614.1Description
This work consists of providing, mixing, transporting, placing, finishing, curing, and grinding Ultra High- Performance Concrete (UHPC).
614.2Materials
A.Ultra-High Performance Concrete Section 1025
B.Water and Ice Section 1021
C.Liquid Membrane-Forming Compounds Section 1045.7
614.3Construction
614.3.1 Submittals
A.Submit a Quality Control Plan to verify that all materials, equipment, and workmanship meet the
contract requirements. Provide detailed personnel, equipment, methods, sequence, and procedures to ensure the specified quality of all applicable materials and related field operations. Follow the submittal procedures outlined in Section 105.4. Provide the following information in the plan, as applicable:
1.Batch proportions, production sequence, and production rates.
2.Allowable ambient temperature and weather conditions for mixing and placement.
3.Construction loads with locations applied to the bridge during UHPC placement.
4.Surface preparation procedures, including cleaning and pre-wetting.
5.When performing closure pours, provide:
a.Formwork information, including materials and removal.
b.Locations of construction joints.
c.Placement procedures.
d.Procedures for supplemental heating of surrounding prefabricated elements.
6.Method of curing, including means and materials.
C.Temperature Control Plan. When temperature ranges fall outside of the manufacturer’s
recommended placement temperatures, submit a Temperature Control Plan in accordance with Section 610.3.1 and the manufacturer’s recommendations.
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, finishing, and curing of the UHPC. 614.3.2 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 ponding 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.
614.3.3 Formwork
A.Design and fabricate formwork in accordance with Section 604.3.2 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 10-ksi is achieved.
614.3.4 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. 614.3.5 Sampling and Testing
A.Sample and make test specimens in accordance with ASTM C1856 as directed by the engineer.
B.Perform slump flow test in accordance with ASTM C1437, as modified by ASTM C1856, at a
minimum rate of 1 test per batch.
C.Additional quality control tests may be performed at the discretion of the engineer, the contractor
and the UHPC manufacturer. 614.3.6 Placing 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.Place UHPC flush with adjacent precast elements to within a tolerance of plus 1/4-inch and minus
0-inches.
C.Use in-place temperature monitors to monitor curing temperatures.
D.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.
2.Supplemental heat may be provided to the UHPC and surrounding prefabricated elements to
reduce initial set times and accelerate strength gain. 614.3.7 Surface Profile and Finish
A.After curing, grind the UHPC surface smooth with adjacent concrete elements after the UHPC has
achieved a minimum compressive strength of 10-ksi.
B.During grinding operations, if steel fiber pullout is observed, suspend the grinding, and do not
resume until approved by the engineer.
C.Perform a watertight integrity test on 10-percent of the joints after grinding has been completed.
1.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.
2.The Engineer will inspect the underside of the joint for water leakage at 30-minutes and at 1-
hour.
3.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.
D.Traffic is not permitted on the bridge until the UHPC has achieved a minimum compressive
strength of 14-ksi. 614.3.8 Reporting
A.Submit all quality control test results and a report in accordance with ASTM C1856.
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
Referenced in this section
Delaware revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 273–0 of 786.
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