5-158
1.Fully dimensioned views showing the geometry of the units, i ncluding all projections, recesses, notches, openings, block outs, keyways a nd chamfers.
2.Details and bending schedules of reinforcing steel including the size, spacing, and location. Reinforcing provided under lifting devices shall be shown in detail.
3.Details and locations of all items to be embedded. 4. Total weight of each unit. Concrete mix designs shall be pa rt of the Working Drawing submi ttal. Include aggregate specific gravity, absorption, percent fracture, finen ess modulus and gradation as part of the mix design. Provide the mix design calculations de monstrating how the batch weights, water-cement ratio and admixture dosage rate were dete rmined.
534.04 Design Requirements The C ontractor shall design the pr ecast structural
concrete structure in accordance with the AASHTO LRFD Bridge De sign Specifications, latest edition. The HL-93 live load specified in the AASHTO LRF D Bridge Design Specifications shall be used for all limit states, except for S trength I. The live load used for the Strength I limit state shall be the Maine Modified live loa d, which consists of the standard HL-93 Live Load with a 25 percent increase in the Desi gn Truck only. (Wheel loads based on the Design Truck shall be increased 25 percent). Additionally, if the governing load rating factor based on the HL-93 live load is eq ual to or less than 1.10 and the span is 14 feet, or greater, then a load rating based on th e Maine legal truck (Configuration #6) shall also be checked to insure the rating f actor is equal to, or greater than, 1.0. The live load deflection check, per AASHTO LRFD Bridge Design S pecifications, for the top slab of box culverts and frames with clear spans of 15 feet, or greater, and cover depths of 4 feet, or less, is mandatory. The live load deflec tion check shall be documented in the design computations submittal. Design calculations that consist of computer program generated output shall be supplemented with at least one hand calculation and graphics de monstrating the design methodology used. The hand calculation shall document, at a min imum, the Strength I load case flexural design check of the top slab positive moment rein forcing steel. Design calculations shall provide thorough documentation of the source s of equations used and material properties. The design shall be load rated in accordance with the AASHTO Ma nual for Bridge Evaluation, latest edition, by the LRFR method and in accordanc e with the Department Load Rating Guide. The Contractor shall submit design calculations and load rating , if applicable, for the precast structure to the Department for review. A Professional Engineer, licensed in accordance with State of Maine laws, shall sign and seal all de sign calculations and drawings. 5-159 The Contractor shall submit the following items for review by t he Department, at least forty-five Working Days prior to production:
A.The name and location of the manufacturer B. Method of manufacture and material certificates C. Description of method of handling, storing, transporting, an d erecting the units
D.Design computations (bound and indexed) E. Load rating computations and c ompleted load rating form (bou nd and indexed)
534.05 Facilities for Inspection Provide a private office at the fabrication plant for the
Department’s inspection personnel, or Quality Assurance Inspect ors (QAI’s), in accordance with Section 535.05, Facilities for Inspection. Failure to comply with the above requirements will be considere d denial of access to the Work for the purpose of inspection. The Department will reject all Work done when access for inspection is denied.
534.06 Notice of Beginning Work Refer to Section 712.061.
534.07 Quality Control Quality Control (QC) is the responsibil ity of the Contractor.
Provide a copy of the Quality System Manual (QSM) to the Fabric ation Engineer, if requested. Inspect all aspects of the Work in accordance with the Contract or’s QSM. Reject materials and workmanship that do not meet Contract requirement s. Record measurements and test results on the appropriate forms f rom APPENDIX E of Precast/Prestressed Concrete Institute Manual for Quality Contr ol for Plants and Production of Structural Precast Concrete Products (MNL 116), or an equiva lent form prepared by the user. Provide copies of measurements and test results to the Q AI as follows: Type of Report When Provided to QAI* Aggregate gradations-fine aggregate and coarse aggregate Prior to beginning work and at least once a week thereafter Material certifications /calibration certifications Prior to beginning work (anticipate adequate time for review by QAI) Pre-placement inspection report Prior to the concrete placement Concrete batch slips The morning of the next work day Results of concrete testing The morning of the next work day Concrete temperature records Provide with compressive strength testing Nonconformance reports/repair procedures Within 24 hours of dis covery Results of compressive strength testing (for design strength) Prior to stopping curing / Prior to final acceptance Post-placement inspection report Prior to final acceptance
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 450–451 of 817.