CONCRETE REPAIR AND REHABILITATION SECTION 628 344 the patch to make a 1/2 -inch minimum depth vertical face from the top of the adjacent riding surface.
5.When the removal depth of an existing concrete deck spanning over a roadway, waterway, or
railroad reaches 1/2 of the existing concrete deck thickness, and deeper removal is anticipated, provide and erect temporary protective shielding under the deck to prevent falling material from reaching the roadway, waterway, or railroad area below.
6.Refer to Section 628. 3.4.D.5 for further guidance on cleaning, repairing, or replacing existing
reinforcement.
7.After completely removing deteriorated concrete, clean the concrete surface in accordance with
8.Patch spalled concrete, voids, and other defects as follows:
a.The Department will not require any special treatment for cavities less than 1/2 -inch deep on
milled surfaces. Fill with the concrete overlay material.
b.For cavities 1 1/2 -inches or less deep on riding surfaces, fill the space with epoxy grout.
c.For cavities 1 1/2 -inches or more in depth, fill with Class D concrete.
d.When the deck will receive an overlay, shot or grit -blast the patch surfaces repaired to assure
proper bonding with the overlay. For riding surface repairs using Class D concrete, apply a broom or hand -tine finish. For riding surface repairs using epoxy grout, cover the area with a light broadcast of dry mortar sand meeting the requirements of Section 1003 before the epoxy grout hardens.
B.Cure premixed packaged materials in accordance with manufacturers recommendations. Cure
ready mix PCC materials in accordance with Section 610.3.6.B.1.b. 628.3 .6. Drilling holes and placing dowels.
A.Drill holes at the locations and to the minimum depth shown in the contract. Drill hole diameters
in accordance with the epoxy grout manufacturer's recommendations for the dowel sizes, or as shown in the contract. Grout the anchor bolts or dowels in place using the epoxy grout in accordance with manufacturer's recommendations. Repair damage caused by the drilling operations to the engineer’s satisfaction.
628.4Method of Measurement.
A.The Department will measure the quantity of:
1.Epoxy injection as the number of linear feet of cracks injected and accepted.
2.Grouting and sealing cracks as the number of linear feet of cracks routed, sealed, and accepted.
3.Grout as the number of cubic feet of grout placed and accepted;
4.Shallow and deep spall repair as the number of cubic feet repaired, placed and accepted.
5.Rehabilitation of existing PCC as the number of cubic yards of concrete removed and repaired.
6.Concrete deck repair as the number of square feet of repairs made at the various depths,
complete in place and accepted.
7.Drilling holes and installing dowels as the number of each hole drilled, grouted, and accepted.
CONCRETE REPAIR AND REHABILITATION SECTION 628 345 B. The Department will measure dowels and anchor bolts under separate items.
628.5Basis of Payment.
A.The Department will pay for accepted quantities at the contract unit price.
B.Price and payment for epoxy injection constitute full compensation for providing all materials,
surface preparation, application, cleaning the areas of spills and other contaminates, and abrading the concrete surface areas.
C.Price and payment for routing and sealing cracks constitute full compensation for providing and
placing all materials, crack routing, and surplus material removal.
D.Price and payment for repair of existing grout constitute full compensation for providing and
placing all materials, removal and disposal of deteriorated grout, and surface preparation.
E.Price and payment for spall repair, PCC masonry rehabilitation , and concrete deck repair
constitute full compensation for:
1.Providing and placing all materials;
2.Providing and erecting temporary protective structure;
3.reinforcement bar cleaning;
4.existing reinforcement bars splicing or replacement;
5.deteriorated concrete removal and disposal; and
6.surface preparation.
F.Price and payment for drilling holes and installing dowels constitute full compensation for
providing and placing all materials.
G.The Department will pay for:
1.Concrete overlays under Section 625;
2.concrete sealing with methacrylate under Section 613;
3.concrete or hot mix milling under Section 760; and
4.dowels and anchor bolts under separate items
ITEM DESCRIPTION UNIT 628001 REPAIR OF CONCRETE STRUCTURES BY EPOXY INJECTION LF 628010 CRACK SEALING BRIDGE DECKS, APPROACH SLABS, SIDEWALKS, ETC SF 628011 CRACK SEALING BRIDGE DECKS, APPROACH SLABS, SIDEWALKS, ETC LF 628020 ROUT AND SEAL CRACKS LF 628030 REPAIR OF EXISTING GROUT CF 628040 SHALLOW SPALL REPAIR CF 628041 DEEP SPALL REPAIR CF 62804 2 REHABILITATION OF PCC MASONRY CY 628050 DECK REPAIR, 1/2" TO 1" DEPTH SF
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 354–355 of 779.