Hot in-Place Recycling (HIR) to Repair Your Roads
Equipping you to apply soil stabilization and modification treatments with confidence & success.
Pre-Construction Testing
| Evaluation of Existing Pavement Structure | If pavement distresses suggest weak subgrade or if traffic levels are forecast to increase, check the strength of pavement and subgrade layers with falling weight deflectometer (FWD) or Dynamic Cone Penetrometer (DCP) | Recommended |
| Ground Penetrating Radar (GPR) | Verify thickness of existing asphalt and granular layers | Optional |
| Pavement Sampling | Obtain pavement cores for mix design and verify thickness of asphalt layers and presence and depth of geosynthetics | Required |
| Mix Design | Perform mix design in accordance with agency requirements | Required |
| Measure existing slope/cross fall | Ensure HIR can be constructed per contract requirements |
Cores should be checked for the presence of paving fabrics and should be at least 1 inch below the anticipated HIR depth.
Construction Testing
|
|
|
Surface Recycling |
Remixing |
Repaving |
|
Rejuvenating Agent |
Supplier generated COA or laboratory testing to comply with mix design parameters |
Recommended |
Recommended |
Recommended |
|
Rejuvenating Agent Temperature |
Probe or infrared temperature gun |
Recommended |
Recommended |
Recommended |
|
Rejuvenating Agent Injection Rate
|
Verify amount of rejuvenating agent per mix design and accuracy of meter readings by volumetric distribution |
Required |
Required |
Required |
|
Corrective HMA/ Aggregate Gradation |
Supplier generated COA or laboratory analysis (AASHTO T 11 and T 27 or ASTM C117 and C136) |
N/A |
Required |
N/A |
|
Corrective Aggregate Physical Properties |
Supplier generated COA or laboratory analysis (AASHTO T 96, T 176 and T 85 or ASTM C131, D2419 and C127) |
N/A |
Recommended |
N/A |
|
Corrective HMA Mixture Properties |
Supplier generated COA or laboratory analysis (Agency HMA Requirements) |
N/A |
Required |
N/A |
|
Corrective Aggregate/ HMA Addition Rate |
Volumetric distribution |
N/A |
Required |
N/A |
|
New HMA Mix Properties |
Agency HMA Requirements |
N/A |
N/A |
Required |
|
Ambient Temperature |
Any Owner Agency approved method |
Required |
Required |
Required |
|
Depth of HIR Treatment |
Depth probe measurement |
Required |
Required |
Required |
|
Recycled Mixture Temperature |
Probe or infrared temperature gun (behind screed) |
Require |
Required |
Required |
|
Control Strip |
Nuclear gauge per AASHTO T 355 (ASTM D2950) or Owner Agency approved method |
Recommended |
Recommended |
Recommended |
|
Recycled Material Compacted Density |
Nuclear gauge AASHTO T 355 (ASTM D2950) or Owner Agency approved method |
Required |
Required |
Required
|
Post-Construction Testing
| Cross-slope | 6 ft. (1.8 m) Smart level | Required |
| Mat Width | Tape measurement | Required |
| Surface Tolerance | 10 ft. (3 m) Straight edge | Recommended |
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