509 GRINDING ASPHALT PAVEMENT

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509.01 DESCRIPTION.
Grind asphalt mix pavement.
509.02 MATERIALS.
Performance Graded Asphalt Binders and Asphalt Mixes       904
509.03 CONSTRUCTION.
Refer to Section 505. Perform roadway grinding as specified. Additional patching may be required after grinding.
509.03.01 EquipmentAll machinery, tools, and apparatus necessary for the proper construction and acceptable completion of the work, together with the necessary supplies for upkeep and maintenance.. Use grinding equipment designed specifically for grinding asphalt surfaces that has a cutting mandrel with carbide tipped cutting teeth. The equipment shall accurately establish slope elevations and profile grades.
Provide a vacuum equipped sweeper to follow immediately behind the grinder. The sweeper shall be capable of removing all loose material from the roadway without causing dust to escape into the atmosphere.
509.03.02 Control Strip. Grind a control strip at least 500 ft in length with a uniformly textured surface and cross section as approved. Provide a final pavement surface with a transverse pattern of 0.2 in. center to center of each strike area and with the difference between the high and low of the matted surface not exceeding 1/16 in.
509.03.03 Pavement Grinding. Use the same procedures, settings, speed, and requirements as used for the control strip. Maintain an adequate cross slope for drainage by grinding the lane or shoulder adjacent to the grinded pavement when necessary. Grinding will not be required on bridge decks.
(a) Grind one lane at a time.
(b) Grind the abutting lane or shoulder on roadways carrying traffic on the same day if the grinding depth exceeds 2-1/2 in.
(c) Grind the abutting lane or shoulder prior to weekends or temporary shutdowns, regardless of depth.
(d) The abutting lane or shoulder may be grinded on alternate days if the grinding depth is 2-1/2 in. or less.
(e) Provide adequate advance warning devices as specified where uneven pavement joints exist.
(f) Furnish an approved 10 ft straightedge for testing the transverse and longitudinal surface after grinding.
(g) Correct all areas showing high spots greater than 1/8 in. within 10 ft at no additional cost.
(h) Straightedge requirements apply to areas across joints and repaired cracks but are not applicable to areas outside the grinded area.
Fill all depressions, potholes, and other irregularities using an asphalt mix after the grinding is complete. Construct an asphalt wedge at existing water valves, meters, manhole covers, etc.
509.03.04 Temporary Tie-ins.
(a) Construct a temporary tie-in at least 4 ft in length for each 1 in. of pavement depth when paving roadways carrying traffic with a posted speed ≤ 40 mph.
(b) Construct a temporary tie-in at least 10 ft in length for each 1 in. of pavement depth when paving roadways carrying traffic with a posted speed >40 mph.
(c) Construct temporary tie-ins before allowing traffic to cross the transverse joint.
(d) Construct temporary tie-ins of 10 ft or greater using a paver meeting 504.03.01.
Use a vacuum equipped street sweeper, in addition to any other equipment required, to remove dust and debris after milling and prior to returning the area to traffic.
Fill all depressions, potholes, and other irregularities with an asphalt mix after milling. Construct an asphalt wedge at existing water valves, meters, manhole covers, etc.
509.04 MEASUREMENT AND PAYMENT.
Grinding Asphalt Pavement will be measured and paid for at the pertinent Contract unit price per square yard. The square yardage will be computed from the actual width and length measurements of the area that has been grinded.. The payment will be full compensation for grinding, removal and disposal of grinded material, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
509.04.01 Asphalt mix for filling depressions and potholes, and for wedging manholes, valve boxes, inlets, or other structures will be measured and paid for per 106.04.
509.04.02 Asphalt patches will be measured and paid for per 505.04.


SPECIAL PROVISION INSERTS

The following Special Provision Inserts update Section 509 after the official publication of the Standard SpecificationA written description of functional characteristics, or the nature of a construction item to be procured. It may include a. Updated documents may be found within the Standard and Supplemental Specifications for Construction and Materials on the MDOTMaryland Department of Transportation SHA web page.

SPI-Section 509-Diamond Grinding. Dated 12/20/2017.