505 - Chip Seals

505 Chip seal

GENERAL DESCRIPTION

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Definitions and Terms

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General Overview

Chip sealing is a common preventive maintenance activity across the State of Michigan. It involves spraying asphalt cement on the surface of an existing pavement followed by the application of a cover aggregate. The asphalt cement is emulsified (suspended in water) to allow for it to be applied without the addition of extreme heat. The cover aggregate is typically either naturally occurring gravel or crushed aggregate such as granite, quartzite, or trap rock (basalt), or limestone. Steel blast furnace slag is also used with great success.

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Contractor Prequalification

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Code of Federal Regulation (CFR) / FHWA Regulations

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MATERIALS

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Description of Materials Used

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Pictures of Materials

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EQUIPMENT

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Description of Equipment Used

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Equipment Specifications

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Pictures of Equipment

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PRECONSTRUCTION

Submittals and Shop Drawings

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Permits

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Qualified Products List (QPL)

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Plant Inspections

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Contractor Submitted Plans/Procedures

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CONSTRUCTION

Construction Requirements/Procedures/Installation Methods

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Safety

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Productivity information/charts

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Items of Note

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Layout / Survey

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INSPECTION & TESTING

Inspection Procedures

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Special Attention Areas

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QA/QC Tests

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Lab Testing / Field Testing

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Rejection/Remedial Actions=

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MEASUREMENT, DOCMENTATION & PAYMENT

Measurement

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Documentation Requirements

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Basis of Payment

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LOCAL AGENCY PROJECTS

Only if applicable

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RAIL PROJECTS

Only if applicable

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505 Chip seal

GENERAL

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MATERIALS

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CONSTRUCTION

Double Chip Seal Seasonal Limitation

a. From June 1 to August 1 in the Upper Peninsula b. From May 15 to August 15 in the Lower Peninsula north of M-46 c. From May 15 to August 31 in the Lower Peninsula south of M-46

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Longitudinal Construction Joints

Longitudinal Construction Joints in Double Chip Seal – Concern has been raised that the double chip seals are filling in centerline corrugations too much. As a result the special provision 20SP505(B) Warranty Work Requirements for Double Chip Seals contains language specifying that the base course of the chip seal will go up to the corrugations but not cover them. The top course will be the only one that will cover the corrugations.

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Fog Seals

Chip Seals with Fog Seal - Delay times

As per spec, complete application of the fog seal within 48 hours of the application of chip seal, but not on the same day as the application of chip seal.

Because the fog seal prevents stone loss and also the temporary raised markings have taken a beating (especially on a double chip seal) the first application of pavement markings after a fog seal may be placed the next day.

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MEASUREMENT AND PAYMENT

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