\$\$552.00A

######### Section 552.---STRUCTURAL CONCRETE

Revised 2 October 2005

*[INCLUDE THE FOLLOWING FOR COLORED CONCRETE]{.mark}*

\$\$552.02A

552.02. Add the following:

> Concrete coloring agents 711.05

\$\$552.03A

552.03. Add the following:

All concrete in *[\[insert item description\]]{.mark}* will be
integrally colored by adding a concrete coloring agent. The colored
concrete after curing shall match as closely as practicable to Standard
Color Chart Number *[\[insert #\]]{.mark}* of Federal Specification
595B.

Prepare 5 square textured test panels with each panel being 1-foot [(0.3
meters)]{.mark} square. Determine coloring agent batch amounts by
weight. The maximum amount of coloring agent is not to exceed 10 percent
of the weight of the cement. Use coarse and fine aggregates and cement
as delivered on the project at the job mix rates with variable
quantities of coloring agent as directed by the CO. Provide additional
mixing time as recommended by the manufacturer. Give the test panels a
*[\[insert type\]]{.mark}* finish in accordance with the contract
requirements.

After the test panels have had at least 2 weeks exposure to sun, the CO
will select a test panel to serve as a guide for the colored concrete.
Use the same rate of coloring agent used in the selected panel on all
relative subsequent work. Include the approved amount of coloring agent
in the concrete mix design submittal.

Use an approved form release agent which will produce a minimum of
staining, air holes, and hydration discoloration.

*[INCLUDE THE FOLLOWING IF APPLICABLE]{.mark}*

\$\$552.03B

552.03(g). Add the following:

\$\$552.03C

> Use Type I or II portland cement in all concrete.

\$\$552.03D

> Use Type I, II, or III portland cement in all Class P concrete.

[]{.mark}

*[INCLUDE THE FOLLOWING FOR BRIDGE DECK CONCRETE, EXCEPT WHEN REASONS
ARE NOTED FOR EXCLUDING HIGH RANGE WATER REDUCERS]{.mark}*

\$\$552.03F

552.03(v). Add the following:

> Provide Class *[(insert class)]{.mark}* concrete with a minimum 28-day
> compressive strength of *[(insert strength)]{.mark}* pounds per square
> inch [(MegaPascals)]{.mark}.

*[INCLUDE THE FOLLOWING IF APPLICABLE]{.mark}*

\$\$552.09A

552.09(b)(4). Add the following:

Provide for compressive strength testing of the concrete cylinders by an
independent laboratory, qualified to perform the testing, and as
approved by the CO.

[]{.mark}

*[INCLUDE THE FOLLOWING FOR CONCRETE REPAIRS]{.mark}*

\$\$552.11A

552.11(a). Add the following to the third paragraph:

> Dispose of mortar, debris, foreign material and excess concrete
> according to Section 203.

552.11(a). Add the following:

> Before placing new concrete, clean the existing concrete surface and
> any exposed reinforcement of all loose material, dust, etc., by
> shotblasting and thoroughly flushing with clean water under pressure
> or compressed air. If compressed air is used provide a filter in the
> air line to ensure that the air is oil‑free.
>
> If there is an interval of more than 24 hours between cleaning of the
> sound concrete surface and placement of new concrete, or there are
> previously prepared concrete surfaces that have been contaminated by
> any substance detrimental to good bonding, clean or remove the
> concrete.
>
> Saw cut approximately 0.75 inches [(2 centimeters)]{.mark} deep along
> all boundaries of the repair areas. Point saw cuts, extending beyond
> the limits of repair areas, flush with the surface with portland
> cement or epoxy mortar.
>
> Where the bond between existing concrete and reinforcing steel has
> been destroyed, remove the concrete adjacent to the steel to a depth
> that will permit new concrete to bond to the entire periphery of the
> exposed steel. Provide a minimum of 0.75 inches [(2
> centimeters)]{.mark} clearance behind the steel.
>
> Remove and replace all badly deteriorated reinforcing steel.
>
> After removal of deteriorated or unsound concrete, shotblast exposed
> structural steel, reinforcing steel, and any concrete surfaces which
> will be in contact with repair material until free of rust and foreign
> material. Clean the sound concrete surface by flushing with clean
> water from a high pressure water jet or compressed air.

[]{.mark}

*[INCLUDE THE FOLLOWING FOR CONCRETE REPAIRS PATCHES \< 5 inches (12.5
centimeters) DEEP]{.mark}*

\$\$552.11B

> For all vertical and overhead concrete repairs, and those horizontal
> repairs to areas less than 5 inches [(12.5 centimeters)]{.mark} in
> depth, use a high strength concrete patching compound placed according
> to the manufacturer\'s recommendations.

[]{.mark}

*[INCLUDE THE FOLLOWING FOR CONCRETE REPAIRS PATCHES [\>]{.underline} 5
inches (12.5 centimeters) DEEP, MUST SPECIFY CLASS]{.mark}*

\$\$552.11C

> For all other repairs, apply a bonding coat of a 2-component epoxy
> resin binder to the surfaces of the sound existing concrete
> immediately before placing new concrete against it. Follow the
> manufacturer\'s recommendations for the epoxy resin binder. Repair
> areas using Class *[(insert class)]{.mark}* concrete.

[]{.mark}

*[INCLUDE THE FOLLOWING FOR CONCRETE CURBS ON THE STRUCTURE]{.mark}*

\$\$552.11D

552.11(f). Delete the first sentence and substitute the following:

> **(f) Concrete railings, parapets, and curbs.**

[]{.mark}

*[INCLUDE THE FOLLOWING FOR CONCRETE REPAIRS]{.mark}*

\$\$552.19A

552.19. Add the following:

Materials used for concrete repair will be evaluated under Subsection
106.03.