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General Provisions (00100-00999)

809PRECAST/PRESTRESSED STRUCTURE CONCRETE MASONRY

RI · 2024 Standard SpecificationsBook pages 402404View official source ↗

8−68 measured for payment.

808.05 Basis of Payment.

808.05.1 Structure Concrete Masonry. The accepted quantities of "Structure Concrete Masonry"

will be paid for at the respective contract unit prices per cubic yard as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials and equipment, and all incidentals required to finish the work, complete and accepted by the Engineer. 808.05.2 Joint Fillers. The accepted quantities of "Joint Fillers" will be paid for at the respective contract unit prices per square foot as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment, and all incidentals required to finish the work, complete and accepted by the Engineer. 808.05.3 Joint Sealants. The accepted quantities of "Joint Sealants" will be paid for at the respective unit prices per cubic inch or linear foot, as the case may be, as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials and equipment, and all incidentals required to finish the work, complete and accepted by the Engineer.

808.05.4 Concrete Finishes. The accepted quantities of "Rubbed Finish" and "Bushhammered or Sand Blasted Concrete Finish" will be paid for at the respective contract unit prices per square foot as listed in the Proposal. The prices so-stated constitute full and complete compensation for all labor, materials, and equipment, and for all incidentals required to finish the work, complete and accepted by the Engineer.

There shall be no separate payment for float finish and concrete deck or wearing surface finish as they are included in the price of the concrete.

809.01 DESCRIPTION. The work of this Section consists of the provision of precast, prestressed,

concrete elements, both pre-tensioned and post-tensioned, at the locations and to the details indicated on the Plans, all in accordance with these Specifications. 809.01.1 General . Prestressed concrete structural elements shall be manufactured in accordance with the publication of the Prestressed Concrete Institute titled Manual for Quality Control for Plants and Production of Precast and Prestressed Concrete Products , MNL 116, current edition. This manual provides principles and guidelines for the manufacture of prestressed concrete products. 809.01.2 Compensation for Out-of-State Inspection Services.

a.Basis of Compensation. In the event that a Contractor selects a subcontracting 8−69company that is beyond a 50-mile radius of t he Department's base of operation, deemed to be the State Office Building, the Contractor shall compensate the State for the costs of travel and inspection services, as outlined in Subsection 809.05; Basis of Payment for the days of inspection services as identified herein.
b.Definition of Inspection Services. The Department will conduct inspections of the plant and laboratory, witnessing of trial batches, full-time acceptance testing and part-time Independent Assurance Sampling and Testing (as defined in the Department's Materials Section Master Schedule) for all phases of production, repair of products, loading, shipping and any other related operations, including travel days, as deemed necessary by the Engineer. Inspection services days or part thereof shall also in clude weekends, holidays and shutdowns due to the Contractor's inability to produce. 809.02 MATERIALS.

809.02.1 Drawings.

a.Contract Plans. Plans which accompany the contract documents are designated as contract Plans. These are not intended to be shop drawings.
b.Shop Drawings. The Contractor shall submit complete and accurate shop drawings to the Engineer for approval in accordance with Subsection 105.02, Plans and Shop Drawings. The Contractor shall be responsible for modifying the di mensions of prestressed units to compensate for elastic shortening, shrinkage, grade corrections and other phenomena that make in-process fabricating dimensions different from those shown on the Plans. Approval of the shop drawings by the Engineer shall not relieve the Contractor from the responsibility for the correctness of all dimensions shown on these drawings. These drawings shall be made as soon as possible after the award of Contract and they shall be designated as shop drawings. No fabrication shall take place until after the shop drawings have been approved and the Engineer has received prints made from the approved shop drawings.
1.Information Required on Shop Drawings. The shop drawings s hall include but not be limited to the following information:
a.Plan layout of structure indicating the piece mark assigned to each precast/prestressed unit.
b.A tensioning and detensioning schedule for all products to be fabricated.
c.Complete details, including anticipated initial and shipping cambers, tensioning force (initial and final), concrete compressive strength for stripping of forms (for precast elements, load transfer strength for prestressed elements, handling strength and 28-day strength for shipping), class of concrete, and type and location of lifting devices.
d.Shop drawings shall clearly indicate all deviations from the precast/prestressed unit details shown on the Plans.
e.For drawings and other relevant documentation for prestressed concrete elements refer to "Prestressed Concrete Notes" indicated on the Plans. 8−70
2.Information Required with Shop Drawings. The following information shall be submitted with the shop drawings.
a.The name of the manufacturers of the reinforcing and prestressing steels, including alternate sources and appropriate Certificates of Compliance.
b.Material and manner of sealing the exposed portions of the prestressing steel.
c.Calculations of strand elongation for each unique casting length (grip-to-grip).
d.Proposed method of handling and transporting pr estressed concrete units to the project site.
e.Submission for the Engineer's approval of a detailed plan for curing the precast/prestressed elements. This detail plan shall include the following:
1.Curing Method.
2.Providing for enclosures, indicating method of holding down enclosure safely in place. (3) Heating devices, types and location around the structure.
4.Method of monitoring time/temperature of hardened concrete.
5.Backup systems as required. The Engineer will review shop drawings within forty-five (45) calendar days. A set of shop drawings is deemed to be all drawings received by the Engineer from the Contractor for a particular contract on any calendar day. If the shop drawings are detained for examination for a period longer than that stated above, such detention will be taken into account when considering application by the Contractor for an extension of time for the completion of the Contract. 809.02.2 Concrete . The Contractor shall be responsible for designing a concrete mix to produce the strength and other characteristics specified on the Plans in accordance with the applicable requirements of SECTIONS 601 and M.02; PORTLAND CEMENT CONCRETE.

809.02.3 Steel. Except as noted herein, reinforcing steel shall conform to the requirements of

SECTION 810 of these Specifications and as shown on the Plans. All reinforcing steel used in the fabrication of precast /prestressed concrete structural elements shall be tested before being placed in any of the products.

a.Other Requirements. Steel components shall also conform to the following additional requirements.
1.Chairs or other devices necessary to ensure the proper placement of steel items shall be galvanized, plastic or epoxy coated and must be capable of supporting the loads without deformations, all as approved by the Engineer.
2.Prestressing steel shall meet the requirements of Subsection M.05.03 of these Specifi- cations.
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 402404 of 826.