389 The pulverized material shall be processed through a mixing unit capable of combining the pulverized material, asphalt emulsion, and any additives to produce a homogenous recycled mixture. The asphalt emulsion shall be injected into the pulverized asphalt material at the initial rate determined by the mix design and 240 approved by the Engineer. Sampling and mix design may determine different levels of asphalt emulsion at various portions of the project. When a paving fabric is encountered during the pulverization operation, the Contractor shall make necessary changes in equipment or operations so incorporation of shredded fabric into the CIR does not affect the performance parameters or inhibit placement or compaction of the CIR. The Contractor shall be required to remove and properly dispose of oversized pieces of paving fabric. The Contractor shall make the necessary adjustments in equipment or opera tions so that the shredded fabric in the recycled material is no more than 5 sq in. No fabric piece shall have a dimension 250 exceeding a length of 4 in. Rubberized crack filler, durable pavement markings, loop wi res, and other non- pavement materials shall be removed, as observed, from the roadway during the CIR process. Residual materials that cannot be completely removed may be incorporated into the mixture if the Contractor can demonstrate that those added materials will not adversely affect performance. Any such materials retained in the mixture shall be appropriately sized and blended so as to not adversely affect the strength of the CIR. 260 Asphalt emulsion shall have an application tolerance determined by adding ±0.25% to the percent total asphalt emulsion content recommended by the mix design. The Contractor can request the asphalt emulsion percentage to exceed the upper tolerance provided the mix design requir ements are satisfied at the requested percentage. The request will be subject to approval by the Engineer.
416.10 Control Strip and Compaction A minimum 500 ft long control strip shall be conducted on the first day of 270
production to verify the construction process meets the requirements as specified. The control strip shall allow the Contractor to:
a.demonstrate the proposed equipment, materials, and processes can produce a CIR layer in accordance with specification requirements,
b.determine the optimal rates for the asphalt emulsion, water, and any additives recommended for the reclaimed material, and
c.determine the sequence and manner of rolling necessary to obtain specified density requirements. 416.10 The CIR density shall be achieved with the same equipment, materials, construction methods, and dens ity requirements used on the accepted control strip. A new control strip shall be constructed if changes are made outside of the tolerances of the original mix design, equipment, or construction methods. A rolling pattern that produces the maximum obtainable density, or optimum field density, shall be determined during the control strip using a roller in accordance with 290 409.03(d)4. The Contractor shall provide a sequence and manner of rolling by establishing a roller pass versus density chart showing the progress of densification from initial lay down through optimum field density using a properly calibrated nuclear gauge in accordance with AASHTO T 310. Production may continue after approval of the control strip. The Contractor shall perform compaction testing in accordance with AASHTO T 310 during production to ensure compaction is between 97% and 102% of the optimum field density established during the control strip. If two successive tests indicate compaction is over 102% or below 97% of the optimum field density, a new 300 rolling pattern and roller pass versus density chart shall be established. The QC technician shall be on site, observing all compaction efforts, and approving areas as they reach minimum relative compaction. Care shall be taken not to over compact the mat. Any type of rolling effort that causes cr acking, displacement, or other type of pavement distress shall be discontinued until such time as the problem can be resolved as approved by the Engineer. 310 Rollers shall not be started or stopped on recycled material except when changing direction during the compaction process. All tests shall be conducted at the stated QC testing frequencies throughout CIR operations. 416.11 Opening to Traffic Opening to traffic shall occur after sufficient cure time has been applied to the CIR so traffic will not initiate raveling or permanent deformation. All loose particles that may develop on the pavement surface sh all be removed by a rotary power broom 320 in accordance with 409. After opening to traffic, the surface of th e recycled pavement shall be maintained in a condition suitable for the safe movement of traffic.
416.12 Maintenance
The Contractor shall mainta in the recycled pavement in a manner satisfactory to the Engineer until the surface course has been constructed. 416.11 Any damage to the completed recycled material shall be repaired by the 330 Contractor prior to the placement of new asphalt concrete or final surface sealing. Patching shall be in accordance with 304. The excavated patch areas shall be filled and compacted with HMA or CIR material as dir ected by the Engineer. No direct payment will be made for damage or repair unless approved by the Engineer. 416.13 Curing Before placing the final surfacing, the recycled surface shall remain in-place for a minimum of three days and meet one of the following conditions: (a) there is less than 3.0% moisture remaining in the mixture, or 340
b.the material has cured for a minimum of 10 consecutive days without rainfall. The planned method and duration of curing for CIR shall be in accordance with the QCP. The specified surface course sha ll be placed within two weeks of the CIR final cure, but no later than November 1.
416.14 Milling
The entire surface of the CIR shall be scarified in accordance with 306.04 in 350 preparation for the overlay, except liquidated damages will not apply. Construction engineering shall be provided in accordance with 105.08(b).
416.15 CIR Surface Course
The surface course atop the CIR shall be as shown on the plans. The CIR shall be swept of all loose material and standing water with a rotary power broom in accordance with 409 immedi ately prior to placing the surface. The CIR shall be swept lightly to avoid damage to the CIR. A tack coat shall be required only for the HMA overlay and shall be applied to the CIR in accordance with 406 immediately following sweeping operations. Monuments shall be reestablished in accordance with 615.10.
416.16 Method of Measurement
The CIR will be measured by the square yard, complete in place. Asphalt emulsion will be measured by the ton. Aggregate used to adjust the CIR gradation will be measured by the ton. HMA patching wi ll be measured in accordance with 304.06. Milling will be measured in accordance with 306.10. Re-established monuments will 370 be measured in accordance with 615.13. Gr ade adjustment of existing structures will be measured in accordance with 720.06. Removal of snowplowable raised pavement markers will be measured in accordan ce with 808.12. Portland cement will be measured by the ton. 416.16
416.17 Basis of Payment
The CIR will be paid for at the contract unit price per square yard, complete in place. Asphalt emulsion will be paid for at the contract unit price per ton, complete in place. Aggregate used to adjust the CIR grada tion will be paid for at the contract unit price per ton, complete in place. HMA patching will be paid for in accordance with 380
304.07 for the thickness shown on the plans. Milling will be paid for in accordance
with 306.11. Re-established monuments will be paid for in accordance with 615.14. Grade adjustment of existing structures will be paid for in accordance with 720.07. Removal of snowplowable raised pavement markers will be paid for in accordance with 808.13. Portland cement will be paid for in accordance with 104.03. The change order will include direct material costs, delivery costs, and shall not include any other markups. Payment will be made under: 390 Pay Item Pay Unit Symbol Cold In-Place Recycling ............................................................ SYS Corrective Aggregate, CIR ........................................................ TON Stabilizing Material, Asphalt Emulsion ..................................... TON Stabilizing Material, Portland Cement ...................................... TON The costs of the CIR mix design and QC testing shall be included in the cost of the CIR. 400 The costs associated with removal of gr ass and vegetation, rubberized crack filler, durable pavement markings, loop wires and other non-pavement materials shall be included in the cost of the CIR. The costs associated with stabilizing, compacting, curing and maintenance of the CIR not related to failing subgrade shall be included in the cost of the CIR. The cost associated with mixing water sh all be included in the cost of the CIR. The cost associated with aggregate wh en used to supplement material volume shall be included in the cost of the corrective aggregate pay item. When portland cement is a required stabilizing material, costs associated with mixing, installation, compaction, curing, and maintenance shall be included in the cost of the CIR. The cost associated with aggregate when used to adjust the CIR gradation shall be included in the cost of the corrective aggregate pay item. 420 416.17 393 The cost of milling the asphalt emulsion stabilized CIR to maintain profile shall be included in the cost of the milling. In the locations of failing subgrade, removal of the CIR shall be included in the cost of subgrade treatment.
Source: Indiana Standard Specifications, 2024 Edition. Pages 389–393 of 1,248.