8-33 Section 854
854-1 Description
Construct Portland cement concrete barrier in accordance with the contract. The concrete barrier may be cast in place, slip formed or precast, unless otherwise specified in the contract.
854-2 Materials
Refer to Division 10. Item Section Connector Pins and Eye Assemblies 1072 Curing Material s 1026 Grout , Type 3 1003 Guardrail and Barrier Delineators 1088 -2 Joint Filler 1028 -1 Low Modulus Silicone Sealant 1028 -3 Portland Cement Concrete, Class AA 1000 Steel Bar Reinforc ement 1070 -2 Galvanize connector assemblies in accordance with Section 1076. Use clear curing compound.
854-3 Construction Methods
A.Cast in Place or Slip Formed Construct concrete in accordance with Section 825 and give an ordinary surface finish, except as otherwise provided herein. Construct joints in accordance with the details shown in the plan s. Fill with joint filler and seal with joint sealer .
B.Precast Construct concrete in accordance with Section 825 and give an ordinary surface finish, except as otherwise provided herein. Do not handle or remove the forms from barrier until the strength of the concrete reaches at least 2000 psi as evidenced by nondestructive tests made in place by a rebound hammer in accordance with ASTM C805. Construct the base beneath the precast units to be equivalent to the adjacent pavement structure. Lift and place precast units using a two -point pick up, or other approved method that will not overstress or damage the concrete. Do not use connectors for lifting purposes. Do not use lifting devices or m ethods that will mar the surface of the concrete. Do not use any precast unit that has been cracked, damaged, chipped, scarred or otherwise disfigured.
C.Barrier Delineators Use any of the several alternate delineator types for barrier shown in the plans, but only one delineator type for barrier at any one time throughout the project. The delineators consist of a reflector and base or casing. Attach the delineator to the barrier as shown in the plans. Only one attachment position will be permitted througho ut the project length. Position delineators perpendicular to the centerline of the road. Use yellow delineators in the median and on the left side of one -way ramps, loops or other one -way facilities. Use
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 373–373 of 857.