ULTRA HIGH -PERFORMANCE CONCRETE SECTION 614 265 C. Temperature Control Plan. When temperature ranges fall outside of the manufacturer’s recommended placement temperatures, submit a Temperature Control Plan in accordance with
D.Prior to the start of UHPC placement, schedule an on -site meeting with the UHPC manufacturer’s
representative, the Contractor, and the Engineer to review the approved Quality Control Plan and clearly outline the procedures for mixing, transporting, fini shing, and curing of the UHPC.
614.32 Surface Preparation
A.Prior to placing UHPC, pre -wet surfaces to a saturated surface dry (SSD) condition, in accordance
with the UHPC manufacturer’s recommendations. An SSD condition is defined as a concrete surface that has absorbed the maximum amount of water without pondi ng on the surface.
B.For UHPC closure pours, create an exposed aggregate, 1/4-inch amplitude finish on all concrete
surfaces that will be in contact with UHPC.
1.Achieve SSD by placing wet burlap on the surface for a minimum of 24 -hours or by other means
submitted for approval by the engineer.
2.Use compressed air, free of oil, to blow out any standing water.
3 Formwork
A.Design and fabricate formwork in accordance with Section 604.03.2 and the recommendations of
the UHPC manufacturer.
1.Construct forms from a nonabsorbent homogeneous material that is properly sealed and
capable of resisting the hydrostatic pressures from UHPC in the unhardened state.
2.Cover all UHPC closure pours with a top form with a moisture barrier.
3.Do not remove formwork until a compressive strength of 1 0-ksi is achieved.
4 Mixing
A.Mix UHPC batches in accordance with the manufacturer’s requirements.
B.Provide a minimum of two portable batching units for mixing of the UHPC. Mixing equipment
which is not supplied by the UHPC manufacturer must be reviewed by the UHPC manufacturer for adequacy.
C.A representative from the UHPC manufacturer must be present during mixing, transporting,
placing, finishing, and curing of the UHPC.
5 Placin g and Curing
A.Place and cure the UHPC in accordance with the manufacturer’s recommendations, the Quality
Control Plan, and the Temperature Control Plan.
B.Use in -place temperature monitors to monitor curing temperatures.
C.When placing UHPC closure pours:
1.Do not internally vibrate the UHPC. Rodding may be used to achieve a suitable blended
connection where two successive pours meet. ULTRA HIGH -PERFORMANCE CONCRETE SECTION 614 266 2. Supplemental heat may be provided to the UHPC and surrounding prefabricated elements to reduce initial set times and accelerate strength gain. 614. 3.6 Surface Profile and Finish
A.Finish surfaces of UHPC closure pours to be flush with adjacent precast elements to within a
tolerance of plus 1/4-inch and minus 0 -inches by grinding.
1.Grind the UHPC surface after the UHPC has achieved a minimum compressive strength of 10 -ksi.
2.During grinding operations, if steel fiber pullout is observed, suspend the grinding, and do not
resume until approved by the engineer.
3.Perform a watertight integrity test on 10 -percent of the joints after grinding has been
completed.
a.Continuously apply running water at a rate of 300 -gallons per hour along the length of the
joints to be tested, for a duration of 30 -minutes.
b.The Engineer will inspect the underside of the joint for water leakage at 3 0-minutes and at 1 -
hour.
c.The joint is considered watertight if no dripping water or water droplets are visible
underneath precast concrete element areas along the full length of the joint. If the results of the watertight integrity test are not satisfactory, the engineer will determine the required corrective action.
4.Traffic is not permitted on the bridge until the UHPC has achieved a minimum compressive
strength of 14 -ksi.
614.4Method of Measurement
A.The Department will measure the quantity of UHPC Closure Pour as the number of cubic feet of
UHPC placed and accepted.
614.5Basis of Payment
A.The Department will pay for UHPC Closure Pour at the contract unit price per cubic foot. Price and
payment constitute full compensation for:
1.Quality Control Plan;
2.formwork;
3.providing and placing all materials;
4.mixing and transporting; and
5.finishing, curing, and grinding.
ITEM DESCRIPTION UNIT 614000 UHPC CLOSURE POUR CF STEEL STRUCTURES SECTION 615 267 SECTION 615 — STEEL STRUCTURES
615.1Description .
This work consists of providing, fabricating, and erecting steel structures and structural steel elements of other structures.
615.2Materials .
A.Coatings Section 616
B.Bearing Materials Section 623
C.Structural Steel Section 1039.1
D.Fasteners Section 1039.2 and 1039.3
E.Anchor Bolts Section 1039.4
F.Welded Shear Connectors Section 1039.5
G.Forgings, Shaftings, and Castings Section 1039.6 and 1039.7
H.Sheet Zinc and Copper Section 1039.9
I.Galvanizing Section 1039.10
615.3Construction.
A.Submittals :
1.Certifications.
a.For structural steel, provide documentation that the fabricator has the AISC Certified Steel
Bridge Fabricator – Advanced Certification (ABR).
i.For fracture -critical bridges, provide additional documentation that the fabricator has the
AISC Fracture Critical Endorsement.
b.For welding, all welders shall possess a current AWS welder’s qualification card, which shall be
available upon request at all times.
2.Shop Drawings.
a.Prepare and submit shop drawings at least 30 calendar days before fabrication for each detail
of the plans requiring the use of structural steel, forgings, wrought iron, or castings in accordance with AASHTO/NSBA Steel Bridges Collaboration G1.3 Shop De tail Drawing Presentation. In addition to the AASHTO/NSBA requirements, include the following:
i.Joint details for all welds.
ii. Bill of material on each sheet. iii. Charpy V -Notch (CVN) requirements for each piece. iv. Fracture -critical requirements for each piece including indicating fracture -critical areas of members.
v.Title block in the lower right corner of each sheet with the following information:
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 275–277 of 779.