2356Bituminous Seal Coat and Bituminous Underseal

2356.1DESCRIPTION

This Work applies to both a Bituminous seal coat, which goes on top of a bituminous surface and a bituminous underseal, which is placed beneath a new bituminous surface. This section applies to both processes, unless it is specified only for the Bituminous seal coat or the bituminous underseal. The Work consists of applying bituminous Material, a single Layer of Aggregate, and a fog seal on a prepared surface.

2356.2MATERIALS

A Bituminous Material A.1 Seal coat .......................................................................................................... 3151.2E.1 A.2 Bituminous emulsion for Fog Seal ................................................................ 3151.2D.1.a B Seal Coat Aggregate Provide Aggregate meeting the gradation, job mix formula tolerance, and quality requirements of Table 3127.2-1and Table 3127.2-2, for the gradation specified in the Contract. If no requirements are specified in the Contract, provide Aggregate meeting the requirements of Table 3127.2-1 and Table 3127.2-2 for FA-2.5.

D Seal Coat Design Use the Minnesota Seal Coat Handbook, MN/RC-2006-34 available on the MnDOT website, to design the seal coat and determine the starting application rate for the bituminous Material and seal coat Aggregate. Base the mix design on the traffic volume and pavement conditions . Provide the following to the Engineer at least 2 weeks before beginning construction:

The Contractor cannot start Work until submittal of the design and approval by the Engineer in accordance with the requirements of this section.

2356.3CONSTRUCTION REQUIREMENTS

A Weather, Time and Date Limitations A.1 Bituminous Seal Coat Apply the bituminous seal coat in accordance with the following:

Restriction Zone (Zones are defined on the MnDOT Pavement Design website)

Spring Road Restriction Zone

water

A.2 Bituminous Underseal Construct bituminous underseal operations (including traffic restrictions on the freshly constructed bituminous underseal) according to the following:

and Paving Date” B Equipment B.1 Distributor ................................................................................................... 2360.3B.2.d B.2 Aggregate Spreader Use a self-propelled mechanical type Aggregate spreader, mounted on pneumatic-tired wheels, capable of distributing the Aggregate uniformly to the width required by the Contract and at the design application rate. B.3 Pneumatic-Tired Rollers Provide at least three self-propelled Pneumatic-tired rollers in accordance with 2360.3B.2.e(2), “Pneumatic Tired Rollers.”

B.4 Brooms Provide motorized brooms with the following characteristics:

C Road Surface Preparation Clean pavements, including depressions, before seal coating. Cover iron fixtures in or near the pavement to prevent adherence of the bituminous Material . Remove the protective coverings before opening the Road to traffic. D Application of Bituminous Material D.1 Pre-Treat Longitudinal Pavement Markings Apply bituminous Material 1 foot wide over all longitudinal pavement markings. Cover centerline skip stripe with continuous coverage. Apply in a rate range of 0.10 to 0.15 gallons per square yard. Apply bituminous Material for seal coat immediately after pre-treating pavement markings. D.2 Application of Bituminous Material for Seal Coat Begin the rate of application for the bituminous Material as determined by the mix design. Construct a test strip 200 feet long to ensure the bituminous Material application rate is adequate given the field conditions. After applying the bituminous Material to this test strip, place the seal coat Aggregate at the design application rate. Inspect the Aggregate in the wheel paths for proper embedment. Make adjustments to the rate of application, if necessary. Construct one full lane width at a time. Apply the bituminous Material in accordance with Table 2356.3-1: Table 2356.3-1 Recommended Application Temperatures Bituminous Material Minimum Temperature CRS-2P 140°F E Application of Aggregate Before construction, if required by the Engineer, calibrate the Aggregate spreader to meet the requirements of ASTM D5624, Standard Practice for Determining the Transverse-Aggregate Spread Rate for Surface Treatment Applications, in the presence of the Engineer. Maintain the Aggregate application rate within ±1 pound per square yard of the design. Provide uniformly moistened Aggregates at the time of placement. Place Aggregate within 1 minute after applying the bituminous Material. Do not use previously applied Aggregates. F Rolling Operations Complete the initial rolling within 2 minutes after applying the Aggregate at a speed no greater than 5 mph to prevent turning over Aggregate. Make at least 3 complete passes over the entire width of the treatment area. G Sweeping Remove surplus Aggregate on the same day as the seal coat construction. Resweep areas the day after the initial sweeping. Dispose of the surplus seal coat Aggregate as approved by the Engineer.

H Protection of the Surface Do not allow traffic on the seal coated Road surface until after rolling is completed and the bituminous Material has set. I Protection of Motor Vehicles The Contractor is responsible for claims of damage to vehicles until the R oadways and Shoulders have been swept free of loose Aggregate and permanent pavement markings have been applied. If the Department applies the permanent pavement markings, the Contractor’s responsibility ends after completion of the fog seal and placement of temporary pavement markings. J Application of Bituminous Material for Fog Sealing A bituminous seal coat requires the application of a bituminous fog seal. A bituminous underseal only requires the application of a fog seal if the bituminous underseal is not paved over within 7 Calendar Days. Apply the fog seal in accordance with 2355, “Bituminous Fog Seal,” and as modified as follows:

necessary to yield a uniform full coverage of the underlying seal coat

K Progress of Work Allow the seal coat to cure for at least one Calendar Day before applying the fog seal. Place interim pavement markings after the fog seal cures and before removal of traffic control . After placing the fog seal, wait at least 3 Calendar Days before placing permanent pavement markings when using latex paint. Place all other types of permanent pavement markings at least 14 Calendar Days after placement of the fog seal. L Contractor Sampling and Testing Sample and test according to the rates in the Schedule of Materials Control . Submit test results to the Engineer within 24 hours of test completion. Verify and report the average daily bituminous Material application rate by dividing the volume used by the area covered. If gradations fall outside of the job mix formula tolerance of Table 3127.2-1, but within Specifications, stop placement and submit a new mix design. Provide a remediation Plan for all failures originating by any cause including a failing stockpile or poor handling procedures. Bucket blending of a stockpile to remediate for failing Material is not acceptable. The remediation Plan must be accepted by the Engineer. M Department Quality Assurance (QA) Sampling and Testing Sample and test according to the rates in the Schedule of Materials Control .

2356.4METHOD OF MEASUREMENT

The Engineer will measure the bituminous Material for fog seal per 2355.4, “Bituminous Fog Seal, Method of Measurement.” Conversion factors are located in the Bituminous Manual . The Engineer will measure the Bituminous Material for seal coat by volume at 60°F.

The Engineer will measure the seal coat by area of pavement surfaced.

2356.5BASIS OF PAYMENT

For Bituminous seal coat, the Department will pay for Bituminous Material for fog seal in accordance with 2355.5, “Bituminous Fog Seal, Basis of Payment.” For bituminous underseal, payment for Bituminous Material for fog seal is included in the 2356, “Bituminous Seal Coat and Bituminous Underseal,” bid item. The Contract gallon price for accepted quantities of Bituminous Material for seal coat, including necessary additives, includes the costs of providing and applying the Material as required by the Contract. The Contract square yard Unit Price for Bituminous seal coat includes the cost of providing and applying the Material as required by the Contract. The Contract square yard price for Bituminous seal coat includes the cost of all applied Aggregate and all testing. A Monetary Adjustments The Department must apply Incentives and Disincentives and may apply monetary deductions for Bituminous Seal Coat and Bituminous Underseal. The amounts of these adjustments are deemed reasonable. The Engineer will calculate the monetary deduction instead of removing and replacing failing Materials in accordance with the following:

10 percent for each failing quality test per Table 3127.2-2 as determined by QA testing.

0.5 percent for each 1 percent passing outside of the requirements for any Sieve as specified in 3127, “Fine Aggregate for Bituminous Seal Coat,” except for the No. 200 Sieve, as determined by QA testing.

for each 0.1 percent passing outside of the requirements for the No. 200 Sieve as specified in 3127, “Fine Aggregate for Bituminous Seal Coat,” as determined by QA testing.

cumulative reduced payment greater than 50 percent is subject to remove and replace per 1512.1 “Unacceptable Work.” Subsection 2356.5A, “Monetary Adjustments,” notes (1), (2), and (3) are based upon the Contract bid price for Bituminous seal coat, however if the Contract bid price is less than 75 percent of the Department’s average bid price for Bituminous seal coat, the Engineer may use the average bid price to assess the monetary deduction. The Engineer will add the reduced payments for all failing test results together. B Schedule The Department will pay for Bituminous seal coat and Bituminous underseal on the basis of the following schedule: Item No. Item Unit

2356.504 Bituminous Seal Coat square yard

6 Bituminous Material for Seal Coat gallon