503.05 Basis of Payment.
503.05 Basis of Payment.
a.Unit Price Coverage .
1.Seal Concrete . Accepted seal concrete, used as directed and measured as noted above, will be paid at the contract price, which shall be full compensation for the concrete complete in place exclusive of reinforcing steel.
2.Cofferdam and Pumping . When Cofferdam and Pumping has been provided for a designated pier or bent, the lump sum item shall be full compensation for the furnishing and installation of all material, dewatering, maintenance, removal, satisfactory clean up of the area, and for all tools, equipment, labor and incidentals necessary to complete the work. Partial payment after installati on of cofferdam will be made based on the following: Cofferdam complete in place 80% Excavation performed and columns poured to elevation above normal water elevation 90% Cofferdam work complete and sheet piling removed 100%
3.Core Drilling . Payment for the length of core drilling shall be full compensation for all materials, equipment, tools, labor and incidentals necessary to complete the work. Should the quality of the concrete be questionable based on the first cores taken from the footing, the Engineer may order additional cores to be taken from the footing. All additional coring shall be at the Contractor's expense if the footing is determined to be unsatisfactory. If the footing is determined to be satisfactory, the cost of the additiona l coring will be paid for at the contract unit price bid per linear foot.
4.Concrete for Rock Subfootings . The Contractor will be paid the delivered invoice cost, minus waste and including any applicable sales taxes, to the project plus 15 percent. This price includes the concrete, gross receipt tax, labor, materials, incidentals, and the placing of the concrete in the designated locations.
b.Payment will be made under Item No .: 503-A Seal Concrete - per cubic yard {cubic meter} 503-B Cofferdam and Pum ping, Pier No. ____ or Bent No. ____ - per lump sum 503-C Core Drilling Seal Concrete Footings - per linear foot {meter} 503-E Mass Structural Seal Concrete – per cubic yard {cubic meter} STEEL PILING ENCASEMENT
504.01 Description.
The work covered by this Section consists of constructing reinforced concrete encasements on steel piling for existing bridges as shown on the plans or directed by the Engineer. The work shall include the partial removal of existing pi ling encasement to the limits shown on the plans, cleaning existing piling, excavation, construction of the encasements and any other incidental work or material necessary for the encasement of the piling as shown on the plans or directed by the Engineer.
504.02 Materials.
Reinforcing steel material shall be furnished in accordance with the material requirements given in Section 502. The Contractor’s concrete producer shall establish the proportions for the concrete mix following the guidelines given in ALD OT-170, "Method of Controlling Concrete Operations for Structural Portland Cement Concrete", and the design criteria given in this Subarticle. The concrete supplier shall submit the proposed concrete mix design to the Materials and Tests Engineer for appro val following the requirements given in ALDOT -170. The distribution of approved concrete mix designs and the re -approval of concrete mix designs will be in accordance with the requirements given in ALDOT- 170. Any changes
504.03 Construction Requirements.
of the materials or proportions of a mix design shall be noted in a revised mix design that shall be submitted for approval. Concrete for steel pile encasements shall meet the requirements of Class B as defined in Item 501.02(c)2 with the following exceptions : • Type II or Type IL cement co ntaining a maximum of 8% C3A shall be used. • The slump range shall be from 6 inches to 8 inches {150 mm to 200 mm} during placement. Form material shall be capable of withstanding the pressure of the placement of the concrete. Rigid forms shall be used for the construction of the encasements. Fabric forms will not be allowed. The epoxy mortar used to seal the forms shall be made from an approved Type I epoxy adhesive. The mix proportions of the epoxy adhesive and aggregate shall be those recommended by the manufacturer of the epoxy adhesive.
504.03 Construction Requirements.
a.General . The Engineer will make the final determination of whether the construction of a piling encasement should be done in either a wet or dry condition. An encasement must be constructed in the wet condition if the pile encasement site cannot be dewatered by pumps. The required lengths of encasement shown in the listing of quantities on the Plans are approximate. The actual required lengths of encasement may vary from the appro ximate lengths shown on the plans. The Contractor shall abide by the rules of navigation so as to permit the orderly passage of marine traffic at the site. The Contractor shall repair, without compensation, all damage done to the bridge due to performance of this work. The Contractor shall perform no work, except the pumping of the concrete, from the deck of the bridge. Forms shall not be removed until after the concrete has cured to a compressive strength of 2500 psi {17 MPa}. All forms shall be completely removed to allow the inspection of the encasement. An unacceptable encasement shall be removed and replaced with an acceptable encasement without additional compensation. All materials at a work site (forms, old encasement materials, swaybracing, tools, equipment, etc.) that are not required as a permanent part of the bridge structure shall be removed.
b.Cleaning of Piling . All steel pile surfaces to be encased shall be thoroughly cleaned of all marine growth, heavy rust, foreign materials, oil, grease, dirt, etc. Cleaning may be done either by high pressure water jet (8700 psi {60MPa} or more) or by other mechanical methods approved by the Engineer. The Contractor shall repaint all sections of piling where paint was removed during cleaning.
c.Placeme nt of Steel Reinforcement . All steel reinforcement shall be placed in accordance with plan details using non -metallic spacers to provide the required concrete cover over the reinforcing steel and pilings. All tie wires shall be turned toward the pile.
d.Encasements Constructed in Wet Conditions .
1.Underwater Inspection . The Department’s divers will inspect the encasement work. The inspection shall be as follows: • The Contractor shall complete all of the excavation, cleaning and placement of reinforcing steel for all of the encasements required for at least one Bent. • At the completion of all of the excavation, cleaning and placement of reinforcing steel for all of the encasements required for at least one Bent, the Contractor shall notify the Engi neer of the need for an inspection. • The Contractor shall notify the Engineer, and the Engineer will notify the ALDOT Underwater Inspection Team Supervisor at least 48 hours prior to the need for the inspection. • The Department’s divers will also perform o ther inspections as needed and a final inspection of the completed encasement work.
504.04 Method of Measurement.
2.Placement of Concrete. The bottom of an encasement form shall be tightly sealed with epoxy mortar to prevent the concrete placed to fill a form from flowing out of the form. Care shall be taken to not block the bottom pumping port with the concrete or epoxy mortar seal at the bottom of a form. The filling of an encasement form shall be done by pumping concrete through ports installed on the form. Lubricating agents place d in a pump hose shall not be pumped into an encasement form. The concrete shall be pumped until undiluted concrete is present in all areas of the encasement.
e.Encasements Constructed in Dry Conditions . The filling of an encasement form may be done by p umping concrete through ports installed on the form or by tremie. Lubricating agents placed in a pump hose shall not be pumped into an encasement form.
504.04 Method of Measurement.
The quantity of steel piling encasement measured for payment will be the total linear feet {meters} of encasement, measured to the nearest tenth of a foot {meter}, from the top of the encasement to the bottom, including any partial encasement where existing concrete is covered.
504.05 Basis of Payment.
a.Unit Price Covera ge. Accepted steel piling encasement, measured as noted above, will be paid for at the contract unit price bid per linear foot {meter} of encasement. This bid price shall include the cost of the cleaning and scarifying or partial removal of steel piling en casements, pile cleaning, excavation, concrete, reinforcement steel, forming, labor, equipment, tools, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 504-G Steel Piling Encasement, * - per linear foot {meter} * show either Wet Condition or Dry Condition. SECTION 505 PILING
505.01 Description.
This Section shall cover the work of furnishing and driving foundation piles of the type and dimensions designated including cutting off or building up foundation piles, when required. Piling shall be furnished and installed in accordance with the requirements given in these specifications at the location, tip elevation, penetration and/or bearing shown on the plans or as directed by the Engineer.
505.02 Materials.
a.General. All materials shall meet the requirements specified in applicable portions of Section 834, Piling.
b.Galvanized Piling.
1.General. Where required on the plans, steel piles shall be hot dip galvanized. If swaybracin g is used on these piles, the swaybracing will also be hot dip galvanized.
2.Surface Preparation. The galvanizer shall pre -clean the material to be galvanized in accordance with accepted methods to produce an acceptable surface for hot dip galvanizing.
3.Shop Galvanizing. Hot dip galvanizing of iron and structural steel shapes shall be produced utilizing lead free technology. Steel piles shall be hot dip galvanized in accordance with the latest ASTM A 123 Specification to provide a uniform minimum coating thickness of 3.5 mils (89 μm). Shop repair of coatings not meeting the above minimum thickness requirements will not be allowed. Galvanizing practices and procedures shall protect against possible embrittlement of the steel as described in ASTM A 143. Inspection and testing of hot dip galvanized coatings shall be done under the requirements of ASTM A 123.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 315–316 of 934.