CATEGORY 500 PAVING SECTION 525 — PORTLAND CEMENT CONCRETE SPALL REPAIR
525.01 Description
Repair spalled areas at various locations as specified in the Contract Documents or as directed. Spalling consists of small areas of cracking, breaking, chipping, or fraying of Portland Cement Concrete (PCC) slabs that typically occur within 2 ft of the edge of joints. Some spalling may occur in the middle of the slab away from the joints.
525.02 Materials
Rapid Hardening Cementitious Materials for Concrete Pavement Repair Portland Cement Concrete Mix #9 using No 7 aggregate Epoxy Adhesive 902.14 902.10 921.04
525.03 Construction
Repair spalled areas according to the following.
525.03.01 Repair Guidelines.
a.Rapid Hardening Cementitious material or Portland Cement Concrete Mix #9 using No. 7 aggregate may be used in spalled areas that are less than 4 ft2 and less than 3 in. deep.
b.Use Portland Cement Concrete Mix #9 using No. 7 aggregate only in spalled areas are 4 ft2 or greater or when the known depth is 3 in. deep or more. Rapid-hardening cementitious materials with extender aggregate may be used instead of Mix #9.
c.The maximum repair width shall not be greater than one-third of the travel lane. (d) Repair areas greater in width than one-third of the travel lane, deeper than one-third of the slab thickness, or where reinforcing steel is exposed as a Type I or Type II full- depth patch as specified in Section 522. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
525.03.02 Repair Procedure. Refer to Section 522 and the following.
a.Sound the area around the spalling with a light hammer to locate the extent of the repair. Mark the perimeter 3 in. beyond the delamination marks.
b.Do not make repairs on spalls less than 6 in. long and less than 1.5 in. wide.
c.Combine any two spalled areas less than 2 ft apart into one area of repair. (d) Make a vertical saw cut along the outside perimeter of the repair area using a diamond- bladed saw set to a depth of approximately 2 in.
e.Use a chipping hammer fitted with a spade bit having a maximum weight of 30 lbs. to remove the unsound concrete until sound and clean concrete is exposed along the entire bottom of the repair area. Expose the area to a depth of no more than 1/3 of the slab thickness. When more chipping is required, or when any reinforcing steel is exposed, repair the area as specified in Section 522.
f.Removal of spalled or delaminated concrete may be performed by carbide milling rather than sawing and chipping to a depth of no more than 1/3 of the slab thickness. When any reinforcing steel is exposed, repair the area as specified in Section 522.
g.Sound the bottom of the repair area with a light hammer to locate any remaining weak spots.
h.Clean the repair area thoroughly of all loose and foreign material.
i.Coat the repair area with an epoxy bonding compound according to C881 Type V. (j) Place the repair material in one continuous operation. Consolidate the concrete using spud vibrators or as recommended by the manufacturer. Finish the repair as specified in 522.03. Trowel the repair outward to push the repair material against the walls of the repair.
k.Cure the repair as specified in 522.03.11.
525.04 Measurement and Payment
Portland Cement Concrete Spall Repair will be measured and paid for at the Contract unit price per cubic yard for the pertinent Portland cement concrete pavement item. The payment will be full compensation for all saw cutting, carbide milling, chipping, concrete, rapid hardening cementitious materials, epoxy bonding compound, cleanup of the patched areas, forms, reinforcement steel, chairs, epoxy coating, finishing, curing, joints, joint construction, joint saw cutting, joint sealing, tack coat, all hauling of materials, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 528 — RESURFACING ASPHALT PAVEMENT USING PORTLAND CEMENT CONCRETE CATEGORY 500 PAVING SECTION 528 — RESURFACING ASPHALT PAVEMENT USING PORTLAND CEMENT CONCRETE
528.01 Description
Resurface existing asphalt pavements with a Portland Cement Concrete (PCC) surface. The location and extent of the resurfacing will be as specified and as directed.
528.01.01 Whitetop Patching (WT Patching). Removal of deteriorated remaining pavement, stone base, or soil after milling and replacing with
concrete.
528.02 Materials
Aggregates 901.01 Concrete Admixtures 902.06 Portland Cement Concrete Whitetopping Mix 902.10 Mix No. WT Rapid Hardening Cementitious Materials for Concrete Pavement Repairs 902.14 Synthetic Fibers 902.15 Joints Section 911 Portland Cement Concrete Plants 915.03
528.03 Construction
Submit the proposed paving plan at least 30 days prior to beginning the work. The plan shall include equipment, milling plan, proposed material sources, and placement methods. Ensure pavement surfaces are protected from all damage. Mix, place, and finish the concrete when natural light is sufficient, or provide adequate artificial lighting as approved.
528.03.01 Pre-pave meeting. Conduct a pre-paving meeting at least three weeks prior to
beginning the work. The meeting shall consist of the following personnel: Contractor, concrete supplier, paving sub-contractor (project manager and onsite foreman/supervisor), traffic control personnel, Project Engineer, lab personnel, and OMT Design Engineer. Provide the meeting minutes to all attendees. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 712–713 of 1,113.