509NEXT GENERATION CONCRETE SURFACE

509.1DESCRIPTION—This work is the Next Generation Concrete Surface (NGCS) texture utilizing

diamond grinding and grooving on new or existing cement concrete pavement as indicated or directed.

509.3CONSTRUCTION—

and grooving the concrete pavement. The grinding equipment must weigh a minimum of 40,000 pounds when equipped with a grinding head capable of making a single pass, a minimum of 4 feet in width. Do not use grinding equipment that causes spalls at joints or cracks, or fractures surface aggregates.

determined by the capability of the contractor’s equipment . Texture the entire pavement surface in the longitudinal direction parallel to the pavement centerline . Grinding is to be performed in a manner that eliminates faults at joints and cracks so there is a maximum 1/16-inch differential between adjacent sides of joints and cracks. Perform a feather pass to ensure proper pavement drainage on the adjacent shoulders and ramps to maintain a consistent cross slope. Maintain the existing cross slope of the roadway. No depressions or misalignment of slope greater than 1/8 inch in 12-feet, when measured with a 12-foot straightedge placed perpendicular to the centerline will be allowed . N on-compliant areas will be reground. Straightedge requirements will not apply across longitudinal joints. Provide proper drainage of the roadway, by making a feather pass a minimum of 2 feet into the adjacent shoulder, gore area, auxiliary lane, or ramp lane, using conventional diamond grinding. The minimum length of a feather pass will be 100 feet.

• Single-pass operation. Provide a flush ground surface that contains longitudinal grooves constructed in one, single-pass. Stack the diamond blade with two types of diamond grinding blades arranged to provide a ground surface along with blades that produce longitudinal grooves. The diamond blade stack for texturing must be mounted on a minimum 4-foot-wide grinding head, stacked with 1/8-inch blades separated by 1/32 inch spacers. If mounted on the grinding head, all blades used to produce the ground surface will be flat across the contact surface and in the same plane with other flush grinding blades, excluding the grooving blades. Use a 4-foot straightedge to verify all blades on the grinding head are straight across the contact surface with no bowing if installed to grinding equipment.

The blades used to create the longitudinal grooves should be 1/4 inch to 3/8 inch taller in diameter than the grinding blades. The longitudinal grooves should be spaced among the grinding blades approximately 1/2 inch center to center and must produce grooves 1/8 inch to 3/16 inch in depth.

The grinding equipment will be equi pped with a guide to ensure NGCS is parallel to the roadway centerline. No unground surface area is allowed between passes. Do not overlap any pass of the grinding/grooving head by more than 1 inch.

• Two-pass operation. Provide a flush ground surface that contains longitudinal grooves constructed in two operations. The first operation will grind the pavement surface using a diamond blade stack mounted on a minimum 4-foot-wide grinding head, stacked with 1/8-inch blades separated by 1/32- inch spacers. If mounted on the grinding head, all blades used to produce the ground surface will be flat across the contact surface and in the same plane with other flush grinding blades . Use a 4-foot straightedge to verify all blades on the grinding head are straight across with no bowing if installed to grinding equipment.

The second operation will provide the longitudinal grooves. The longitudinal grooves must be 1/8 inch wide and 1/8 inch to 3/16 inch deep. The longitudinal grooves will be spaced approximately 1/2-inch center to center.

The grinding equipment will be equipped with a guide to ensure NGCS is parallel to the roadway centerline. No unground surface area is allowed between passes. Do not overlap any pass of the grinding/grooving head by more than 1 inch.

Remove slurry or residue resulting from the diamond grinding and grooving in a continuous operation. Do not allow slurry to flow across lanes occupied by traffic or to flow into gutters or other drainage facilities. Clean the pavement surface after diamond grinding and before opening to traffic.

and procedures will provide an acceptable surface. Do not proceed until the test section has been approved. The test section may be waived if approved in writing by the District Executive.

grooved texture. The ground surface must be smooth and contain no ridges that exceed 1/8 inch. A minimum 98% of the pavement surface must be textured utilizing NGCS. Depressed pavement areas due to subsidence, edge slump, or other localized causes will be excluded from this requirement if approved.

pavement as specified in Section 507.3(a) and Section 507.3(b). Provide a maximum IRI of 70 in/mile for facilities if posted speed limits are greater than 45 miles per hour, and a maximum IRI of 90 in/mile for facilities if posted speed limits are less than or equal to 45 miles per hour. To receive payment, all IRI lots must meet the requirements for the posted speed limits.

beginning ride quality limit and continuing to the ending ride quality limit for each pavement lane and ramp that is 12 feet or wider. Do not include the length of excluded areas in the 528 feet. Excluded areas will consist of; bridge decks, ramps less tha n 1,500 feet in length, tapered pavements less than 12 feet wide, partial lots less than 100 feet in length, shoulders, medians, and other pavement surfaces as indicated.

509.4MEASUREMENT AND PAYMENT—Square Yard

Payment will be for the entire textured surface completed as part of this work , whether the work is performed in a single-pass operation or a two-pass operation.

No ride quality incentive will be paid for NGCS texturing on concrete rehabilitation projects.