528 RESURFACING ASPHALT PAVEMENT USING PORTLAND CEMENT CONCRETE

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528.01 DESCRIPTION
Resurface existing asphalt pavements with a Portland Cement Concrete (PCC) surface. The location and extent of the resurfacing will be as specified and as directed.
528.01.01 Whitetop Patching (WT Patching).
Removal of deteriorated remaining pavement, stone base, or soil after milling and replacing with concrete.
528.02 MATERIALS
Aggregates       901.01
Concrete Admixtures       902.06
Portland Cement Concrete Whitetopping Mix       902.10 Mix No. WT
Rapid Hardening Cementitious Materials for Concrete Pavement Repairs       902.14
Synthetic Fibers       902.15
Joints       Section 911
Portland Cement Concrete Plants       915.03
528.03 CONSTRUCTION
Submit the proposed paving plan at least 30 days prior to beginning the work. The plan shall include equipment, milling plan, proposed material sources, and placement methods.
Ensure pavement surfaces are protected from all damage. Mix, place, and finish the concrete when natural light is sufficient, or provide adequate artificial lighting as approved.
528.03.01 Pre-pave meeting. Conduct a pre-paving meeting at least three weeks prior to beginning the work. The meeting shall consist of the following personnel: Contractor, concrete supplier, paving sub-contractor (project manager and onsite foreman/supervisor), traffic control personnel, Project Engineer, lab personnel, and OMT Design Engineer. Provide the meeting minutes to all attendees.
Discuss the following issues during the meeting: work schedule, who is responsible for changes and the approval process for those changes, traffic control, traffic control limits, weather conditions/temperatures, type of equipment for the work, material supply, saw-cutting, curing, protection/transportation of cylinders if being used for opening strength determination, allowable admixtures, material removal, break down procedures, and opening to traffic.
Discussions should also cover the following: a plan if the pavement is left too thin after milling, a plan if stone base/soil is encountered during or after milling, mix approval, and how to maintain the designed pavement thickness while paving.
528.03.02 Surface Preparation. Mill the existing pavement before Whitetopping Mix placement as shown or as directed. After milling clear all debris or other loose material so that the existing pavement can be inspected by the Engineer to determine if WT Patching or RUMR is required. Prior to WT Patching, surface should be free of any dust, contaminants, or loose material that might prevent an adequate bond.
528.03.03 WT Patching. After milling, remove areas showing signs of deterioration as determined. The condition of the underlying stone base or soil and depth of the removed material will be determined by the Engineer after removal of the deteriorated material.
(a) If the stone base is in good condition and shows no sign of distress, patch the area with WT patching.
(b) If the stone base or soil shows sign of distress or is unstable, follow 528.03.04.
528.03.04 Removal of Unsuitable Material and Refill (RUMR). Refer to 528.03.03. Remove the material in these areas to a depth as determined by the Engineer. Compact the underlying stone base or soil then place WT Patching as directed.
528.03.05 Equipment. Refer to 520.03.01. Slip form equipment is not needed. Match curing may be used. If match curing is to be utilized, the following equipment will be required:
(a) Match Curing Apparatus, according to R 72.
(b) Mobile Match Curing Specimen Testing Apparatus, according to T 22.
Match curing apparatus and mobile match curing specimen testing apparatus remain the property of the Contractor at the completion of the project.
528.03.06 Weather Restrictions. Refer to 520.03.02 for weather restrictions except the requirement for the temperature as modified herein.
Place concrete when the ambient air and surface temperatures are at least 50 F and rising and discontinue when the temperature falls below 45 F.
528.03.07 Forms. Refer to 520.03.04.
528.03.08 Concrete Placement. Refer to 520.03.07, except as follows:
(a) Prior to placement of WT patching, check the depth of the milled areas with a string line or long straight edge to determine if the depth of the milled area is uniform over the milled pavement area as shown. Paving operations may proceed upon approval.
(b) Mechanical spreading and finishing equipment may be operated on the existing lane only after the placed concrete has reached a compressive strength of 2000 psi.
(c) An evaporation reducer may be applied to the placed surface during the final finishing process, as needed.
528.03.09 Consolidation of Concrete. Refer to 520.03.08, Fixed Form Paving.
528.03.10 Thickness Check. Refer to 520.03.10, except as follows:
(a) After the pavement is placed and before diamond grinding, cut cores to be measured for thickness for pay and final acceptance.
(b) Locate two cores in each lane unless otherwise specified or as directed.
(c) Fill core holes with Rapid Hardening Cementitious Materials at no additional cost.
528.03.11 Curing. Refer to 520.03.12. If match curing is used, refer to 528.03.05(a), or as directed. Cure the concrete for a minimum of 24 hours or until opening to traffic strength (2000 psi) is achieved. The requirement for an approved spraying machine having drive wheels is waived when using the liquid membrane forming compound method.
528.03.12 Joints. Joints shall conform to the details shown and as specified, and perpendicular to the finished grade of the pavement. Transverse construction and contraction joints shall be straight and continuous from edge to edge of the pavement.
(a) Transverse Construction Joints. Install transverse construction joints at the end of each day's concrete placement operations and at any other points within a paving lane where placement is interrupted for 30 minutes or longer. Locate transverse joints at a planned joint except in cases of equipment breakdown.
(b) Contraction Joints. Construct longitudinal and transverse contraction joints by sawing.
(1) Sawed Joints. Saw grooves in the concrete with a 1/8 in. blade to 1/3 the depth of the slab. The typical joint spacing shall be 6 ft x 6 ft, unless otherwise specified or as directed. Schedule the time of sawing based on current and anticipated weather conditions to prevent uncontrolled cracking of the pavement. Begin sawing as soon as the concrete has hardened sufficiently to permit cutting the concrete without chipping, spalling, or tearing. Re-spray any membrane cured surface damaged during sawing operations as soon as the surface becomes dry.
528.03.13 Pavement Surface Diamond Grinding. Refer to Section 509.
528.03.14 Pavement Profile. Refer to Section 535.
528.03.15 Opening to Traffic. The pavement may be opened to vehicular traffic after having attained a compressive strength of 2000 psi. Prepare the field samples according to PP 54. Test the cylinders on site under observation with a portable testing machine according to T 22. These tests are for determining concrete strength for opening to traffic, not for acceptance.
528.04 MEASUREMENT AND PAYMENT
Resurfacing Asphalt Pavements Using Portland Cement Concrete will be measured and paid for at the Contract unit price per square yard for the pertinent Portland Cement Concrete Pavement items. The square yard measurement will be computed on the basis of the as-built width and as-built length measured along the pavement center line. The payment will be full compensation for placement of all Portland Cement Concrete, forms, surface preparation, evaporation reducer, curing, joints, joint construction, saw cutting, corrective action due to the Contractor’s negligence, match-cure cylinder testing, measuring pavement thickness, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
528.04.01 Milling of the existing pavement and removal and disposal of all asphalt millings will be measured and paid for under separate pay items as specified in Section 508.04.
528.04.02 Portland cement concrete for WT patching will be measured and paid for at the Contract unit price per cubic yard.
528.04.03 Removal of deteriorated material, stone base or soil will be measured and paid as Class 1-A Excavation as specified in Section 201.
528.04.04 Diamond Grinding Portland Cement Concrete Pavement will be measured and paid for at the unit cost per square yard. The payment will be full compensation for grinding, cleaning the pavement surface, technicians, removal and disposal of all grindings, surface profile testing, corrective action, and for all material, labor, equipment, and incidentals necessary to complete the work.
528.04.05 Pavement Thickness Price Adjustment. Refer to 520.04.01.