2363PASSRC and PASB

2363.1DESCRIPTION

Permeable Asphalt Stabilized Stress Relief Course (PASSRC) is typically constructed on the in-place concrete or bituminous surface to act as a separation Layer and move water rapidly from beneath the unbonded concrete overlay.

Permeable Asphalt Stabilized Base (PASB) is typically constructed on a prepared base under a new concrete or bituminous surface to quickly drain surface infiltrated water accumulating under the pavement.

2363.2MATERIALS

A Aggregate ........................................................................................................................ 3139.2B Use PG 64S-22 D Mixture Design D.1 Sample Submittal At least 15 Working Days prior to the beginning of mixture production, submit representative samples of Aggregate and the asphalt binder to perform the PASSRC or PASB mix design in District Materials Laboratory where the Project is located. Submit Aggregates that require magnesium sulfate soundness at least 30 Calendar Days prior to the start of asphalt production. D.2 Aggregate D.2.a Submittal Submit to the District Materials Engineer a 100 pound sample of Aggregate retained on the No. 4 Sieve and 35 pounds of Aggregate passing the No. 4 Sieve. The Contractor will obtain and store an equal size sample until the Mixture Design Report

D.2.b Intent to Sample Provide the Department with 24 hour advance notification. D.2.c Testing Test for the quality of each source, class, type, and size of virgin and non- asphaltic salvage Aggregate source for the mix design. D.3 Asphalt Binder D.3.a Submittal Submit four 1-quart samples of the same PG grade as required and also from the same supplier as production will come from. D.4 Mixture Provide the proposed job mix blend for each combination of Aggregates to be used in the mixture. Include the following information: D.4.a Composite gradation Based on the proportions of each Material, determine the composite gradation in percent of total Aggregates. D.4.b Individual gradation Determine the gradation for each individual component.

D.4.c Source Document the Aggregate source, pit number, and a description of all Materials. D.5 Mixture Design Report The Engineer will issue a Mixture Design Report (MDR) when the mixture design is successfully completed. The MDR will include the job mix formula (JMF) requirements for gradation and asphalt cement content. Paving without an MDR is not allowed. E Mixture Quality Management E.1 Sampling and Testing Production sampling and testing rates for start-up and production are shown in the Schedule of Materials Control (MCS). Take Aggregate quality samples as directed by the Engineer. Sample the following items in accordance with the MCS:

E.2 Documentation Include the following production test rests, and mixture on the Department approved Test Summary sheet.

E.3 JMF Limits The mixture production targets and JMF limits, as shown in Table 2363.2-1, are listed on the MDR. Field results may deviate from the JMF target; however, JMF limits as show below are used as the Specification limits for acceptance. Table 2363.2-1 JMF Limits Item JMF Limits Gradation Gradation Broadband Asphalt Binder Content -0.4 percent

2363.3CONSTRUCTION REQUIREMENTS

A Handling and Placement A.1 Mixing and Compaction Temperature Use binder supplier recommended temperatures. Unless authorized by the Engineer, do not produce the mixture no more than 30°F above the recommended maximum mixing temperature. The Department will not pay for or allow placement of any mixture produced at more than 30°F above the recommended maximum mixing temperature.

A.2 Rutting of Existing Surface Equipment used to deliver or place the mixture cannot rut the in-place Aggregate base

repaired and leveled to satisfaction of the Engineer, at no cost to the Department, prior to placing the mixture so that water draining through the mixture will not pond and create soft spots in the base/Subgrade. B Surface Preparation Remove loose or deteriorated surfacing and clean the surface by power sweeping and air blasting. Removal of deteriorated areas from joints, cracks, bituminous patched areas, etc. may require air blasting, the use of a small milling machine, or handwork as directed by the Engineer . Air blasting must be performed with at least 100 psi Equipment. Tack surface of inplace pavement in accordance with 2357, “Bituminous Tack Coat.” C Maintenance The Contractor is responsible to maintain the integrity of the PASSRC or PASB until the concrete or bituminous pavement is placed on it. Any deficiencies in thickness, Smoothness, or density need to be corrected. C.1 Contamination Keep the PASSRC and PASB and associated drains free of soils or other contaminates . Contaminated Material shall be removed and replaced by the Contractor to the satisfaction of the Engineer at no cost to the Department. C.2 Drainage Maintain drainage so water is not allowed to pond in the PASSRC or PASB. C.3 Construction Equipment Concrete hauling units, either loaded or empty, are permitted on the PASSRC. Only the paver, rollers, and bituminous haul trucks are allowed to drive on the PASB . The bituminous haul trucks can only drive on the PASB immediately in front of the paver to unload, and then leave the PASB as soon as the bituminous is unloaded. C.4 Density PASSRC and PASB need to be dense and stable after construction so it will not rut when the overlying pavement is placed. C.5 Damage The Contractor will repair the PASB or PASSRC promptly by the Contractor, as directed by the Engineer, at no expense to the Department. D Pavement Density D.1 Method ........................................................................................................... 2360.3D.2 D.2 Temperature The Contractor is advised that it may be necessary to permit the permeable asphalt Layer to cool sufficiently before compaction rolling to prevent rutting and shoving. In no case will compaction be allowed at less than 110°F. D.3 Water Water may not be used to accelerate the cooling process.

D.4 Rollers Self-propelled steel wheeled compacting Equipment must weigh at least 8 tons. Rollers must be steel wheeled both front and back and capable of reversing without backlash and equipped with spray attachments for moistening both rollers. Vibratory compaction will not be allowed. When the mixture placed exceeds 100 tons per hour, at least two rollers must be used . Adequacy of compaction to provide stability will be judged by the Engineer . Over rolling, to the extent that Aggregate particles degrade, is not permitted. E Verification Testing Verification testing will be performed on the Quality Assurance samples for gradation and coarse Aggregate angularity. The Department will monitor 1 asphalt binder content spotcheck per day. Allowable differences (tolerances) between Contractor and Department test results are specified below in Table 2363.3-1. Substitute the Department results for acceptance when the tolerance is exceeded. Table 2363.3-1 Allowable Differences between Contractor and Department Test Results Item Allowable Difference Coarse Aggregate angularity, percent fractured faces (percent P) 15 percent Gradation Sieve, percent passing No. 4 and larger 5 percent Gradation Sieve, percent passing No. 30 3 percent Gradation Sieve, percent passing No. 200 2 percent F Thickness and Smoothness Requirements F.1 Elevation The finished surface of permeable asphalt Layer at any point of measurement must not vary be more than ±5/8 inch from the prescribed elevation for that point as determined from the grades staked by the Engineer and the cross-section in the Plan. F.2 Thickness Within ±1/4 inch of the compacted depth shown on the typical section in the Plan. F.3 Deficient The Contractor will correct any areas which are deficient by more than 1/4 inch by scarifying, adding mixture, compacting, shaping, and finishing in accordance with these Specifications, or directed by the Engineer. F.4 Tolerances Normal Specification tolerances apply for bituminous and concrete.

2363.4METHOD OF MEASUREMENT

Measurement for PASB and PASSRC will be in accordance with the following. Bituminous mixture and bituminous Material for mixture will be paid for separately. Measurement will be made by the weight of bituminous mixture for the permeable asphalt Layer. Payment will be made at the Contract bid price per ton. Payment for the accepted bituminous mixture will be payment in full for all costs of constructing the permeable asphalt L ayer, including the costs of mixture production, Aggregate incorporation, placement, and compaction. Cost for bituminous Material is specifically excluded. Measurement will be made by the weight of bituminous Material incorporated into the permeable asphalt Layer. Payment will be made at the Contract bid price per ton. Payment for bituminous Material, based on the acceptance of the permeable asphalt Layer, will be payment in full for bituminous Material, any additives, and the incorporation of the bituminous Material into the mixture.

2363.5BASIS OF PAYMENT

Payment for the accepted quantity of permeable asphalt Layer at the Contract Unit Price of measure will be compensation in full for all costs of furnishing and applying all Materials required in this Specification. The Unit Price includes all labor, Materials, and Equipment necessary to complete the Work. Payment for geotextile, when required for widening designs, is included in the 2363, “PASSRC and PASB,” bid item. A Monetary Adjustments The Department must apply Incentives and Disincentives and may apply monetary deductions for PASSRC and PASB. The amounts of these adjustments are deemed reasonable. A.1 Failing Materials The determination of monetary deductions for failing Materials will be based on the Specification limits outlined in Table 2363.5-1 as shown below for that specific test. Reduced payment as shown in the table below will be applied to all tonnage represented by the individual test results that do not meet the limits. The Contractor cannot continue to produce failing mixture. A continual basis is defined as all lots in a day’s production failing to meetS pecification requirements for gradation, crushing, or binder content, or more than 50 percent of the lots on two or more consecutive days which fail to meet Specification requirements for gradation, crushing, or binder content. Table 2363.5-1 Reduced Payment Schedule Item Monetary Deduction, percent * Gradation 5 Coarse Aggregate crushing 10 Asphalt binder contentǁ 10 * Apply the lowest monetary deduction when using multiple reductions on a single test. ǁ Not for asphalt content in excess of allowable tolerance provided there is no visual observation of asphalt drain down. B Schedule The Department will pay for PASSRC and PASB on the basis of the following schedule: Item No. Item Unit

2363.509 Bit Mix for Perm Asphalt Stabilized Stress Relief Crse ton

9 Bit Mix for Perm Asphalt Stabilized Base ton

9 Bit Material for Mixture ton