Replace Section 28-15 in the RSS for Section 28 With

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Section 28-15. Use when (1) replacing the existing base in conjunction with an individual slab replacement and (2) the base and slab replacement must be completed during the same lane closure. Limits for replace base must be shown.

Do not use when replacing full lanes of pavement. In this case use a separate bid item for remove under section 15 and a separate bid item for base under the applicable section.

Use with SSPs 28-3 and 28-4.

Replace section 28-15 in the RSS for section 28 with:

28-15 REPLACE BASE

28-15.01 GENERAL

Section 28-15 includes specifications for removing the existing base and constructing base.

Sections 15-2.02B and 15-3 do not apply to removing base.

RSCB must comply with section 28-3.

LCBRS must comply with section 28-4.

28-15.02 MATERIALS

Base must be one of the following:

1. RSCB

2. LCBRS

28-15.03 CONSTRUCTION

Do not remove the existing base with the overlying pavement. Remove only the portion that can be replaced during the same lane closure. If you fail to complete the replacement during the same traffic closure, construct temporary pavement structure under section 41-1.

The dimensions shown for replacing base are approximate. After you remove the overlying pavement, the Engineer determines the exact dimensions for replacing base. Obtain verbal authorization before saw cutting existing base.

Before removing existing base, saw-cut the outline of the base removal area using a power-driven saw. Cut on a neat line that is perpendicular to the pavement surface. Cut at least 2 inches deep except if the existing base is either CTB or any type of concrete base, cut full-depth.

Removal methods must not damage the existing base remaining in place. Do not impact existing base within 18 inches horizontally of the existing base to remain in place.

After removing existing base, grade the remaining underlying material under section 19-1.03C and compact it under section 19-5.03A.

If you remove material below the authorized depth, fill these areas by placing additional base material in the same operation as placing the new base at your expense.

28-15.04 PAYMENT

Reserved