438.1 General Description
This work includes furnishing and installing precast concrete header curb according to the plans.
438.1.01 Definitions
General Provisions 101 through 150.
438.1.02 Related References
A. Standard Specifications Section 441—Miscellaneous Concrete Section 500—Concrete Structures Section 853—Reinforcement and Tensioning Steel Section 866—Precast Concrete Catch Basin, Drop Inlet, and Manhole Units B. Referenced Documents General Provisions 101 through 150.
438.1.03 Submittals
General Provisions 101 through 150.
438.2 Materials
Use concrete materials that meet the requirements of Section 500, Class AA-1, air entrained, and the following Specifications: Reinforcing and Tensioning Steel 853.2.01 Dowel Bars and Tie Bars 853.2.08 Ensure that the manufacture and testing of concrete cylinders meet the requirements of Section 866, as applicable.
438.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
438.3 Construction Requirements
438.3.01 Personnel
General Provisions 101 through 150.
438.3.02 Equipment
General Provisions 101 through 150.
438.3.03 Preparation
General Provisions 101 through 150.
438.3.04 Fabrication
General Provisions 101 through 150.
438.3.05 Construction
A. Excavation Excavate the subgrade to the required grade and cross section shown on the Plans or as directed by the Engineer. Remove unsuitable material in the subgrade and backfill as necessary. B. Precast Concrete Header Curb Use precast concrete header curb as an alternate for granite curb when specified in the Plans. 1. Do not use it with existing or required granite curb, unless shown on the Plans or directed by the Engineer. 2. Make precast header curb in tangent sections only. 3. Pour curbed portions in place according to Section 441. Provide dowels or dowel holes in poured-in-place portions for tying in precast sections. 4. Ensure that precast sections conform to the dimensions and details on the Plans.
438.3.06 Quality Acceptance
General Provisions 101 through 150.
438.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
438.4 Measurement
Precast concrete header curb complete in place is measured per linear foot (meter). Excavation and backfill are not measured separately for payment.
438.4.01 Limits
General Provisions 101 through 150.
438.5 Payment
This Item measured for payment includes the required excavation, backfill, and incidentals to complete the Item. Payment will be made under: Item No. 438 Precast concrete header curb [height] in. (mm) Per linear foot (meter)
438.5.01 Adjustments
General Provisions 101 through 150.
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