Unclassified Borrow Excavation 211 Structure Excavation 212 Rock Excavation 212 Wet Excavation 212 Select Material for Backfilling 613.5.11 Concrete 601 Reinforcing Steel 602
620.7 -METHOD OF MEASUREMENT : Excluding headwalls and wingwalls, three -sided bridge/culverts shall be measured by the linear foot, the measurement being along the centerline of the bridge/culvert and extending from the exposed face to exposed face of the headwalls. Wingwalls shall be measured by the unit. A wingwall is the entire end section for the three - sided structure including but not limited to headwalls, aprons, foundations for the wingwall, cut - off walls and appurtenances. There shall be no measurement and payment for headwalls. Headwalls shall be incidental to and include d in the unit bid price of the wingwalls. There shall be no separate measurement and payment for the excavation required for installing the bridge/culvert, including any undercut to establish an adequate foundation. Excavation, whether unclassified, stru cture, rock or wet excavation shall be incidental to and included in the unit bid price for the bridge/culvert and wingwalls. There shall be no separate measurement and payment for backfill below an elevation two feet above the top or crown of the outside of the bridge/culvert whether such backfill is unclassified borrow, select rock fill, select backfill or salvaged existing streambed material. All such backfill shall be incidental to and included in the unit bid price for the bridge/culvert and wingwalls. There shall be no separate measurement and payment for waterproofing membrane if the waterproofing membrane is specified on the plans and the limits of application are shown. Concrete and backfill shall be placed under dry conditions. Should cofferd ams, pumping or other methods be necessary to maintain dry conditions, the cost of these methods shall be incidental to and included in the unit bid price for the bridge/culvert and wingwalls. If the maintenance of traffic scheme necessitates the use of s heet piling or bulkheads during the installation of the bridge/culvert, the cost of piling and bulkheads shall be incidental to and included in the unit bid price for the bridge/culvert and wingwalls. If the design necessitates undercutting the foundation and backfilling to the footing elevation with select rock fill, the select rock fill shall be separated from soils with fabric for separation per subsection 715.11.8. The cost of the fabric shall be incidental to the unit bid price for the bridge/culvert and wingwalls. The cost of the construction layout work shall be incidental to and included in the unit bid price for the bridge/culvert and wingwalls. Additional work arising from changed conditions found during the construction from those shown on th e approved drawings shall be paid in accordance with subsection 109.4.
620.8 -BASIS OF PAYMENT : The quantities, determined as provided above, will be paid for at the contract price per unit of measurement, respectively, for each pay item listed below and shown in the bid schedule, which prices and payment will be full compensation for the work prescribed in this section.
478 620.9 -PAY ITEMS : ITEM DESCRIPTION UNIT 620001 -* Precast Reinforced Concrete Arch -Topped Bridge/Culvert, “vendor name” Linear Foot 620002 -* Precast Reinforced Concrete Flat -Topped Bridge/Culvert, “vendor name” Linear Foot 620003 -* Cast-In-Place Reinforced Concrete Culvert Linear Foot 620004 -* Wingwall for Concrete Culvert Each 620005 -* Two-Piece Precast Reinforced Concrete Arch Bridge/Culvert Linear Foot
* Sequence number
479 SECTION 623 PNEUMATICALLY APPLIED MORTAR OR CONCRETE (SHOTCRETE)
623.1 -DESCRIPTION : This work shall consist of repair of concrete structures, protection of structural steel, or any other type of work as may be designated on the Plans by applying one or more layers of concrete conveyed through a hose pneumatically projected at a high velocity against a prepared surface in conformity with the dimensions and design shown on the Plans. It shall include removal of all loose, soft, honeycombed, and disintegrated concre te, the preparation of the surface, the furnishing and placing of reinforcing steel including wire fabric, dowels, and any other steel items noted on the Plans, and the mixing and applying of shotcrete as outlined in this sub -section.
623.1.1 -Definiti ons: Dry-mix shotcrete -Shotcrete in which the mixing water is added to concrete materials at the nozzle. Nozzleman -Craftsman on shotcrete crew who manipulates the nozzle, controls consistency with the dry process, and controls final deposition of the m aterial. Shotcrete -This is mortar or concrete conveyed through a hose and pneumatically projected at high velocity onto a surface. Wet-mix shotcrete -Shotcrete in which all the ingredients, including water, are mixed before introduction into the deliver y hose; compressed air accelerates to the material flow at the nozzle.
623.2 -MATERIALS : Materials shall meet the requirements specified in the following Sections, Subsections, o r Standards and other requirements as noted below:
MATERIAL SUBSECTION OR STANDARD Accelerating Admixtures 707.13 Air-Entraining Admixtures 707.1 Coarse Aggregate 703.1, 703.2 Curing Materials 7076. -707.10 Fibers* ASTM C1116 Fine Aggregate 702.1 Portland Cement 701.1, 701.3 Supplementary Cementitious Materials** 707.4 Reinforcing Steel 709.1, 709.3, 709.4 Water 715.7 Water Reducing Admixtures 707.3 Water Reducing, Accelerating Admixtures 707.14 Water Reducing, Retarding Admixtures 707.2 * ASTM C1116, Type II or III. Provide a minimum dosage of 1.5 pounds per cubic yard. Use fibers that are a minimum of ½ -inch length, monofilament or collated -fibrillated microfibers. ** The use of a supplementary cementitious materials will not be permitted when a blended hydraulic cement is used.