96E02/14/07

S552-96E.doc

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  Use on projects when structural concrete is required. Generally
  structural concrete is required for bridges, culverts, walls, and
  foundations (items that require load analysis or "that you can drive
  on"). A low water crossing may be paid under Section 552 or 501 as
  determined by the Design Team (including roadway designer, bridge
  engineer, and pavements engineer).

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**Section 552. - STRUCTURAL CONCRETE**

**Material**

**552.02** [Add the following:]{.underline}

> Concrete Coloring Agent 711.05
>
> Precast Reinforced Concrete Box Sections 706.07
>
> Precast Concrete Units 725.11

**Construction Requirements**

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  When structural concrete is required, include 703.02 and the following:

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**552.03 Composition (Concrete Mix Design).** [Delete the first sentence
of the first paragraph and Table 552-1 and substitute the
following:]{.underline}

Design and produce concrete mixtures that conform to Tables 552-1 and
552-1A for the class of concrete specified.

**Table 552-1**

Composition of Concrete

+-------------+-----------------+----------+---------+---------------+
| **Class of  | **Minimum       | *        | **Slump | **Maximum     |
| Concrete**  | Cement          | *Maximum | ^(1)^** | Nominal       |
|             | Content**       | W/C      |         | Coarse        |
|             |                 | Ratio**  | **(in   | Aggregate**   |
|             | **(pound per    |          | ches)** |               |
|             | cubic yard)**   |          |         | **Size        |
|             |                 |          |         | ^(5)^**       |
|             |                 |          |         |               |
|             |                 |          |         | **(inches)**  |
+-------------+-----------------+----------+---------+---------------+
| A           | 611             | 0.49     | 2 to 4  | 1½            |
+-------------+-----------------+----------+---------+---------------+
| A(AE)       | 611             | 0.44     | 1 to 4  | 1½            |
+-------------+-----------------+----------+---------+---------------+
| B           | 517             | 0.58     | 2 to 4  | 2½            |
+-------------+-----------------+----------+---------+---------------+
| B(AE)       | 517             | 0.58     | 2 to 4  | 2½            |
+-------------+-----------------+----------+---------+---------------+
| C           | 658             | 0.49     | 2 to 4  | ¾             |
+-------------+-----------------+----------+---------+---------------+
| C(AE)       | 658             | 0.44     | 1 to 3  | ¾             |
+-------------+-----------------+----------+---------+---------------+
| D(AE)^(2)^  | 611             | 0.40     | 1 to 3  | 1½            |
+-------------+-----------------+----------+---------+---------------+
| E(AE)^(3)^  | 611             | 0.40     | 4 to 6  | ¾             |
|             |                 |          | ^(4)^   |               |
+-------------+-----------------+----------+---------+---------------+
| P           | 658             | 0.44     | 0 to 4  | 1             |
| (P          |                 |          |         |               |
| restressed) |                 |          |         |               |
+-------------+-----------------+----------+---------+---------------+
| P(AE)       | 658             | 0.44     | 0 to 4  | 1             |
+-------------+-----------------+----------+---------+---------------+
| Seal        | 658             | 0.54     | 4 to 8  | 1½            |
+-------------+-----------------+----------+---------+---------------+

> ^(1)^ Maximum slump is 8 inches if approved mix design includes a
> high-range water reducer.
>
> ^(2)^ Concrete with a water reducing and retarding admixture
> conforming to AASHTO M 194, type D.
>
> ^(3)^ A latex modified concrete with 0.037 gallons of modifier per
> pound of cement.
>
> ^(4)^ Measure the slump 4 to 5 minutes after the concrete is
> discharged from the mixer.
>
> ^(5)^ Meeting the processing requirements of AASHTO M43, Table 1 --
> Standard Sizes of Processed Aggregate.

**Table 552-1A**

Minimum Air Content for Air Entrained Concrete

  -------------------------------------- --------------------------------
  **Nominal Maximum Aggregate Size       **As Delivered Minimum Air
  ^(1)^**                                Content ^(2)\ (3)^ (%)**

  2½ inch                                3.5

  2 inch                                 3.5

  1½ inch                                4.0

  1 inch                                 4.5

  ¾ inch                                 4.5

  ½ inch                                 5.5
  -------------------------------------- --------------------------------

> ^(1)^ Meeting the processing requirements of AASHTO M 43, Table 1 --
> Standard Sizes of Processed Aggregate.
>
> ^(2)^ These air contents apply to the total mix. When testing these
> concretes, aggregates larger than 1½ inches is removed by handpicking
> or sieving, and air content is determined on the minus 1½-inch
> fraction of the mix. Air content of the total mix is computed from the
> value determined on the minus 1½-inch fraction.
>
> ^(3)^ For P(AE) concrete, the as delivered minimum air contents may be
> reduced 1.0 % and the maximum air content is 6.0 %

+-----------------------------------------------------------------------+
| When a hydration stabilizing admixture may be approved for use,       |
| include 552.08, 552.09, 711.03 **and** the following:                 |
|                                                                       |
| **NOTE TO DESIGNER:** This section is formatted slightly different    |
| than the rest of the FP.                                              |
+-----------------------------------------------------------------------+

**(l)** Dosage of admixtures. [Delete the text and substitute the
following:]{.underline}

When requested by the CO, provide a qualified person from the admixture
manufacturer to help establish the proper dosage. Do not mix chemical
admixtures together in a mix unless they are compatible. Furnish
supporting documentation of compatibility from the manufacturers.

> *(1) Air-entraining admixtures.* Entrained air may be obtained with
> either an air-entraining hydraulic cement or an air-entraining
> admixture.
>
> *(2) Set accelerating admixtures.* Do not use chloride accelerators.
> Do not use set accelerating admixtures with class P (prestressed)
> concrete.
>
> *(3) Hydration stabilizing admixtures.* Hydration stabilizing
> admixtures may be used to extend the allowable delivery time for
> concrete. Base the dosage on the time needed to delay the initial set
> of the concrete for delivery and discharge on the job. Include the
> design discharge time limit in the dosage submittal. The maximum
> allowable design discharge time is 3.50 hours.

[Add the following:]{.underline}

Do not use precast units unless included in the plans or approved by the
CO.

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  When a hydration stabilizing admixture may be approved for use, include
  552.08, 552.09, 711.03 **and** the following:

  Include the following with projects with bridge deck concrete, except
  when reasons are noted for excluding high range water reducers:
  (FLHSS).
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**552.08 Delivery.** [Add the following after the second
paragraph:]{.underline}

If a hydration stabilizing admixture is approved for use in the concrete
mix, deliver and place the concrete within the approved design discharge
time limit. Limit the slump loss to no more than 2 inches during the
stabilization period. An approved and compatible hydration activator may
be used at the discharge site to ensure proper placement and testing.

**(a) Truck mixer/agitator**. [Delete Table 552-2 and substitute the
following:]{.underline}

**Table 552-2**

Concrete Discharge Time Limits

+------------------+---------------------------+-----------------------+
| **Cement Type**  | **Admixtures**            | **Time Limit**        |
|                  |                           |                       |
|                  |                           | **(hour)**            |
+------------------+---------------------------+-----------------------+
| Type I, IA, II,  | None                      | 1.00                  |
| or IIA           |                           |                       |
+------------------+---------------------------+-----------------------+
| Type I, IA, II,  | AASHTO M 194, type B, D,  | 1.50                  |
| or IIA           | or G                      |                       |
+------------------+---------------------------+-----------------------+
| Type I, IA, II,  | Hydration stabilizer      | Approved design       |
| or IIA           |                           | discharge time limit, |
|                  |                           | 3.50 maximum          |
+------------------+---------------------------+-----------------------+
| Type III         | None                      | 0.75                  |
+------------------+---------------------------+-----------------------+
| Type III         | AASHTO M 194, type B, D,  | 1.25                  |
|                  | or G                      |                       |
+------------------+---------------------------+-----------------------+

[Add the following:]{.underline}

Concrete discharge times noted in Table 552-2 may be extended to 3 hours
provided an extended set admixture conforming to AASHTO M 194, Type B or
D is incorporated into the plastic concrete at time of mixing. Determine
dosage required to stabilize concrete using job site materials and field
trial mixtures. The extended-set admixture shall provide the following
benefits:

> **(1)** Control the hydration of all cement minerals and gypsum.
>
> **(2)** Control slump loss of the stabilized concrete to within 2
> inches of initial slump after addition of extended set admixture.
>
> **(3)** Provide setting time characteristics measured at the end of
> the stabilization period to within 1 hour of that of the untreated
> concrete mixture.

Include the dosage and type of extended-set admixture with proposed mix
design. When requested, the admixture manufacturer shall provide the
service of a qualified person to assist in establishing the proper dose
of extended-set admixture and make dosage adjustments required to meet
changing job site conditions.

**552.09 Quality Control of Mix.** [Add the following after the first
paragraph:]{.underline}

At least 2 weeks prior to the start of concrete placement operations,
arrange a pre-concrete placing conference. Coordinate attendance with
the CO and any applicable subcontractors. Be prepared to discuss and/or
submit the following:

> **(1)** Proposed concrete placement schedule.
>
> **(2)** Review approved concrete mix design and determination of batch
> weights.
>
> **(3)** Discuss Section 153, Contractor Quality Control, minimum
> frequency schedule for process control sampling and testing (to be
> performed by the Contractor).
>
> **(4)** Discuss batching, mixing, placing, and curing requirements.
>
> **(5)** Discuss Subsections 106.03, Certification, and 106.05,
> Statistical Evaluation of Material for Acceptance.

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  When a hydration stabilizing admixture may be approved for use, include
  552.03, 552.09, 711.03 **and** the following:

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**(a) Mixing.**

> **(7)** [Add the following:]{.underline}
>
> *(l)* If a hydration stabilizing mixture is used, record the slump at
> the plant before adding the stabilizer.

**(b) Delivery and sampling.**

> **(3)** [Add the following after the last paragraph:]{.underline}
>
> If hydration stabilizing admixture is used, determine the slump before
> placement. Reject all concrete with a slump loss of more than 2 inches
> as compared to the slump recorded at the batch plant before adding the
> stabilizer.
>
> **(4)** [Add the following after the last paragraph:]{.underline}
>
> Furnish and maintain curing facilities for compressive cylinders
> meeting the requirements of AASHTO T 23. The facilities shall have
> capacity sufficient to cure 4 cylinders from each compressive strength
> sample set.

**552.12 Construction Joints.** [Delete the third paragraph and
substitute the following:]{.underline}

When the joint is between two fresh concrete placements, rough float the
first placement to thoroughly consolidate the surface and leave the
surface in a roughened condition. Clean the joint surface of laitance,
curing compound, and other foreign material. Use an abrasive blast or
another approved method to expose the aggregate on the joint surface.
Re-tighten forms where the joint overlaps the first placement.
Immediately before placing new concrete, flush the joint surface with
water and allow to dry to a surface dry condition.

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  Include the following when integral concrete coloring is to be used.
  Insert the description of the concrete to be colored and the color
  number in the spaces provided below. Also include the standard SCR for
  subsection 711.05.

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**552.16 Finishing Formed Concrete Surfaces.** [Add the following after
the first paragraph:]{.underline}

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

[Add the following:]{.underline}

**(g) Class 7 - Integral color finish.** All concrete in the shall 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 of Federal Specification 595B.

Prepare five square textured test panels with each panel being 12 inch
square. 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. Complete a Class 1 finish according to (a) above.
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. Prepare and transport the test panels
to the project staging area a minimum of two weeks prior to placing
concrete requiring coloring agent.

**552.19 Acceptance.** [Delete the third sentence of the second
paragraph and substitute the following:]{.underline}

Perform sampling and testing according to Table 552-7.

**Measurement**

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  Include the following when concrete for footing is to be poured against
  disturbed rock.

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**552.20**

[Add the following:]{.underline}

The volume of concrete required, outside the neat lines of the footing,
to pour against undisturbed rock as shown on the plans will not be
measured for payment. When the CO directs the removal of material below
the established elevation of the bottom of the footing, the volume at
concrete required to fill the void will be measured for payment.

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  Include the following when integral concrete coloring is used in the
  concrete.

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[Add the following:]{.underline}

Measure concrete coloring agent by the pound.

**Payment**

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  Include the following when integral concrete coloring is used in the
  concrete.

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**552.21** [Add the following:]{.underline}

**Pay Item Pay Unit**

55222 Concrete coloring agent Pound