CONCRETE OVERLAYS SECTION 625 334 b. Areas determined to be delaminated by the Department sounding the deck will have to be removed and replaced at the Contractor’s expense.
c.Crack repairs must be performed in accordance with Section 628.3.B .
2.Groove the surface in accordance with Section 610.3.4.i when the overlay concrete has reached
design strength.
3.Apply Silane Sealer that complies with Section 1045.3 to the grooved surface as specified in
625.4Method of Measurement.
A.The Department will measure:
1.Concrete overlay material by the cubic yard.
2.Concrete overlay installation by the square yard – inch.
625.5Basis of Payment.
A.The Department will pay for providing overlay material at the contract unit price per cubic yard.
Price and payment will constitute full compensation for the material and delivery to project site.
B.The Department will pay for placing overlay material at the contract unit price per square yard -
inch . Price and payment will constitute full compensation for:
1.Surface preparation;
2.placing the bonding grout or primer coat;
3.placing, consolidating, curing and grooving the concrete overlay; and
4.constructing and removing test patches.
C.The Department will pay for:
1.Removal and repair work below the initial milling in accordance with Section 628;
2.milling of concrete or hot mix in accordance with Section 760 ;
3.providing and placing silane sealer in accordance with Section 613 ; and
4.providing and placing the methac rylate sealer in accordance with Section 613.
D.The Department will make no additional payment for repair work as directed by the engineer.
ITEM DESCRIPTION UNIT 625000 PROVIDING POLYESTER POLYMER CONCRETE OVERLAY CY 625001 PROVIDING LATEX -MODIFIED CONCRETE OVERLAY CY 625004 PROVIDING MODIFIED CLASS D PCC OVERLAY CY 6250 10 LATEX -MODIFIED CONCRETE OVERLAY PLACEMENT SY-IN 6250 11 POLYESTER POLYMER CONCRETE OVERLAY PLACEMENT SY-IN 6250 12 MODIFIED CLASS D PCC OVERLAY PLACEMENT SY-IN
CONCRETE OVERLAYS SECTION 625 335 METAL RAILINGS SECTION 626 336 SECTION 626 — METAL RAILINGS
626.1Description.
This work consists of fabricating, providing, and installing metal railings.
626.2Materials.
A.Elastomeric Pads Section 623
B.Steel Section 1039
C.Anchor bolts Section 1039
D.Aluminum Section 1044
626.3Construction.
A.Submittals
1.Prepare and submit working drawings for the metal railings in accordance with Section 105.
Show all details of the railings and of the materials proposed for use. Obtain the engineer’s approval before fabrication.
B.Fabrication
1.Fabricate formed sections of steel rail from mild steel.
2.The Department will allow use of standard steel pipe for pipe sections.
3.Grind or fill exposed welds to provide a smooth surface.
4.Weld aluminum materials using an inert gas -shielded, electric, arc -welding process using no
welding flux in acc ordance with AWS D1.2 Structural Welding Code - Aluminum .
5.Cut aluminum by means other than torch or flame cutting. Grind smooth rough or sharp
corners.
6.After fabrication, galvanize anchor bolts, nuts, and all steel portions of rails. Leave aluminum
portions ungalvanized. Repair minor abrasions in galvanized surfaces with zinc -rich paint.
C.Packaging, Handling , and Storage.
1.Handle, pack, ship, and store the materials in a manner that will protect the finish from damage.
2.Store railing and incidental parts on blocking, racks, or platforms preventing contact with
ground. Protect the railing and incidental parts from corrosion or damage. Keep the materials free from dirt, oil, grease, and other foreign material. Repair or replace damaged material, as directed by the engineer.
D.Installation .
1.Set anchor bolts and hold in place with a template before pouring concrete. Apply a protective
coating of grease or oil to the parts of anchor bolts exposed above the finished concrete before pouring. METAL RAILINGS SECTION 626 337 2. Set each post base on a preformed elastomeric pad. Conform the outline of the pad to the base of the post or base plate. Set posts plumb and set rails parallel to grade, unless otherwise noted in the contract.
3.Place rails after releasing the span falsework. Adjust metal rails before anchoring to ensure
proper matching at abutting joints, correct alignment, and camber throughout the length. Drill holes for field connections with the rails in place.
4.In areas where aluminum alloys come in contact with other metals or concrete, coat with a
dielectric aluminum -impregnated caulking compound, or place a synthetic rubber gasket between the 2 surfaces.
5.Grind smooth rough or sharp corners. Burr anchor bolts and other connecting bolts and
fasteners to prevent loosening after completing erection.
6.Repair areas of damaged coating with the same coating material in accordance with the
manufacturer’s recommendation. Before requesting acceptance of the installation, clean the railing. Use cleaning methods and agents in accordance with the recommendati ons of the rail manufacturer.
626.4Method of Measurement.
A.The Department will measure metal railings as the number of linear feet fabricated, placed, and
accepted.
626.5Basis of Payment.
A.The Department will pay for accepted quantities at the contract unit price per linear foot. Price
and payment will constitute full compensation for providing, fabricating, and installing all materials, and for repair of any damage due to construction. ITEM DESCRIPTION UNIT 626000 STEEL PEDESTRIAN RAILING LF 626001 STEEL RAILING, TYPE 1 LF 626002 STEEL RAILING, TYPE 2 LF 626010 ALUMINUM PEDESTRIAN RAILING LF 626011 ALUMINUM RAILING, TYPE 1 LF 626012 ALUMINUM RAILING, TYPE 2 LF
CONCRETE REPAIR AND REHABILITATION SECTION 628 338 SECTION 628 — CONCRETE REPAIR AND REHABILITATION
628.1Description.
This work consists of repairing or rehabilitating concrete structures.
628.2Materials.
A.Portland Cement Concrete (PCC) Section 1022 and
B.Reinforcement and Splice Couplers Section 1037
C.High Molecular Weight Methacrylate Crack Sealer Section 1045
D.Non -Shrink Grout Section 1047 .2
E.Epoxy Grout Section 1047 .4
F.Epoxy Injection System ACI 503.7 -07
G.Epoxy Bonding Agent ASTM C881
H.Low or Medium Modulus, Neutral -curing, Silicone Crack Sealant ASTM D5893
I.Polyurethane Crack Sealant ASTM C920
J.Mortar Sand Section 1003
K.Tap-Con Sc rews Engineer Approval
628.3Construction.
628.3.1 Submittals.
A.Submit the contractor qualifications for each of the respective repair and rehabilitation operations
verifying successful completion of at least 3 separate repair or rehabilitation projects within the last 5-years using the proposed manufactured products . The engineer may accept a manufacturer’s letter of certification for an approved installer. Ensure that qualifying personnel oversee repair and rehabilitation operations.
B.Submit details of the methods and materials needed to attain sufficient early strength that will
allow opening the roadway to traffic in a timely manner when contract time constraints do not allow the cure times specified in Section 610.
C.Submit equipment used in all aspects of concrete repair and rehabilitation operations.
D.Submit formal meeting minutes from a pre -construction meeting held 14 calendar days before the
start of work to brief the personnel performing the work and the engineer on the operations. Submit a concrete repair work plan to document the proposed repair means and methods discussed during the preconstruction meeting. 628.3.2 Crack Repairs.
A.Structural Repair .
1.Limitations.
a.Crack widths of 0.002 -inch to 0.25 -inch.
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 344–348 of 779.