Cold In Place Recycling Specifications

Complete CIR best practice guidelines for construction are contained in CR101 and recommended quality control checks are contained in CR301. As General rules of thumb, follow the below points and recommendations:

• Check depth of milling at available longitudinal joints
• Verify maximum size of RAP
• Check the application rate of bituminous recycling agent by evaluating the mass of recycled material against the volume of recycling agent used for a single tanker.
• For foamed asphalt, check the temperature of the asphalt before connecting a tanker to the recycling unit or mixer.
• For foamed asphalt, verify the expansion ratio and half-life using the test nozzle on the recycling unit or mixer.
• Verify application rate of dry additives either volumetrically or by using a standard “canvas patch” test, or similar procedure.
• Verify application of additives applied by slurry using the consumption of additive (and water) obtained from the computer that controls the slurry mixing unit.
• Determine percent compaction by comparing the in-place density to the target density established in the control strip. If the uniformity of the mixture changes significantly, re-establish the target density.
• With emulsified asphalt recycling agent after a 3-day minimum cure, consider rerolling when the pavement temperature exceeds 80 F (27 C) to reduce air voids.
• Check surface tolerance with a 10-foot (3-m) straight edge utilizing a wedge ruler that can slide between the pavement/straight edge interface to accurately measure the gap.