554.01 Description
This work is the furnishing, handling, transporting, and storage of reinforced precast concrete bridge members, precast curbs, cattle guard bases, box culverts, pipe, and other precast concrete products produced by means of wet-cast, dry-cast, or machine-made (e.g., packer-head) operations.
554.02 Materials
554.02.1 Concrete
Furnish hydraulic cement concrete in accordance with Section 551. Furnish Class General concrete unless otherwise specified. SCC meeting the class general requirements may be used for Precast products provided they meet the additional requirements of Subsection
551.03 2(G).
A.Cement. For precast items installed below grade, furnish low alkali hydraulic cements meeting M85/C150 Type V Portland Cement or M240/C595 Blended Cement with the (HS) designation for sulfate resistance from sources listed on the QPL .
554.02.2 Reinforcing Steel
Furnish reinforcing steel in accordance with Section 555 and Subsection 711.01.
554.02.3 Structural Steel
Furnish Structural steel in accordance with Subsection 711.02.
554.03 Construction Requirements
Construct any products that are not cast-in-place, and not produced at a PCI, ACPA or NPCA certified precast plant, in accordance with Subsection 605.03. These products will be evaluated on a lot-by-lot basis in accordance with Subsection 551.03.8(C) for the class of concrete specified.
554.03.1 Fabrication Drawings
Prior to casting members, submit fabrication drawings and design calculations. Include on/with the fabrication drawings the following information:
1.An erection layout with each member assigned a production number.
2.A tentative fabrication schedule; and
3.All other information necessary to fabricate and install the product. Ensure the submittal includes all information required to check the structural accuracy and fabrication procedures for the structure. Structural shop drawings must be designed and stamped by a professional engineer registered and licensed to conduct engineering in the State of Montana. Do not begin fabrication until the Department approved drawings are received by both the plant and the Department Inspector. Coordinate the fabrication schedule with the Department Inspector.
554.03.2 Design of Concrete Mixtures
Submit a proposed mix design meeting all the requirements of MT 100 for approval annually, between November 15th and April 15th of each year. Any changes to the approved mix design will require resubmittal and approval prior to production. Project specific mix designs not submitted for annual approval will need to be submitted and approved before production begins. 554 – PRECAST CONCRETE PRODUCTS 2020 EDITION V5.1 554-2 For self-consolidating concrete, the 28-day strength may vary with the class of concrete specified in Table 551-2 or contract provisions. The Contractor may request to change aggregate size and gradation to use aggregates in an established plant. Submit the request in writing and include sizes and gradation limits for each size aggregate. Furnish evidence of satisfactory performance of concrete produced from the aggregates. Do not make changes in the aggregates without approval.
554.03.3 Sampling, Handling, Batching, and Mixing
Sample, handle, batch, and mix materials for concrete in accordance with Subsection
551.03 3
.
554.03.4 Forms and Forming
Meet the form requirements in Subsection 552.03.3.
554.03.5 Transporting and Placing Concrete
Transport and place concrete in accordance with Subsections 551.03.5 and 552.03.4.
554.03.6 Curing and Testing Concrete
Cure precast concrete products by water curing, impervious membrane curing, elevated temperature curing, or a combination of these methods. Perform water curing and impervious membrane curing in accordance with Subsection
551.03 7(A).
Perform elevated-temperature steam process curing in accordance with Subsection
551.03 7(C).
Submit procedures for curing by the elevated-temperature electric coil process or a combination of methods in writing for approval before use. Perform at least 1 test per 50 cubic yards (35 m3) or per each day’s production if less than 50 cubic yards (35 m3) to verify fresh properties and compressive strength required to discontinue curing. A test is the average strengths of 3 cylinders, each cast from different batches of concrete used in the day’s production. Take the 3 samples from as many different batches as possible if more than 2 batches are used. Sample and cast cylinders in accordance with MT 101 . Cure until the compressive strength of the standard 6 x 12-inch (152 x 305 mm) or 4 x 8-inch (102 x 203 mm) cylinders, cured under the same conditions as the concrete represented, reaches the required strength for the class of concrete or the specified strength. Field-cure cylinders a maximum 28 days and test for compressive strength within 24 hours after removal from the field curing conditions. Perform strength testing in accordance with AASHTO T 22. Furnish test results by an ACI certified strength testing technician or equivalent that has been verified by the Department or arrange for the tests to be witnessed by the Department. The Department will verify technicians during monthly and annual plant inspections. Test results are acceptable if the average of the 3 cylinder strengths exceed the strength for the concrete class, or the specified strength and no individual cylinder tested has a strength less than 90% of the specified strength. Continue un-interrupted curing until test results are obtained. Should all cylinders be tested without reaching the specified strength, the concrete represented by the cylinders may be rejected. 2020 EDITION V5.1 PRECAST CONCRETE PRODUCTS – 554 554-3
554.03.7 Weather and Temperature Limitations
Submit a written plan for hot or cold weather concreting in accordance with Subsection
551.03.6 when temperature extremes are anticipated.
Furnish concrete at between 50 to 85 °F (15 and 32 °C) for placing when the air temperature is less than 35 °F (2 °C). Heat the concrete in accordance with Subsection 551.03.6(B). Clear form work of snow, ice, and frost before placing concrete. Protect the concrete from freezing for at least 48 hours after its placed or until it reaches the strength required to discontinue curing. After 48 hours, provide freeze protection to develop the required strength. Construct and protect bridge components in accordance with Subsection 551.03.6(B). Assume all risk of concrete work during cold weather.
554.03.8 Form Removal
Remove lateral support forms only when it does not damage the concrete. Do not interrupt curing and protection in excess of 30 minutes for form removal.
554.03.9 Finish on Exposed Surfaces
Produce concrete surfaces free from rock pockets, depressions, or projections. Scattered holes from surface trapped air are not considered defects. Point holes larger than ½-inch (13 mm) in any direction with mortar and strike off even with the surface. Apply an ordinary finish to surfaces not smooth and uniform in texture and appearance in accordance with Subsection 552.03.11.
554.03.10 Handling, Transporting, and Storage
Do not remove, handle, or transport items designed to carry loads from the casting bed before they reach the required strength. Other items may be moved from the casting bed to other curing locations when they have reached the strength to prevent damage. Replace all cracked or broken items at Contractor expense. Handle, transport, and store precast concrete items without damage. Replace or repair all damaged items at Contractor expense.
554.04 Method of Measurement
554.04.1 Precast Concrete Curb
Precast concrete curb is measured in accordance with Subsection 609.04.
554.04.2 Precast Concrete Barrier Rail
Precast concrete barrier rail is measured in accordance with Subsection 605.04.
554.04.3 Plain Reinforced Precast Concrete Bridge Members
Plain reinforced precast concrete bridge members are measured in accordance with Subsection 553.04.
554.04.4 Precast Concrete Cattle Guard Bases
Precast concrete cattle guard bases are not measured or paid for separately but are included in the payment for cattle guards in accordance with Subsection 611.05.
554.04.5 Precast Concrete Guardrail Posts
Precast concrete guardrail posts are not measured or paid for separately but are included in the payment for metal guardrail in accordance with Subsection 606.05. 554 – PRECAST CONCRETE PRODUCTS 2020 EDITION V5.1 554-4
554.04.6 Other Precast Concrete Products
Other specified precast concrete products are measured and paid for as specified in the contract.
554.05 Basis of Payment
Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Precast Concrete Curb See Subsection 609.05 Precast Concrete Bridge Members See Subsection 553.05 Precast Concrete Median Barrier Rail See Subsection 605.05
Referenced in this section
Sections that cite this one
Precast Concrete Products in other states
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Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 347–350 of 611. View official source ↗