Attachement 13 - 32 12 36SF Emulsified Slurry Seal - KPFF.pdf

KPFF – Short Form June 2010

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SECTION 32 12 36 – EMULSIFIED SLURRY SEAL

PART 1 - GENERAL

1.1 SUMMARY

A. The work shall consist of mixing asphaltic emulsion, aggregate, set-control additives and water, and spreading the mixture on a surfacing or pavement.

1.2 SUBMITTALS

A. Product Data: For each type of product indicated. Include technical data and tested physical and performance properties.

B. Asphaltic Emulsion: Certification, by authorities having jurisdiction, of approval of each job mix proposed for the Work.

C. Material certificates.

D. Log of slurry seal application, including dates, times, temperature readings and other pertinent information.

1.3 QUALITY ASSURANCE

A. Manufacturer Qualifications: Manufacturer shall be registered with and approved by authorities having jurisdiction or the DOT of the state in which Project is located.

B. Standard Specifications: Comply with latest editions and supplements for Caltrans Standard

Specifications Sections 37 and 94. These Specifications apply only to performance and materials and how they are to be incorporated into the Work. The legal/contractual relationship sections and the measurement and payment sections do not apply to this document.

1.4 PROJECT CONDITIONS

A. Environmental Limitations: The slurry seal shall not be applied if either the pavement or air temperature is below 50 degrees Fahrenheit. and falling, but may be applied when both pavement and air temperatures are above 45 degrees Fahrenheit and rising. No slurry seal shall be applied when there is a possibility of freezing temperatures at the project location within 24 hours after application.

B. Pavement-Marking Paint: Proceed with pavement marking only on clean, dry surfaces and at a minimum ambient or surface temperature of 40 degrees Fahrenheit for oil-based materials, 50 degrees Fahrenheit for water-based materials, and not exceeding 95 degrees Fahrenheit.

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PART 2 - PRODUCTS

2.1 ASPHALTIC EMULSION

A. Asphaltic emulsion shall be a quick-setting type, grade QS1h anionic, or grade CQS1h cationic, conforming to the provisions in Caltrans Standard Specifications Section 94, Table 4. The grades of asphaltic emulsion shall be at the option of the Contractor.

2.2 AGGREGATE

A. Aggregate shall conform to the provisions in Caltrans Standard Specification Section 37-

3.01A(4)(c), Type I.

2.3 WATER

A. Water shall be such quality that the asphalt will not separate from the emulsion before the slurry seal is in place in the work. If necessary for workability, a set-control agent that will not adversely affect the slurry seal may be used.

2.4 MIX DESIGN

A. Compatibility of the emulsified asphalt, aggregate, water and additives shall be evaluated in the mix design. The slurry seal mixture shall conform to the requirements specified when tested in accordance with the Caltrans Standard Specifications Section 37-2.03.

2.5 PAVEMENT MARKING PAINT

A. Pavement-Marking Paint: Latex, waterborne emulsion, lead and chromate free, ready mixed, complying with Caltrans Standard Specifications - Section 84 (Federal Specification No. TT-P-

1952 for Blue, Red and Green paint; and State of California Standard Specification No. PTWB-

01 for White, Yellow and Black paint) with drying time of less than 45 minutes.

1. Color: White.

PART 3 - EXECUTION

3.1 SURFACE PREPARATION

A. Prior to applying the slurry seal, loose material, oil spots, vegetation, and other objectionable material shall be removed. A standard cleaning method such as sweeping, flushing, or other means will be acceptable. If water is used, cracks shall be allowed to dry thoroughly before slurry surfacing. Manholes, valve boxes, catch basins, and other utility boxes shall be protected from slurry seal by a suitable method.

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B. Treat cracks wider than 0.25 inches in the pavement surface with an approved crack sealer prior to application of slurry seal.

3.2 PLACING

A. The slurring mixture shall be uniformly spread on the existing surfacing within the rate specified without spotting, re-handling or otherwise shifting of the mixture.

B. Slurry seal shall not be placed when the atmospheric temperature is below 50 degrees

Fahrenheit or during unsuitable weather.

C. Slurry seal shall be spread at a rate specified in Caltrans Standard Specifications Section 37-

2.06.

D. The mixture shall be uniform and homogeneous after spreading on the existing surfacing and shall not show separation of the emulsion and aggregate after setting.

E. Lumping, balling, or unmixed aggregate will not be acceptable.

F. Adequate means shall be supplied to protect slurry seal from damage by traffic until such time that the mixture has cured sufficiently so that the slurry seal will not adhere to and be picked up by the tires of vehicles.

G. No excess buildup, uncovered areas, or unsightly appearance shall be permitted on longitudinal or traverse joints. The contractor shall supply suitable equipment to produce a minimum number of longitudinal joints throughout the project. When possible, a longitudinal joint shall not be place in a wheel path. Less than full box width passes will be used only as required. If less than full box width passes are used, they shall not be the last pass of any paved area. A maximum of six inches shall be allowed for overlap of longitudinal joints.

H. Area which cannot be accessed by the mixing machine shall be surfaced using hand squeegees to allow complete and uniform coverage. If necessary, the area to be handworked shall be lightly dampened prior to mix placement. Handwork shall exhibit the same finish as that applied by the spreader and shall be completed prior to final surfacing.

I. Care shall be taken to apply straight lines along curbs and gutters. No run-off on these areas will be permitted. Roofing felt or heavy plastic may be used to begin or end a pull cleanly.

J. Rolling is not necessary for slurry seal on roadways. Parking areas shall be rolled by a self-propelled, 10-ton (maximum) pneumatic tire roller equipped with a water spray system. All tires shall be inflated per manufacture’s specifications. Rolling shall not start until the slurry has cured sufficiently to avoid damage by the roller. Areas which require rolling shall receive a minimum of two full coverage passes.

3.3 PAVEMENT MARKING

A. Do not apply pavement-marking paint until layout, colors, and placement have been verified with Architect.

B. Allow paving to age for 30 days before starting pavement marking.

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C. Sweep and clean surface to eliminate loose material and dust.

D. Apply paint with mechanical equipment to produce pavement markings, of dimensions indicated, with uniform, straight edges. Apply at manufacturer's recommended rates to allow a minimum wet film thickness of 15 mils.

3.4 FIELD QUALITY CONTROL

A. Testing Agency: Owner will engage a qualified independent testing and inspecting agency to perform field tests and inspections and to prepare test reports.

B. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

C. Remove and replace or install additional slurry seal mixture where test results or measurements indicate that it does not comply with specified requirements.

3.5 DISPOSAL

A. Except for material indicated to be recycled, remove excavated materials from Project site and legally dispose of them in an Environmental Protection Agency (EPA) approved landfill.

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