502— Full Depth Concrete Pavement Patching

500-29 Section 502 — Full Depth Concrete Pavement Patching

502.1 Description 1 Construct full depth patches of Portland cement concrete pavement. 502.2 Materials 502.2.1 General 1 Use materials that meet the requirements of Sections 305, 501, 701, and 703. 502.2.2 Portland Cement Concrete 1 Use Portland cement Type I , Type III, or Type 1L from an approved source listed on Qualified Products List 6. Ensure that the minimum cement content for patching concrete is 800 lb/cu yd or more. Use a water -cementitious material ratio less than or equal to 0.38. Maintain the water -cementitious material ratio using normal or high range water reducing materials Type F or G from an approved source listed on Qualified Products List 5. Use non- chloride accelerators to achieve compressive strength and time of set desired. Use coarse aggregates meeting the gradation of Aggregate No. 56, 57, or 67. Provide an air content of 3.0 % to 6.0 % when tested according to AASHTO T 152. 2 Submit mix designs to the SME according to Subsection 701.2.12 , except as modified by the mix requirements of this Section. Review of the mix design by the Department in no way relieves the Contractor of this responsibility. 3 Provide concrete for patching that develops sufficient strength, as determined by the Contractor, so that the patch may be opened to traffic within 6 hours of placement. Replace any patch that develops cracking or deformation within 45 days after opening to traffic at no additional cost to the Department . 502.2.3 Reinforcing Steel 1 Provide tie bars and dowel bars as specified in the patching detail that conform to Subsection 501.2.1.2. 502.2.4 Epoxy System 1 When an epoxy system is required to anchor dowel bars and tie bars, use a product that meets ASTM C881, Type 4, Grade 3, Class B or Class C. Provide the RCE with a certification from the manufacturer for each lot number received at the job site. If requested by the RCE , verify that the proposed epoxy system provides adequate pullout resistance by demonstrating the epoxy with a No. 4 tie bar in a scrap section of pavement slab. Provide the equipment to test the