162521 — Continuously Reinforced Portland Cement Concrete Pavement

521.01 Description

Construct continuously reinforced Portland cement concrete pavement on a prepared subgrade.

521.02 Materials

Refer to 520.02 and the following: Reinforcement. Section 908 for reinforcement, load transfer assemblies, tie bars, deformed steel bars, and longitudinal tie devices, except that all materials shall be epoxy coated. Select the type of reinforcement from one of the following:

521.03 Construction

Refer to 520.03 except as follows.

521.03.01 Placing Reinforcement. Preset the reinforcement on chairs or chair bars with the

transverse members placed below the longitudinal members. Place the longitudinal bars within the tolerances specified. Before placing the concrete, remove rust, mud, oil, or other detrimental coatings. Place the mat and fabric reinforcement flat and free from distortions. Furnish loose steel bars that are free from kinks or bends that prevent them from being properly assembled or installed. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS Furnish approved chairs or chair bars designed to support the reinforcement in position without deflection or displacement during the placing and consolidation of the concrete. Use chair bases designed with sufficient bearing to prevent overturning or penetration into the subgrade, and that will not impede placement of the concrete. Chairs may be welded to the transverse bars prior to epoxy coating. If the support system does not hold the reinforcement within the specified tolerances, increase the number of chairs or take other steps to maintain proper positioning of the steel.

521.03.02 Placing Concrete. Place the concrete in one lift, vibrated internally over its full width

and depth by immersion vibrators mounted at intervals of not more than 30 in. center to center across the full width of the slab. The vibrators shall have variably controlled frequencies. Operate the vibrators at the frequency and amplitude necessary to be perceptible on the surface of the concrete more than 1 ft in any direction. Mount the vibrators as a group advancing longitudinally with the paving machinery, hinge mounted to facilitate riding over obstructions, and set to clear the reinforcement by approximately 1/2 in. Stop all screeding and vibrating operations immediately whenever forward motion of the paving machinery is stopped.

521.03.03 Joints. Do not place transverse expansion or contraction joints in continuously

reinforced Portland cement concrete pavement. Construct a transverse bulkhead joint whenever concreting operations are stopped for more than 30 minutes and at the end of any working period. Form the joints using an approved header board in conformance with the cross section of the pavement, placed at right angles to the center line, and perpendicular to the surface. Furnish and install additional bars as specified. Finish the pavement flush with the header board without edging. Complete the joints accurately and keep the bulkhead clean. Extend the roadway reinforcement continuously through the joint. Support the reinforcement extending through the joint securely on chairs or wooden sills to prevent deflection. Resume paving operations when the Engineer determines that the concrete has sufficiently set. Before resuming concrete placement, remove the bulkhead and debris and clean the joint. Seal all joints as specified in Section 523. 521.03.04 Terminal Joints. Construct terminal joints as specified.

521.03.05 Thickness Check. Refer to 520.03.10.

521.03.06 Pavement Profile. Refer to the pavement surface profile requirements in the Contract

Documents. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS

521.04 Measurement and Payment

Continuously Reinforced Portland Cement Concrete Pavement will be measured and paid for at the Contract unit price per square yard. The square yard measurement will conform to 520.04. The payment will be full compensation for all concrete, forms, reinforcement steel, chairs, epoxy coating, finishing, curing, joints, joint construction, saw cutting and joint sealing, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.

521.04.01 Pavement Thickness Price Adjustment. Refer to 520.04.01. 521.04.02 Terminal Joints. Terminal Joints will be measured and paid for at the Contract unit

price per linear foot. The payment will be full compensation for all steel beams, stiffener plates, end plates, drilled holes, welding, cutting, styrofoam, joint filler, concrete, reinforcement, bond breaker, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. 522 — PORTLAND CEMENT CONCRETE PAVEMENT REPAIRS CATEGORY 500 PAVING SECTION 522 — PORTLAND CEMENT CONCRETE PAVEMENT REPAIRS

522.01 Description

Repair plain, conventionally reinforced, or continuously reinforced Portland Cement Concrete (PCC) pavement. Repairs are either Type I, 6 ft to less than 15 ft in length; or Type II, 15 ft and greater in length.

522.02 Materials

Refer to 520.02 except as follows. Graded Aggregate for Base Course 901.01 Crusher Run Aggregate CR-6 901.01 Concrete Mix No. 9 902.10 Nonshrink Grout 902.11(c) Epoxy Grout 902.11(d) Epoxy Adhesive 921.04 Concrete Mix HE 902.10 Macro Polyolefin Fibers 902.15.01

522.02.01 Polyester Grout. A polyester grout may be used in lieu of epoxy grout, provided the

grout conforms to 902.11(d). Identify cartridge type systems by batch or lot number.

522.02.02 Epoxy Adhesives. Refer to 921.04. Use water insensitive materials classified as

Type V, Grade 3, Class B and C. 522.02.03 Reinforcement. Refer to Section 908 for reinforcement, including load transfer assemblies, tie bars, deformed steel bars, and longitudinal tie devices, except all material shall be epoxy coated.

522.03 Construction

The Engineer will determine the areas to be repaired and the type of repair. Submit a proposed repair plan, including equipment, methods, and procedures prior to the start of repairs. If repairs cover multiple lanes, ensure that the longitudinal joints are established according to 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS