existing pavement.  A minimum of 1 1/2 to 2 inches of softening must be achieved.
3. SURFACE TEMPERATURE - HOW HOT IS THE SURFACE OF THE ASPHALT ONCE THE PROPER SOFTENING DEPTH HAS BEEN ACHIEVED?
THIS IS VERY IMPORTANT! Once the temperature of the asphalt has exceeded 425 degrees, the rate of oxidation (evaporation of oils) is accelerated.  The application of an asphalt rejuvenator helps to offset this oxidation.  At approximately 500 degrees the asphalt actually starts to burn rendering it useless and guaranteeing the failure of the repair.  Simply raking off the burnt asphalt will not remedy the situation because a portion of the existing heated asphalt must be left untouched so that the restoration can be rolled into a heated existing surface.
 
 

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Asphalt Repair and Restoration - Infrared Process - Central Massachusetts
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