Article 1 — Description
Repair damaged concrete beams. Beam damage may include delamination, surface spalling, section loss, reinforcement damage, and cracking.
Article 2 — Work Methods
Provide materials and perform work in accordance with the Department’s Concrete Repair Manual , as shown on the plans, and in accordance with the following : Item 429, “Concrete Structure Repair,” for repairing unsound, delaminated, or spalled concrete; Item 780, “Concrete Crack Repair,” for sealing concrete cracks with pressure- injected, gravity -fed, or surface- applied epoxy; and Item 786, “Carbon Fiber Reinforced Polymer (CFRP),” for confining or strengthening concrete using a CFRP syste m. Provide strand and hardware meeting the requirements of Item 424, “Precast Concrete Structural Members (Fabrication),” if strand splicing and re- tensioning are required. Follow work methods as shown on the plans. Pre-load the damaged beam before repair work if shown on the plans. Pre- load by loaded 10-cu. yd. dump truck or other approved method. Keep the pre-load in place until repair concrete has attained a minimum compressive strength of 3,600 psi. Remove damaged bridge protective assembly as directed. Replace assembly if required in accordance with Item 441, “Steel Structures.” The Engineer will test the quality of the repair work by hammer blows, bond strength test, and any other means necessary to ensure satisfactory performance. Rework or replace defective or debonded work at the Contractor’s expense. Apply supplemental CFRP strengthening or protection as shown on the plans.
Article 3 — Measurement
This Item will be measured by each beam repaired.
Article 4 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit bid price for “Concrete Beam Repair,” “Concrete Beam Repair plus Strand Splicing,” “Concrete Beam Repair plus CFRP,” and “Concrete Beam Repair plus Strand Splicing and CFRP.” This price is full compensation for repair; supplemental exterior confinement or strengthening; and furnishing equipment, labor, materials, tools, and incidentals.