2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 500 PAVING SECTION 509 — DIAMOND GRINDING
509.01 Description
Grind Portland cement concrete or asphalt pavement with diamond tipped saw blades to restore proper drainage and ride quality.
509.02 Materials
Not applicable.
509.03 Construction
Prepare and submit a traffic control plan for approval as specified in 104.01. Patch the pavement as specified and remove all pavement markings prior to grinding. Seal joints after grinding as specified.
509.03.01 Equipment. Use a power-driven, self-propelled machine capable of grinding the
pavement surface to the specified smoothness and texture using diamond tipped saw blades. Do not use equipment that damages the underlying pavement, causes raveling, aggregate fractures, or spalls at joints or cracks. The grinding unit shall:
a.Weigh at least 35 000 lb, including the grinding head.
b.Have a grinding head that will grind a strip at least three feet wide.
c.Have a wheelbase of at least 12 ft.
d.Have a vacuum system that removes all grinding slurry from the pavement surface and leaves the surface in a clean, near-dry condition.
e.Be maintained to ensure it is in proper working order with attention paid to the roundness of the match and depth control wheels. Replace any wheels found to be out of round.
509.03.02 Grinding. Grind the pavement in the longitudinal direction, beginning and ending at lines
normal to the pavement centerline.
a.Do allow any unground surface area between passes, and do not overlap passes of the grinding head more than 2 inches. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
b.Eliminate faults to result in a maximum of 1/16 in. differential between adjacent sides of joints or cracks, except that under no circumstances shall the maximum overall grinding depth exceed 1/2 in. Grind into adjacent lanes or shoulders as directed to transition from the edge of the travel lane to provide lateral surface drainage leaving no more than a 1/8 in. ridge and an acceptable riding surface.
509.03.03 Final Cross Slope. Achieve lateral drainage by maintaining a constant cross slope
between grinding extremities in each lane. Have an approved 10 ft straightedge available at all times. The finished surface shall be sufficiently smooth so that when tested with a straightedge placed upon the surface parallel with the center line, the surface does not deviate more than 1/8 in. The transverse slope of the finished surface shall not deviate more than 1/8 in. Straightedge requirements do not apply across longitudinal joints or outside the ground area. Regrind areas of deviation as directed.
509.03.04 Final Finished Surface. Produce a neat, uniform finished surface with a longitudinal line-
type texture with corrugations parallel to the outside pavement edge. The peaks of the ridges shall be 1/16 in. ± 1/16 in. higher than the bottom of the grooves with evenly spaced ridges having a land area width ranging from 0.080 in. to 0.110 in. It may be necessary to adjust the blade spacing to achieve the specified texture. Ensure a minimum of 95 percent of any 100 ft section of pavement surface is textured.
509.03.05 Slurry Handling and Removal. Continuously remove the grinding slurry residue from
the pavement. Do not allow the slurry to flow across lanes occupied by traffic or to flow into gutters or other drainage facilities. Collect the slurry into water-tight haul units and transport and properly dispose of all slurry and residues from the pavement surface off-site.
509.03.06 Pavement Surface Profile. Refer to Section 535.
509.04 Measurement and Payment
Diamond Grinding will be measured and paid for at the Contract unit price per square yard. The payment will be full compensation for grinding, cleaning the pavement and shoulders, slurry removal and disposal, surface profile testing, corrective action, technicians, and for all material, labor, equipment, and incidentals necessary to complete the work. Traffic control will be measured and paid for under separate pay items for this project. Traffic control will include all devices and requirements as stated in the traffic control plan. 510 — SEALING CRACKS AND JOINTS IN ASPHALT PAVEMENTS CATEGORY 500 PAVING SECTION 510 — SEALING CRACKS AND JOINTS IN ASPHALT PAVEMENTS
510.01 Description
Clean and seal cracks with a width between a minimum of 1/8 in. and a maximum of 1 in. Use asphalt repair mastic for cracks equal to or greater than 1 in. Cracks less than 1/8 in. wide do not need to be sealed. Repair distressed areas as specified, unless otherwise directed.
510.02 Materials
Crack Sealer 911.01 Asphalt Repair Mastic 911.01.02
510.03 Construction
510.03.01 Equipment. All equipment shall be subject to approval. Ensure all equipment is
maintained in satisfactory working condition at all times.
a.Air Compressor. Air compressors shall be portable and capable of furnishing a minimum of 100 cubic feet of air per minute (cfm) and a minimum blast flow of 150 cfm. The compressor shall have a maximum of a 3/4 in. (20mm) diameter nozzle and shall be equipped with oil-free compressed air.
b.Hot Air Lance. The compressed air Hot Air Lance shall produce a minimum temperature of 750 F (400 C) at a minimum velocity of 650 ft/s. The compressed air must be produced from an air-compressor capable of producing a minimum of 125 cfm (0.06 m3/s) of clean, oil-free compressed air. The Hot Air Lance shall be designed such that the flame does not come in contact with the pavement.
c.Melting Kettle. The Melting Kettle shall be a self-contained double boiler that is capable of heating the sealant using oil as a heat transfer medium. The kettle shall be equipped with an automatic heat-control unit set capable of achieving a predetermined sealant temperature and maintain that temperature as long as required. The kettle shall be capable of safely heating the material to 400 F. The temperature control unit should not allow the heat transfer oil to exceed 525 F. The unit shall be capable of reading the temperature of the sealant within the melting vessel and within the discharge plumbing to provide monitoring and reporting of the sealant throughout the operation. The kettle 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 670–671 of 1,113.