Home / DOT Specifications / Delaware / Standard Specifications for Road & Bridge Construction / 62600

Electrical (16000-16999)

626000 STEEL PEDESTRIAN RAILING LF

DE · 2025 Standard SpecificationsBook pages 348–350View official source ↗

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.

CONCRETE REPAIR AND REHABILITATION SECTION 628 339 b. Any surface orientation, including inverted surfaces.

2.Repair Method: Use epoxy injection in accordance with the following:

a.Personnel requirements.

i.Individual performing epoxy injection repairs must be trained by the epoxy injection system

manufacturer to install and operate pressure injection equipment or ii. the epoxy injection repairs must be overseen in person by the epoxy injection system manufacturer’s technical representative.

b.Perform epoxy injection according to the process listed below or manufacturer

recommendations. If the methods conflict between these specifications follow the manufacturer recommendations.

i.Install injection ports or tees spaced 6 -inches to 12 -inches apart for vertical repairs and 6

inches to 18 -inches apart for horizontal repairs. ii. Do not set ports or tees closer together than the thickness of the concrete member if full - depth penetration is required. iii. Select the depth and spacing of holes for the ports or tees to ensure no further damage occurs to the member under repair and that is appropriate to the flow characteristics and injection pressure of the epoxy for crack widths and depths present. iv. Set ports or tees in dust -free holes made with vacuum drills or chipping hammers.

v.After anchoring the ports or tees in the hole with epoxy binder, seal the crack surface with

epoxy binder between the ports or tees to ensure retention of the pressure injected epoxy within the confines of the member. vi. Apply epoxy binder to clean dry surfaces and substrate at temperatures no less than 50 degrees F. vii. After the injected epoxy has hardened, grind ports or tees flush with the concrete surface. Finish the repaired area to match the existing concrete surface.

B.Sealing Repair :

1.Repair Methods and Limitations.

Sealing repair method and material required to use the following table to determine sealing repair and material: Table 628.3 -1. Sealing Repair Methods and Material Requirements. Material Crack Surface Orientation Crack Width Structure Type Application Method Low Viscosity Epoxy or High Molecular Weight Methacrylate Horizontal Maximum 8% slope 0.002” – 0.25” All Poured Gravity Fed Polyurethane or Silicone Horizontal Sloped Vertical 0.125” – 1” All Gun or Trowel CONCRETE REPAIR AND REHABILITATION SECTION 628 340 Inverted

Non -Shrink Grout Horizontal Sloped Vertical ≥ 1” All Trowel

2.Low Viscosity Epoxy or High Molecular Weight Methacrylate

a.Remove surface contaminants by blowing out the crack with oil -free compressed air.

b.Prepare the surface and damming material per manufacturer recommendation. Take

measures to prevent sealing material leakage when a crack has propagated to a non - horizontal surface.

c.Perform repairs when surface and ambient temperatures are within the manufacturer

recommended ranges.

d.Mix material components in accordance with the manufacturer’s recommendations.

e.Apply sealing material in accordance with the manufacturer’s recommendations.

f.Cover surface areas where excessive sealing material remains with a light broadcast of dry

mortar sand that complies with Section 1003 at the time recommended by the manufacturer. Use a quantity of sand necessary to absorb the excess sealing material.

g.Following all manufacturer curing methods and recommendations prior to opening to traffic.

3.Polyurethane or Silicone

a.Seal cracks in horizontal surfaces with self -leveling sealant. Seal all other surfaces with non -sag

sealer.

b.Rout cracks by grinding to create a V -shaped groove with the crack centered in the groove.

Routed grooves must be a maximum 1/2 -inch depth.

c.Remove contaminants by blowing out crack with oil -free compressed air.

d.Ensure the ambient and surface temperatures are within the manufacturer’s recommended

placement range before applying the sealant.

e.If required, apply primer as recommended by the manufacturer.

f.Apply sealant in accordance with manufacturer's recommendations to form a smooth surface.

g.Cure sealant in accordance with the manufacturer’s recommendations. Curing must be

completed prior to opening to traffic.

4.Non -Shrink Grout.

a.Tool the crack to create a dovetail slot that is a minimum 1 -inch depth with a base and at least

1/4-inch greater than the crack width

b.Remove contaminants from the tooled crack by blowing the crack out with the oil -free

compressed air or by pressure washing.

c.Ensure that the ambient and surface temperatures conform to the manufacturer’s

recommendation during grout mixing, placement, and curing.

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 348–350 of 779.

← Previous

62500 0 PROVIDING POLYESTER POLYMER CONCRETE OVERLAY CY

340 Inverted