424SUPERPAVE BITUMINOUS CONCRETE BASE, BINDER, AND WEARING SURFACE LAYERS

242

50 60 70 80 90 100 PERCENT PASSING GRADATION CHART FOR 3/4 inch {19 mm} MAXIMUM SIZE AGGREGATE Maximum Density Line 75 150 300 600 1.18um 2.36 4.75 9.5mm 12.5 19.0 25.0 37.5 500 Maximum Control Points Minimum Control Points 0 200 100 50 30 16 8 4 3/8 1/2 3/4 1 1 1/2 2No. In. Sieve Size to the 0.45 Power 50 60 70 80 90 100 PERCENT PASSING GRADATION CHART FOR 1/2 inch {12.5 mm} MAXIMUM SIZE AGGREGATE Maximum Density Line 75 150 300 600 1.18um 2.36 4.75 9.5mm 12.5 19.0 25.0 37.5 500 Maximum Control Points Minimum Control Points 0 200 100 50 30 16 8 4 3/8 1/2 3/4 1 1 1/2 2No. In. Sieve Size to the 0.45 Power SUPERPAVE BITUMINOUS CONCRETE BASE, BINDER, AND WEARING SURFACE LAYERS 243

424.04Construction Requirements

The mixing temperature of the asphalt mixture shall not exceed 350 F {177 C}.

Construction requirements shall be as specified in Articles 410.03 through 410.07.

The construction requirements for base layers shall be as specified in Articles 410.03 through

410.07, except as follows:

The edges shall be trimmed immediately after final rolling, using an accurately aligned string or wire, to a tolerance of 2 inches {50 mm} outside the theoretical edge of the layer and to a slope not flatter than 1:1. Any edge distorted by rolling shall be promptly corrected.

Each time an asphalt content measurement is made (ALDOT-354 or AASHTO T 308), the amount of moisture in the mixture shall be determined, regardless of aggregate type, as specified in ALDOT-130 and reported on Form BMT-20. The moisture determination shall be used in computing the corrected asphalt content. Moisture samples shall be taken with the asphalt content samples from the loaded truck. Moisture in the mixture shall not exceed 0.20% by weight {mass}.

All mixtures furnished for use shall conform to the approved job mix formula (JMF) within the tolerances set in Article 410.02. Mixture gradations may be produced provided the gradations are within the tolerances.

424.05Method of Measurement

The accepted quantities of Superpave Bituminous Concrete Wearing Surface Layer, Superpave Bituminous Concrete Binder Layer, and Superpave Bituminous Concrete Base Layer will be measured as provided in Article 410.08, subject to any exceptions contained herein.

424.06Basis of Payment

Superpave Bituminous Concrete Wearing Surface Layer, Superpave Bituminous Concrete Binder Layer, and Superpave Bituminous Concrete Base Layer will be paid for at the contract unit price bid in accordance with Article 410.09, subject to any exceptions contained herein. 50 60 70 80 90 100 PERCENT PASSING GRADATION CHART FOR 3/8 inch {9.5 mm} MAXIMUM SIZE AGGREGATE Maximum Density Line 75 150 300 600 1.18um 2.36 4.75 9.5mm 12.5 19.0 25.0 37.5 500 Maximum Control Points Minimum Control Points 0 200 100 50 30 16 8 4 3/8 1/2 3/4 1 1 1/2 2No. In. Sieve Size to the 0.45 Power SCORING BITUMINOUS PAVEMENT SURFACE 244

424-A Superpave Bituminous Concrete Wearing Surface Layer, ** , *** Maximum Aggregate Size Mix, ESAL Range **** - per ton {metric ton} 424-B Superpave Bituminous Concrete * Binder Layer, ** , *** Maximum Aggregate Size Mix, ESAL Range **** - per ton {metric ton} 424-C Superpave Bituminous Concrete Base Layer, ** , *** Maximum Aggregate Size Mix, ESAL Range **** - per ton {metric ton} * Specify either “Upper” or “Lower”. ** Specify "Patching", "Leveling", "Widening", etc. only when required. *** Specify Maximum Aggregate Size: 3/8", 1/2", 3/4", 1", or 1.5" {9.5 mm, 12.5 mm, 19.0 mm, 25.0 mm, or 37.5 mm}. **** Specify “A/B”, “C/D”, or “E”. SCORING BITUMINOUS PAVEMENT SURFACE

428.01Description

This Section shall cover the work of scoring bituminous plant mix pavement surfaces at locations shown on the plans or directed by the Engineer. The scoring shall consist of cutting grooves, at regular intervals in the shoulder pavement surface.

428.02Materials

N/A

428.03Construction Requirements

It is intended that areas of the pavement surface designated by the plans or by the Engineer to be scored shall be so done as to produce a rumble strip effect to alert inattentive drivers. The size, shape, and spacing of the grooves formed during the cutting procedure shall be as shown on the plans unless a different configuration is approved by the Construction Engineer. Unless ordered otherwise by the Engineer, all grooves shall be perpendicular to the pavement edge.

The scoring equipment shall consist of a rotary type cutting head with cutting tips arranged in a pattern that will provide a smooth cut. The cutting head shall be on its own independent suspension from that of the power unit to allow the tool to align with the slope of the shoulder and any irregularities in the shoulder surface.

The equipment shall be operated in a workmanlike manner that will satisfactorily produce a pavement surface having uniform grooves of the dimensions and spacing as shown on the plans or specified in this Article. Equipment used to construct scored shoulders shall be positioned by using methods which will avoid scoring at locations other than those designated on the plans or directed by the Engineer. The debris that results from cutting shall be removed on a daily basis by a sweeper/vacuum or other approved methods.

428.04Method of Measurement

The scoring of bituminous pavement surface ordered and accepted will be measured per mile {kilometer} along the centerline of each row of grooves placed either by direct measurement and computation to the nearest 0.001 mile {0.001 kilometer} or by odometer to the nearest 0.001 mile {0.001 kilometer}. When more than one row of grooves is required on a surface, each row will be measured separately. The length of scoring measured will include any gaps shown on the plans as part of the design of the scoring but will not include the length of any other gap or section omitted by the Engineer.