PAVEMENT
510.01 Description. This item shall consist of grinding portland
cement concrete pavement to substantially eliminate vertical differentials and to restore drainage, riding chara cteristics, and skid resistance to the pavement surface.
510.02 Equipment. The grinding equipment shall be a power
driven, self-propelled machine that is specifically designed to smooth and texture portland cement concrete pavemen t. The equipment shall be capable of grinding the surf ace without causing spalls at cracks, joints, or at other locat ions.
510.03 Construction Requirements. The pavement will be
initially profiled by the Contractor using an autom ated lightweight profilometer complying with ASTM E 950, Class 1 and calibrated to the California-style profilograph scale. The initi al profilograph will be used to locate high and low areas for correction . Areas representing high points having deviations in excess of 0.3 ″ (7.5 mm) in 25 ′ (7.5 m) as determined by the profilograph or 1/8 ″ (3 mm) in 10 ′ (3 m) as determined by the straightedge, shall be 380 reduced by grinding until such deviations as indica ted by retest do not exceed the above limits. Areas showing low spots of more than ¼ ″ (6 mm) in 10 ′ (3 m) in the longitudinal direction shall be corrected by gr inding the adjacent higher pavement to an elevation that will not show surface deviations in excess of 1/8 ″ (3 mm) in 10 ′ (3 m). The construction operation shall produce a uniform finished surface without damaging the existing pavement that is to remain. Grinding shall be accomplished in a manner that eli minates joint or crack faults while providing positive lateral drain age by maintaining a constant cross-slope. Grinding shall transition as required to provide positive drainage and an acceptable riding surface. The pavement shall be ground in a direction opposite to normal traffic flow. The entire area designated on the plans shall be gr ound until the pavement surfaces of adjacent sides of transverse j oints and cracks are in the same plane. It is intended that the fau lting at joints and cracks be eliminated and that substantially all of the pavement surface shown on the plans be textured. Extra dept h grinding to eliminate minor depressions in order to provide tex turing for 100% of the pavement surface will not be required. The Contractor shall establish positive means for r emoval of grinding residue. Solid residue including joint ma terial shall be immediately removed from the pavement surface. Res idue shall not be permitted to flow across lanes used by traffic. Drainage facilities shall be kept free of accumulated residue.
510.04 Final Surface Finish. The grinding process shall
produce a pavement surface that is true to grade an d uniform in appearance with a longitudinal line type texture. The line type texture shall contain parallel longitudinal corruga tions that present a narrow ridge corduroy type appearance. The peaks o f the ridges shall be approximately 1/32" (0.8 mm) higher than t he bottoms of the grooves with approximately 53 to 57 evenly spac ed grooves per foot (170 to 190 evenly spaced grooves per meter). The finished pavement surface will be measured for roughness by the Contractor. Roughness will be measured using a n automated lightweight profilometer complying with ASTM E 950, Class 1 and calibrated to the International Roughness Indicator (IRI) scale. The IRI shall not exceed 100 inches per mile per 0.5 mi le section (1.60m per km per 0.8 km section). Bridges or any other n on-ground sections will not be included in the calculation of the IRI. 381 The Engineer will verify the roughness indices by t esting approximately 10% of the pavement. This testing wi ll be performed by the Engineer, using either the lightweight profi lometer furnished by the Contractor or one provided by the Department , at the option of the Engineer. Vertical misalignment of the planes of the surfaces on adjacent sides of the joints or cracks that is in excess of 1/16" (2 mm) shall be ground until the surfaces are flush. The transverse slope of the pavement shall be unifo rm to a degree that no depressions or misalignment of slope greate r than 1/4" (6 mm) in 10' (3 m) are present when tested with a straightedge placed perpendicular to the centerline.
510.05 Method of Measurement. Grinding Portland Cement
Concrete Pavement will be measured by the square ya rd (square meter).
510.06 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for at the contract unit price bid per square yard (square meter) for Grindi ng Portland Cement Concrete Pavement, which price shall be full compensation for furnishing equipment; for grinding the existing concrete pavement; for removing residue and cleaning the pav ement; for furnishing and operating the automated lightweight profilometer, for measuring the surface profile indices and the IRI; and for all labor, equipment, tools, and incidentals necessary to comp lete the work. Payment will be made under: Pay Item Pay Unit Grinding Portland Cement Square Yard Concrete Pavement (Square Meter)
GRINDING PORTLAND CEMENT CONCRETE in other states
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