| b. | When any thickness measurement is less than specified by more than 1 inch, the actual thickness of the Pavement will be determined by taking additional cores at intervals less than 10 feet parallel to the centerline in each direction from the affected location, until in each direction a core is found which is not deficient by more than 1 inch. Exploratory cores for deficient thickness will not be used in averages for price adjustments. |
| c. | At COR’s discretion payment may be made for areas deficient in thickness by more than 1 inch at 50 percent. If not, remove and replace. |
| d. | Price adjustments and Pavement removal will be applied only to those areas showing the deficient thickness which is defined by an additional set of cores taken at the 100 percent pay point as determined in a straight line basis between the original cores. If the second set of cores is deficient, the area will be defined on a straight-line basis using all scores for the different pay factors. |
| 3. | Roughness: “Must grind” bumps are removed and tolerance for profile roughness index is not exceeded. |
| PART 2 | PRODUCTS |
| 2.1 | CONCRETE |
| A. | Compression Design: |
| 1. | Cast-in-place: Class 4000, Section 03 30 04. |
| 2. | Slump per accepted mix design. |
| B. | Flexure Design. |
| 1. | Tensile Strength: 650 psi per ASTM C 78. |
| 2. | Cement Content: 6.5 bags. |
| 3. | Water Cement Ratio: 0.44 maximum by weight (prior to pozzolan exchange), ACI 318. |
| 4. | Entrained Air: 5 to 7 percent, ASTM C 231 (pressure). |
| 5. | Slump per accepted mix design |
| 2.2 | MISCELLANEOUS MATERIALS |
| A. | Reinforcement: Grade 60 ksi galvanized or epoxy coated steel, Section 03 20 00. |
| B. | Hook Bolts: Steel, ASTM A 307 Grade A nuts and bolts, internally and externally threaded. |
| C. | Expansion Joint Filler: F1 sheet, Section 32 13 73. |
| D. | Contraction Joint Filler (Backer Rod): Type 1 round, closed cell, ASTM D 5249. |
| E. | Contraction Joint Sealant: HAS1, HAS4, or CAS6, Section 32 13 73. |
| F. | Curing Compound: Liquid membrane, Section 03 39 00. |
| G. | Bond Breaker: Wax based compound. |
| H. | Grout: Epoxy adhesive, Section 03 61 00. |
| I. | Evaporative Reducer: Water-based mono-molecular polymer liquid at application rates recommended by the manufacturer. Not to be used as a finishing aid. |
| PART 3 | EXECUTION |
| 3.1 | PREPARATION |
| A. | General: |
| 1. | Coordinate utility location, Section 01 31 13. |
| 2. | Lower Street Fixtures if paving machine is not capable of passing over fixtures. |
| 3. | Coat surface of Street Fixtures with oil to prevent bond with concrete Pavement. |
| 4. | Remove sand, leaves and other objectionable materials prior to placing the paving course. |
| 5. | Notify COR minimum 24 hours prior to commencement of concreting operations. |
| B. | Trees, Plants, Ground Cover: |
| 1. | Protect trees, plants and other ground cover from damage. |
| 2. | Repair tree damage at no additional cost to the Government. |
| C. | Traffic Control: |
| 1. | Provide worker and public safety, Section 01 55 26. |
| 2. | Apply temporary traffic and lane marking tape or paint after placement layout has been verified by COR. |
| D. | Base Course: |
| 1. | Verify base course is placed to grade, compacted and dampened. |
| 2. | If indicated, apply prime coat, Section 32 12 13. |
| E. | Cement Treated or Lean Concrete Base: Remove loose material from surface of cement treated or lean concrete base course immediately before placing concrete surface course. Moisten the surface but do not place concrete over puddled water. Apply a double coat of bond breaker prior to placing surface concrete. |
| 3.2 | FORM CONSTRUCTION |
| A. | Section 03 11 00. |
| B. | Check formwork for grade and alignment variance from the following tolerances: |
| 1. | Top of forms not more than 1/4 inch from true grade. |
| 2. | Vertical face on longitudinal axis not more than 1/4 inch from true line. |
| C. | Place joint filler vertical in position, in straight lines. Secure to formwork during concrete placement. |
| 3.3 | REINFORCEMENT PLACEMENT |
| A. | Section 03 20 00. |
| B. | Interrupt reinforcement at expansion joints. |
| C. | Use load transfer bars on longitudinal construction and transverse construction joints. |
| D. | Use smooth dowel in expansion joints. |
| E. | Keep load transfer bars and dowels in vertical center of concrete and perpendicular to the joint during concrete placement. |
| F. | Position mats on bar chair supports and properly tie before any concrete is poured. Keep mats clean, free from rust, flat, and free of distortions. Straighten bends, kinks, and other irregularities or replace units before concrete placement. Provide a minimum of 2 inch overlap to adjacent mats. |
| 3.4 | JOINTS |
| A. | General: |
| 1. | Review joint layout with COR. |
| 2. | Follow Section 32 13 73 requirements. |
| 3. | Follow joint requirements in APWA Plan No. 261. |
| B. | Construction Joint: Construction joints (contact joints) (cold joints) are those made by placing concrete against cured concrete. |
| 1. | The contact joint between separately laid lanes cannot deviate from a true line by more than 1/4 inch in any direction at any point. |
| 2. | Tie both sides of longitudinal and transverse construction joints together with tie bars or key-way. Before placing concrete in adjoining slab, straighten tie bars to 0.1 feet of straight position. |
| 3. | Do not cause edge slump when placing tie-bars or by over-working edge of slab. |
| C. | Contraction Joints: Contraction joints (crack control joints) are scorelines made to force crack joint locations in concrete. Keep a minimum of 3 working power saws on the Project when concrete operations are underway. Saw all joints before uncontrolled shrinkage cracking takes place. Do not tear or ravel concrete during sawing. |
| 1. | Joint spacing measured in feet = twice the slab thickness measured in inches or a maximum of 15 feet. |
| 2. | Joint Depth = T/3. |
| 3. | Use of a mechanical control joint-void former in lieu of saw cutting or tooling is acceptable. |
| 4. | Longitudinal Joints: Make longitudinal joints the same dimension as transverse joints. |
| 5. | Make transverse joints across width of the Pavement full length and meet curb and gutter joints. |
| 6. | Leave forms in place until paving operations are resumed on the other side of the joint. |
| D. | Volunteer Crack Joint: |
| 1. | If a volunteer crack joint falls within 5 feet of the location of proposed contraction joint, omit the contraction joint. |
| 2. | Rout volunteer crack joints to a 1-1/4 inch depth by 3/8 inch width. Clean and fill crack joint with backer rod and joint sealant. |
| 3. | When crack joints occur within 2 feet of expansion or construction joints, replace panel. Use saw cuts and tie-bars or dowels in cut planes. |
| E. | Expansion Joints: |
| 1. | If a deformed rebar is used in an expansion joint, provide sleeve for movement. |
| 2. | Secure fillers to prevent movement. When butted together, do not leave voids or gaps between filler units. |
| 3. | Set joint fillers full depth if no joint sealant is specified. |
| 4. | Recess joint fillers if backer rods and joint sealant are specified or provide a plastic cap. |
| F. | Joint Sealing: Section 32 13 73. |
| G. | If Contractor chooses to open the roadway to construction or public traffic prior to final sawing and sealing, install backer rod in the initial (green) cut to prevent entrance of incompressibles. |
| 3.5 | CONCRETE PLACEMENT |
| A. | Section 03 30 10. |
| B. | At the beginning of concrete placement, test slump and air. If corrections are necessary, placement may proceed after 2 subsequent and consecutive batches pass testing. |
| C. | Any delay in excess of 15 minutes from placing to start of finishing operations is cause for stopping placement work. |
| D. | Do not place concrete until concrete sub base and surface course forms have been checked for line and grade. Moisten sub base if required to provide a uniform dampened condition at time of concrete placement. Do not place concrete around Manholes or other structures until they are at required finish elevation and cross-slope. |
| E. | Prevent segregation of mix. Consolidate concrete along face of forms and adjacent to transverse joints with internal vibrator. Keep vibrator away from joint assemblies, reinforcement, or side forms. Use only square-faced shovels for hand-spreading and consolidation. Consolidate with care to prevent dislocation of reinforcing, dowels, and joint devices. |
| F. | Do not place concrete in a longitudinal section until test specimens from the adjacent lane have attained an ASTM C 78 flexural strength (modulus of rupture) of 450 psi. |
| G. | Deposit and spread concrete in a continuous operation between transverse joints. If interrupted for more than 1/2 hour, place a construction joint. |
| H. | Place the concrete to the full width of the Pavement in a single construction operation unless indicated otherwise. |
| 3.6 | FINISHING |
| A. | Section 03 35 00. |
| B. | Any delay in excess of 30 minutes for completing the finishing operation is cause for stopping concrete placing to correct the difficulties. |
| C. | After striking-off and consolidating concrete, smooth surface by screeding and floating. Use hand methods only where mechanical floating is not possible. Adjust floating to compact surface and produce uniform texture. |
| D. | After floating, test slab for trueness with a straight edge. Distribute concrete as required to remove surface irregularities. Refloat repaired areas to provide a continuous smooth finish. |
| E. | Round edges of slabs, gutters, back top edge of curb, and formed joints with an edging tool. Eliminate tool marks. |
| F. | Surface Texture: After floating when excess moisture or surface sheen has disappeared. |
| 1. | For speed less than 45 mph: 1/16 inch deep burlap drag, turf drag, or broom. |
| 2. | For speed greater than 45 mph: 1/8 inch deep groove placed 80 degrees to center line and randomly spaced between 3/8 and 1-1/2 inches. |
| G. | Do not remove forms for at least 24 hours after concrete has been placed. After form removal, clean ends of joints and patch any minor honeycombed areas. Remove and replace areas or sections with major defects. |
| 3.7 | CURING |
| A. | Section 03 39 00. |
| B. | Type II Class A or B (white pigmented) membrane forming compound applied in two directions for total white coverage on all exposed surfaces after texturing. |
| C. | Eliminate thermal shock of concrete by keeping cure temperature close to ground and air temperature. |
| 3.8 | TOLERANCES |
| A. | Grade: 1/8 inch in 10 feet parallel to centerline. |
| B. | Cross Slope: 1/4 inch in 10 feet perpendicular to centerline except at cross section grade breaks. |
| C. | Thickness: Not less than 1/4 inch deficient. |
| D. | Roughness: |
