*[INCLUDE THE FOLLOWING FOR B-W PARKWAY GUARDWALLS]{.mark}*

\$\$618.00A

######### Section 618.---CONCRETE BARRIERS AND PRECAST GUARDWALLS

Revised 8 May 2005

[]{.mark}

618.02. Delete the text and substitute the following:

> **(a)** Portland cement according to Subsection 701.01, except that
> cement shall be Type I or Type III, AASHTO M85, both white and gray or
> mixtures of white and gray, including pure mineral oxide pigments for
> coloring.
>
> **(b)** Furnish fine and coarse aggregates according to Subsections
> 703.01 and 703.02, except that facing aggregates, including both fine
> and coarse aggregates of the artificial stone facing, shall consist of
> limestone, quartz, and mica, including silicious stones according to
> ASTM C 33.
>
> **(c)** Furnish a cold applied gray polyurethane sealant meeting the
> requirements of ASTM C 920, Type S, Grade NS, Class 25. The joint
> sealants shall match the color of the false joints. Furnish backer rod
> conforming to Subsection 712.01(g).
>
> **(d)** Furnish reinforcing steel conforming to Subsection 709.01,
> AASHTO 31 M, Grade 60 [(AASHTO M 31M, Grade 420)]{.mark}. Reinforcing
> steel bars located less than 2 inches [(5 centimeters)]{.mark} from an
> exposed face, shall be either epoxy coated or galvanized. Furnish
> galvanized welded wire fabric.
>
> **(e)** Furnish Class A(AE) concrete with air entrained in the mix 6
> percent ± 2 percent by volume. In mixes containing coarse aggregates
> 0.4 inches or less in size, air entrained shall be 7 percent ± 2
> percent by volume. All concrete shall attain a 28-day minimum
> compressive strength of 4,000 pounds per square inch [(27.6
> MegaPascals)]{.mark} according to AASHTO T 22. Take a sufficient
> number of concrete cylinder samples for 7, 14, and 28-day compressive
> strength tests.
>
> **(f)** Furnish non-corrosive (galvanized or epoxy coated) bolts,
> inserts, and ties.
>
> **(g)** Furnish bedding material conforming to Subsection 703.03 for
> AASHTO M 43, size No. 57.

618.05. Add the following before the first paragraph:

Furnish a guardwall with a simulated stone surface on both sides and
ends of the guardwall and with an integral coping.

Submit the supplier\'s qualifications and certifications according to
Subsection 104.03. Furnish a certification from the supplier stating
that they have experienced personnel, physical facilities, established
quality control procedures, and management capability to produce the
required segments without delay to the project. The precast guardwall
supplier shall have a minimum of 5 years experience in manufacturing
architectural and structural precast concrete units.

Construct precast concrete mowing strips and false joints that are
uniform gray in color.

Provide capstones that span the entire width of the wall.

618.05(a). Delete the first sentence and substitute the following:

> A full size sample guardwall is located at *[(insert guardwall
> location)]{.mark}*.

618.05(c). Delete the fourth sentence and substitute the following:

> Prepare the foundation, compacting the bedding material with a minimum
> of 3 passes of a vibratory roller to ensure maximum consolidation, and
> place the sections.

618.08. Add the following:

The CO will accept precast segments on the basis of material tests on
the quality of the concrete and the CO\'s visual inspection. Perform all
necessary sampling and testing.