SECTION 02576

ASPHALTIC CONCRETE SCARIFYING AND RECYCLING

PART	GENERAL

SECTION INCLUDES

Heating, scarifying, remixing, placing and compacting existing asphaltic concrete.

RELATED SECTIONS

Section 02510 - Asphaltic Concrete Paving.

Section [______-____________]: Removal [and storage] of existing parking bumpers.

Section 09900 - Painting: Traffic markings.

UNIT PRICE - MEASUREMENT AND PAYMENT

Pavement Surface Scarifying, Mixing, and Recycling:

Basis of Measurement: By the square [yard] [________] ([meter] [________]).

Basis of Payment: Includes surface cleaning, pre-heating, heating and scarifying, mixing and re-laying, compacting and rolling; protection to adjacent surfaces.

Recycling Agent:

Basis of Measurement: By the gallon ([liter]).

Basis of Payment: Includes proportioning and mixing.

Seal Coat:

Basis of Measurement: By the square [yard] [____] ([meter] [____]).

Basis of Payment: Includes preparing surfaces and applying.

REFERENCES

Asphalt Recycling and Reclaiming Association - Proven Guidelines for Hot-Mix Recycling.

MS-19 - Basic Asphalt Emulsion Manual, The Asphalt Institute (AI).

MS-20 - Asphalt Hot Mix Recycling, The Asphalt Institute (AI).

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Equipment: Submit a list of equipment intended for use on the Work.

Procedures: Submit a schedule of intended scarifying and rolling procedures.

QUALITY ASSURANCE

Perform Work in accordance with [[State] [Municipality] of [________] [Highways] [Public Work's] standard.]

Perform Work in accordance with [AI MS-20] [________].

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Scarifier: Company specializing in performing the work of this Section with minimum [__________] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to [applicable] [___________] code for spillage on municipal streets and flag persons near public areas.

PRE-INSTALLATION CONFERENCE

Convene [one] [_____] week prior to commencing work of this Section, under provisions of Section [01039.] [________.]

ENVIRONMENTAL REQUIREMENTS

Do not perform work when weather conditions will not permit successful completion of the Work.

Provide an additional heated scarifier unit to heat surface when ambient temperature is below [____] degrees F ([____] degrees C).

If ambient air temperature is below [50] [____] degrees F ([10] [____] degrees C), obtain approval prior to proceeding with the work.

PART	PRODUCTS

MATERIALS

Recycle Material: Existing in-place asphaltic concrete.

Virgin Mix Materials: Provide in accordance with [[State] [Municipality] of [________] [Highways] [Public Work's] standards.]

Asphalt Rejuvenating Agent: Hydrocarbon products, liquid form, physical and chemical properties, in accordance with the Asphalt Recycling and Reclaiming Association - Proven Guidelines for Hot-Mix Recycling.

Seal Coat: AI MS-19; [sand] [fog] [slurry] type; [________] manufactured by [____________].

EQUIPMENT

Recycler: Type for the intended purpose as follows:

Self-propelled; with automated mix controls.

Capable of processing [________] sq yd ([________] sq m) of surface per day.

****** [OR] ******

Heated Asphalt Scarifier: Type for the intended purpose as follows:

Self-propelled; a wheel base sufficient to maximize leveling action.

Operational heater width of [10] [____] feet ([3] [____] m) minimum to [12] [____] feet ([3.6] [____] m) maximum; protective hood over heated areas; heated, adjustable, direct flame heating not permitted.

Vibratory screed with hydraulic side extensions; [two] [____] rows of scarifying teeth functioning independently, spring mounted and located above road surface to enable deep penetration when required.

Adjustable blades or reversing auger to move recycled material along screed.

Capable of processing [5,500] [________] sq yd ([4 645] [________] sq m) of surface per day.

Compactor: Pneumatic tired roller for initial compaction; steel wheeled rollers required for additional compaction and smoothness. [An oscillating screed or tamper is not acceptable.]

PART	EXECUTION

RECYCLERS

[____________________________________].

[____________________________________].

[____________________________________].

PREPARATION

Mechanically sweep pavement surfaces immediately prior to commencement of work. Clean pavement surfaces of loose foreign matter. Verify that surfaces are dry.

Protect existing improvements, overhanging trees and plant life from heat damage by individual shielding [and water spray].

Remove and store [manhole covers and frames] [catch basin covers and frames] [________].

SCARIFYING

Do not disfigure adjacent Work.

Heat pavement surface uniformly by continuous movement of a heated [scarifier] [recycler].

Execute minimum scarification penetration to not less than [1/2] [____] inch ([12] [____] mm) at any point across the full width of surface.

MIXING

Mix scarified aggregate by spinning or tumbling action for asphalt rejuvenation.

Blend recycled material, recycling agent and virgin material in accordance with Asphalt Recycling and Reclaiming Association - Proven Guidelines for Hot-Mix Recycling.

****** [OR] ******

Blend recycled material, recycling agent and virgin material in accordance with [[State] [Municipality] of [________] [Highways] [Public Work's] standards.]

Maintain temperature of remixed material, directly behind the screed, as follows:

Air Temperature	Mix Temperature

Degrees F (C)	Degrees F (C)

50 (10)	250 (120)

60 (15)	240 (115)

70 (21)	230 (110)

PLACING

[Form a gutter cut [3/4] [____] inch ([19] [____] mm) deep tapered to a feather edge for a minimum of 1 m from lip of gutter; for subsequent surface overlay to be flush with the lip of the gutter.]

Spread remixed material [and added virgin material] by a heated vibratory screed to a consistent cross sectional thickness.

Place mixed material to [thicknesses indicated] [[____] inch ([____] mm) thick] [and] [to thickness not less than [____] inch ([____] mm)].

ROLLING AND COMPACTING

Roll and compact pavement materials to [elevations existing before commencing the Work.] [elevations noted.]

Complete the compaction process within [5] [____] minutes of scarifying.

Compact pavement by rolling. Do not displace or extrude pavement from position.

Develop rolling with consecutive passes to achieve even and smooth finish, without roller marks.

Re-install [manhole covers and frames] [catch basin covers and frames].

SEAL COAT

Apply seal coat to top surface of wearing course in accordance with [Asphalt Institute Manual MS-19.] [seal coat manufacturers instructions.]

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500.] [________.]

Do not permit traffic over surface for [2] [____] hours.

SCHEDULES

West Parking Area: North and west portions of asphaltic paved areas, as indicated on Site Plan.

South Parking Areas: All asphalt pavement surfaces.

END OF SECTION