2411Minor Concrete Structures

2411.1DESCRIPTION

This Work consists of constructing concrete Structures of miscellaneous types and varied designs, with or without metal reinforcement, and including box Culverts, retaining walls, Culvert headwalls, open flumes, and other cast-in-place items.

2411.2MATERIALS

Provide mix designations as shown on the Plans.

2411.3CONSTRUCTION REQUIREMENTS

Construct minor concrete Structures in accordance with 2401.3, “Construction Requirements,” and the following: A General The Department considers the Structure locations shown in the Plans as approximate only. The Engineer will establish the exact locations in the field. Each Structure shall conform to the planned design, but the Engineer may change the dimensions to fit on-site conditions. Do not order Materials until the Engineer establishes the exact locations and dimensions. Construct box Culverts in accordance with the standard box Culvert Plans pertaining to construction joints, reinforcement bar splicing, and computation of quantities except as modified by the following:

would result in a plane of weakness through the Culvert Structure

but are less than 60 feet long, the Department will allow additional splices at no additional cost to the Department

formulas as shown on the box Culvert Plans. The Engineer will adjust the formula quantities to account for additional Materials due to design modifications made by the Engineer or to provide for a completed Structure in accordance with the Plans and Special Provisions Dispose of excavated Materials not needed for backfilling excavations in accordance with 2106.3E, “Excavating Operations,” at no additional cost to the Department. B Falsework and Forms Use form lining on vertical faces exposed to view in the completed W ork. If required by the Special Provisions, provide detailed falsework or forming Plans. C Concrete Curing and Protection Provide curing protection for concrete Structures in accordance with 2401.3G, “Concrete Curing and Protection.” D Geotextile Fabrics Provide and install geotextile as shown on the Plans.

2411.4METHOD OF MEASUREMENT

The Engineer will measure structural concrete using the dimensions as shown on the P lans. The Engineer will separately measure each grade or mix of concrete. The Engineer will not make allowances for quantities in excess of the minimum dimensions shown on the Plans and will not make deductions for volumes displaced by metal reinforcement, chamfer strips, or other Incidentals. The Engineer will measure metal reinforcement in accordance with 2472.4A, “Reinforcement Bars.” If the Contractor provides additional splices in the reinforcement bars, the Engineer will not include the additional bar for these splices in the pay quantity. If the Contract requires separate items for Structure excavation or granular backfill Material, the Engineer will measure quantities in accordance with 2451, “Structure Excavations and Backfills,” only for Structures with estimated quantities as shown on the Plans.

2411.5BASIS OF PAYMENT

The Contract Unit Price for each grade or mix of structural concrete includes the costs of constructing the Structures complete and in-place. The Department will pay separately for metal reinforcement, Structure excavation, and backfill Materials if the Contract contains specific Unit Prices for these items. The Contract Unit Price for concrete ____ of each type includes the costs of constructing the Structures complete and in-place. If the Contract contains a Unit Price for a surface area, the Department will pay separately for concrete in accordance with 2461.5, “Basis of Payment.” The Contract Unit Prices for other applicable Contract Items include the cost of providing and installing geotextile fabric.

The Department will pay separately for Structure excavation and special backfill Materials only when the Contract contains Unit Prices for volume and the Plans show an estimated quantity for specific Structures. The Department will not provide separate payment for Structure excavation and special backfill Materials if the Contract contains Unit Prices for Structures by individual unit. The Department will pay for Concrete Structures on the basis of the following schedule: Item No. Item Unit

2411.502 Concrete ____ each

4 Concrete ____ square yard

7 Structural Concrete (Mix No.) cubic yard

7 Structure Excavation Class ___ cubic yard

7 Granular Backfill (*) cubic yard

7 Aggregate Backfill (*) cubic yard

8 Reinforcement Bars (___) pound

* Specify the basis of measure (LV or CV) after the item name. See 2451.4B, “Granular Materials.”