528.1 General Description
This work consists of labor, material, equipment, and services necessary for repairing concrete cracks. The plans will specify or the Engineer will determine the extent of repair. The work shall comply with the specifications including Special Provisions where applicable.
528.1.01 Definitions
General Provisions 101 through 150.
528.1.02 Related References
A. Standard Specifications Section 886—Epoxy Resin Adhesives B. Referenced Documents General Provisions 101 through 150.
528.1.03 Submittals
General Provisions 101 through 150.
528.2 Materials
Ensure epoxy used for crack repair complies with the requirements of Section 886, Type V epoxy adhesive. Ensure epoxy used for sealing cracks at the surface is strong enough to withstand injection pressures up to 250 psi (2 MPa).
528.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
528.3 Construction Requirements
528.3.01 Personnel
General Provisions 101 through 150.
528.3.02 Equipment
A. Injection Equipment Ensure that dispensing equipment for the injection complies with the following performance requirements: • Self-monitor pressures of 250 psi (2 MPa) for extended periods under flow. • Maintain a ratio of accuracy of one percent at the required pressures. • Mix in-line using a static mixing head. When using screen wire, wire brushes, or other elements for mixing, provide independent certification that the material is mixing thoroughly at the flow rate and temperatures for the job. Also demonstrate that the unit will not dispense resin if the material line is blocked on the supply or dispense side of the system.
528.3.03 Preparation
Before repairing the cracks specified on the Plans, prepare the concrete surfaces next to the cracks by exposing clean and sound concrete. The exact procedures for exposing clean and sound concrete shall be the Contractor’s option and responsibility. However, the procedures must comply with any traffic handling and construction sequencing requirements for the project.
528.3.04 Fabrication
General Provisions 101 through 150.
528.3.05 Construction
Seal concrete cracks as follows: 1. After preparing the concrete surfaces, seal the cracks at the surface with epoxy. Port spacing, location, and port type shall be the Contractor’s option and responsibility. 2. If the voids are not thoroughly penetrated, use the following procedure: a. Wet core on 8 in. (200 mm) centers the holes that are 1/2 in. (13 mm) diameter and 3/4 in (19 mm) to 1 in. (25 mm) depth. b. Insert into the cored holes to the full depth copper or plastic tubes 1/2 in. (13 mm) diameter and notched at the base. c. Seal the circumference of the ports at the surface. d. Inject the epoxy at a constant pressure not to exceed 250 psi (2 MPa) for at least 10 minutes or until penetration occurs. 3. After the injection operation is complete, clean the sealed cracks to the original concrete surface. 4. Remove nipple devices and surface sealers over the injection holes.
528.3.06 Quality Acceptance
General Provisions 101 through 150.
528.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
528.4 Measurement
No measurement for payment will be made for any material, equipment, or labor necessary to accomplish this Work.
528.4.01 Limits
General Provisions 101 through 150.
528.5 Payment
All costs for material, equipment, or labor shall be included in the Lump Sum price bid for Epoxy Pressure Injection of Concrete Cracks. Payment will be made under: Item No. 528 Epoxy Pressure Injection of Concrete Cracks, Bridge No.___ Per lump sum
528.5.01 Adjustments
General Provisions 101 through 150.
Get an email when 528 changes
Georgia revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.