Section 2310. Portland Cement Concrete Overlay
Overlay an existing pavement
with a PCC overlay: Existing pavements may include any of the following:
B. Composite pavement (flexible pavement over PCC).
C. Pavement with a stress relief layer placed over the top.
D. Full depth flexible pavement.
Meet the requirements of Article 2301.02.
1. Use Class C concrete for PCC Overlays as specified in Materials I.M. 529, except use a C-3WR or C-4WR mix design for Bonded Overlays. Allowable substitutions shall comply with Article 2301.02, B.
2. For coarse aggregate, meet the requirements of Section 4109.02, Aggregate Gradation Table, Gradation No. 3 or 5. Ensure the nominal maximum coarse aggregate size is no greater than one-third the overlay thickness.
3. Unless otherwise specified, use coarse aggregate for overlays over existing PCC pavement that is the same type of aggregate as the existing pavement. If existing pavement aggregate type cannot be determined or is not available, use limestone or dolomite coarse aggregate.
B. Hot Mix Asphalt Stress Relief Course.
1. When required by the contract documents, use an HMA stress relief course consisting of a nominal 1 inch course of HMA meeting the requirements of Section 2303.
2. Use PG 58-28S asphalt binder.
3. Use a mixture meeting the following:
a. Standard Traffic (ST), 3/8 inch HMA mix requirements.
b. Target air voids of 3.0%.
c. No maximum film thickness restriction and no minimum filler/bitumen ratio restriction.
d. Type B Aggregate (or better) with no percent crushed particle requirements and gradation falling below the restricted zone.
e. Apply Article 2303.05, A, 3, a, 2 for AAD Acceptance of lab voids.
Use white pigmented liquid curing compound meeting the requirements of Article 4105.05.
Apply the requirements of Section 2301 to this work with the modifications identified below.
A. Scarifying, Shotblasting, or Waterblasting Equipment.
Use power operated equipment capable of uniformly scarifying or removing the existing surface in a satisfactory manner and to depths required. Other types of removal devices may be used if their operation is suitable and if they can be demonstrated to the satisfaction of the Engineer. The contract documents will include a pay item for such work.
1. General.
a. If full depth base repair is included in the project, complete it prior to preparation of the existing pavement surface.
b. When required, include the entire area to be resurfaced in preparation of the existing pavement surface. Materials removed in the preparation operation may be placed in the shoulder area unless specified otherwise in the contract documents.
2. Surface Preparation.
a. When required for overlays over existing PCC pavement, prepare the surface by shot blasting, waterblasting, or scarifying. Scarify to a nominal depth of 1/4 inch.
b. Ensure preparation removes all dirt, oil, foreign materials, laitance, or loose material from the surface and edges against which new concrete will be placed.
3. Pavement Scarification.
a. When required, prepare surface by scarifying per Section 2214.
b. At the direction of the Engineer, trim high spots found in the existing flexible pavement. This work will be accomplished during the scarification operation, only at isolated locations, and will be considered incidental to the pavement scarification.
c. Bond Breaker.
Prior to placement of the PCC overlay, place two applications of liquid curing compound on all scarified PCC patches or other PCC surfaces to be overlain. Apply each coat evenly on the full area at a rate of 1 gallon per 200 square feet. If drying to the touch occurs within 10 minutes or rapid absorption into the scarified PCC surface is noted, then apply a third coat at a rate of 1 gallon per 200 square feet.
4. Hot Mix Asphalt Stress Relief Course.
Construct in accordance with Article 2303.03. Use Class II Compaction, except use only static steel wheeled rollers. Article 2303.04 shall also apply.
C. Placing and Finishing Overlay.
1. General.
a. Apply Section 2317 to all PCC Pavement bid items of a Primary project if any individual PCC Pavement bid item for that project is 5000 square yards or greater. Apply Section 2316 to all other Primary projects and when specifically required for other projects.
b. Clean existing surface of loose or adhering foreign material prior to and during placement of PCC.
c. Ensure existing pavement surface is free of standing water during PCC placement.
d. Ensure temperature of existing pavement surface does not exceed 120ºF during PCC placement. Water may be applied to cool existing pavement surface provided standing water is not present during PCC placement.
2. Joints.
a. Saw joints as shown in the contract documents. Seal all joints unless directed otherwise.
b. For overlays over existing PCC pavements:
1) Place joints directly over joints and cracks in the existing pavement.
2) Saw joints to the full depth of the overlay.
3) Ensure joints are at least as wide as the joint or crack in the existing pavement.
D. Limitation of Operations.
1. At forecasted air temperatures below 55°F use the maturity method to determine the opening time. Do not place resurfacing concrete when the air or pavement temperature is below 40°F.
2. The Contractor may use the shoulders for construction activities. It will be the Contractor's responsibility to repair the shoulders, as the Engineer deems necessary, to restore the shoulders to a condition acceptable for shoulder work. This work shall be done at no additional cost to the Contracting Authority. The Contractor may elect to limit the use and vehicle loadings to minimize this work and its cost.
3. Place concrete overlays over existing PCC pavements between June 1 and September 30.
E. Time for Opening Pavement for Use.
1. The time for opening pavement for use shall be in accordance with Article 2301.03, U.
2. When the maturity method for opening is utilized, the Engineer may allow an opening strength requirement of 350 psi, for overlays 6 inches or greater.
2310.04 method of measurement.
A. Portland Cement Concrete Overlay, Furnish Only.
Cubic yards using a count of batches incorporated. Includes concrete placed in widening sections and partial depth patches.
B. Portland Cement Concrete Overlay, Placement Only.
Square yards shown in the contract documents. Area will be determined from the longitudinal surface and the nominal pavement width, including widening sections.
Square yards shown in the contract documents. Area will be determined from the longitudinal surface and the nominal width of existing pavement.
1. Measurement by Weight.
The quantity of Pavement Scarification will be determined in accordance with Article 2214.04, A, 1.
2. Measurement by Area.
The quantity of Pavement Scarification will be determined in accordance with Article 2214.04, A, 2.
E. Hot Mix Asphalt Stress Relief Course.
1. Measurement by Weight.
a. HMA will be measured according to Article 2303.04, A.
b. Asphalt binder will be measured according to Article 2303.04, B.
2. Measurement by Area.
a. HMA will be measured according to Article 2303,04, A, 2.
b. Asphalt binder used will not be measured separately for payment.
1. Aggregate.
Cover aggregate will be measured according to Article 2307.04, A.
2. Binder Bitumen.
Binder Bitumen will be measured according to Article 2307.04, B.
A. Portland Cement Concrete Overlay, Furnish Only.
1. Per cubic yard.
2. Payment is full compensation for furnishing raw materials, proportioning, mixing, and delivery of concrete to the paving machine.
B. Portland Cement Concrete Overlay, Placement Only.
1. Per square yard.
2. Payment is full compensation for:
a. Furnishing all materials, labor, and equipment necessary to place, finish, texture, and cure the concrete.
b. Placement of tie bars for widening, if required.
c. Sawing, cleaning, and sealing the joints, if required.
d. Surface cleaning.
1. Per square yard.
2. Payment is full compensation for preparation of the existing pavement, scarifying or shot blasting, and for removal of the existing pavement surface material according to Article 1104.08.
1. Measurement by Weight.
The Contractor will be paid the contract unit price for Pavement Scarification in accordance with Article 2214.05, A, 1.
2. Measurement by Area.
The Contractor will be paid the contract unit price for Pavement Scarification in accordance with Article 2214.05, A, 2.
E. Hot Mix Asphalt Stress Relief Course.
1. Measurement by Weight.
a. Article 2303.05 applies.
b. Payment is full compensation for furnishing and placing the HMA stress relief course.
c. Asphalt binder will be paid for separately according to Article 2303.05, B.
2. Measurement by Area.
a. Article 2303.05 applies.
b. Payment is full compensation for furnishing and placing the HMA stress relief course, including the cost of the asphalt binder.
1. Aggregate.
Payment for cover aggregate will be in accordance with Article 2307.05, A.
2. Binder Bitumen.
Payment for binder bitumen will be in accordance with Article 2307.05, B.