503STRUCTURE FOUNDATIONS

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the Contractor shall construct another foundation or perform corrective work as required by the Department. This foundation or the corrective work shall be constructed without compensation from the Department. The details of the replacement foundation shall be submitted in accordance with the requirements given in Article 105.02 for Working Drawings. Unless otherwise directed by the Engineer, all footings shall be cored to a point 6 inches {150 mm} above the bottom of the seal concrete footing.

Structural seal footings designated as mass concrete shall meet the requirements found in Subarticle 510.03(d) and Article 510.04.

The class of concrete required for the specific type of work involved shall be in accordance with the provisions of Section 501.

In general, each footing shall be constructed as a monolith. If construction joints are required, they shall be constructed as provided in Section 501.

Concrete surfaces shall be finished in accordance with the provisions of Section 501 for Class 1 with exposed surfaces receiving a Class 2 finish unless otherwise specified by the proposal or by plan requirements.

503.04Method of Measurement

The measurement of the volume of seal concrete in a footing shall be calculated from the following:  L = Length of footing shown on contract plans (feet {meters});  W = Width of footing shown on contract plans (feet {meters});  T = Final approved elevation of the top of the seal footing (feet {meters});  D = Final approved elevation of the bottom of the seal footing (feet {meters});  Vs = Volume of seal concrete for which payment will be made (cubic yards {cubic meters}).  Vs = L x W x ( T - D ) / 27 {Vs = L x W x ( T - D )} Seal concrete outside of these limits of measurement may be required for the construction of a seal concrete footing, depending on the details of construction selected by the Contractor. No direct payment will be made for any seal concrete outside of the footing plan dimensions shown on the contract plans.

When items for cofferdam and pumping for individual piers or bents are provided by the plans and/or proposal, such will be measured in individual lump sum items for the pier or bent designated.

Excavation and backfill when provided by the plans, proposal, or directed will be measured and paid for under the applicable provisions of Sections 214 and 215.

The actual depth of each core hole drilled at the location directed will be measured in feet {meters} to the nearest 0.1 of a foot {meter}.

Concrete ordered and accepted for filling voids, cracks, and crevices, as required in Item

503.03(c)1, will be measured by the cubic yard {cubic meter} delivered to the work site and acceptably

placed, minus any concrete wasted.

503.05Basis of Payment

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. STEEL PILING ENCASEMENT 313

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 installation 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%

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 additional coring will be paid for at the contract unit price bid per linear foot.

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.

503-A Seal Concrete - per cubic yard {cubic meter} 503-B Cofferdam and Pumping, 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

504.01Description

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 piling 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.

504.02Materials

Reinforcing steel material shall be furnished in accordance with the material requirements given in The Contractor’s concrete producer shall establish the proportions for the concrete mix following the guidelines given in ALDOT-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 approval 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 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,Type IL, Type IP or Type IScement containing 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. STEEL PILING ENCASEMENT 314

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.

504.03Construction Requirements

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 approximate 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.

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.

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 wiresshall be turned toward the pile.

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 Engineer 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 other inspections as needed and a final inspection of the completed encasement work.

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 placed 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.