96M06/12/06

S704-96M.doc

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  When select granular backfill is required, or when MSE walls are
  specified, include the following:

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**Section 704. -- SOIL**

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  When select granular backfill is required, include the following:

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**704.10 Select Granular Backfill.** [Delete the text **but retain Table
704-4**, and substitute the following:]{.underline}

Furnish sound, durable, granular material free from organic matter or
other deleterious material. Conform to the following:

**(a) Quality requirements.**

> **(1)** Gradation Table 704-4
>
> **(2)** Shear maximum angle of internal friction 34^o^ min.
>
> on the portion passing the 4.75 mm sieve,
>
> AASHTO T 236
>
> **Note:** Compact samples for AASHTO T 236 to 95 percent of the
> maximum density determined according to AASHTO T 99 method C or D and
> corrected for oversized material according to AASHTO T 99, Note 7.
>
> **(3)** Sodium sulfate soundness loss (5 cycles), 15% max.
>
> AASHTO T 104
>
> **(4)** Liquid limit, AASHTO T 89 30 max.

**(b) Electrochemical requirements for MSE walls.**

> **(1)** Resistivity, AASHTO T 288 3000 Ω·cm min.
>
> **(2)** pH, AASHTO T 289 5.0 to 10.0
>
> **(3)** Sulfate content, AASHTO T 290 200 ppm max.
>
> **(4)** Chloride content, AASHTO T 291 100 ppm max.
>
> **Note:** Tests for sulfate and chloride content are not required when
> resistivity is greater than 5000 ohm centimeters.

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  Use on all projects with MSE walls

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[Add the following Subsection:]{.underline}

**704.13 Wall fill soils.**

**(a) Select wall backfill.** Furnish sound, durable, granular soil free
from organic matter or other deleterious material (such as shale or
other soft particles with poor durability). Conform to the following:

> **(1) Quality requirements.**
>
> *(a)* Gradation Table 704-6
>
> *(b)* Shear maximum angle of internal friction 34^o^ min.
>
> on the portion passing the 4.75 mm sieve,
>
> AASHTO T 236
>
> **Note:** Compact samples for AASHTO T 236 to 95 percent of the
> maximum density determined according to AASHTO T 99 method C.
>
> *(c)* Sodium sulfate soundness loss (5 cycles) 15% max.
>
> *(d)* Los Angeles abrasion, AASHTO T 96 50% max.
>
> *(e)* Liquid limit, AASHTO T 89 30 max.
>
> *(f)* Plastic index, AASHTO T 90 6 max.
>
> **(2) Electrochemical requirements**
>
> *(a)* Resistivity, AASHTO T 288 3000 Ω-cm min.
>
> *(b)* pH, AASHTO T 289 5.0 to 10.0
>
> *(c)* Sulfate content, AASHTO T 290 200 ppm max.
>
> *(d)* Chloride content, AASHTO T 291 100 ppm max.
>
> **Notes:**
>
> \(1\) Tests for sulfate and chloride content are not required when pH
> is between 6.0 and 8.0 and the resistivity is greater than 5000 ohm
> centimeters.
>
> \(2\) Electrochemical requirements are not applicable to
> geogrid-reinforced walls. Refer to Subsection 720.01(k) for durability
> design requirements.

# Table 704-6

# Select Wall Backfill Gradation

+--------------------------+-------------------------------------------+
| ### Sieve Size           | Percent by Mass Passing Designated Sieve  |
|                          |                                           |
|                          | **(AASHTO T 27 and T 11)**                |
+--------------------------+-------------------------------------------+
| 100 mm                   | 100                                       |
+--------------------------+-------------------------------------------+
| 75 mm                    | 75 -- 100                                 |
+--------------------------+-------------------------------------------+
| 4.75 mm                  | 30 -- 75                                  |
+--------------------------+-------------------------------------------+
| 0.075 mm                 | 0 -- 15                                   |
+--------------------------+-------------------------------------------+

**(b) Wall backfill.** Furnish granular soil free from organic matter or
other deleterious material (such as shale or other soft particles with
poor durability) conforming to AASHTO soil classifications A-1, A-3, or
A-2-4. Remove all rock particles and hard earth clods larger than 300
millimeters in the longest dimension.

**(c) Wall facing fill.** Furnish sound, durable, and pervious granular
soil free from organic matter or other deleterious material (such as
shale or other soft particles with poor durability) conforming to the
following:

> **(1) Quality requirements.**
>
> *(a)* Gradation Table 704-7
>
> *(b)* Sodium sulfate soundness loss (5 cycles) 15% max.
>
> *(c)* Los Angeles abrasion, AASHTO T 96 50% max.

**Table 704-7**

Wall Facing Fill

+--------------------------+-------------------------------------------+
| ## **Sieve Size**        | **Percent by Mass Passing Designated      |
|                          | Sieve**                                   |
|                          |                                           |
|                          | **(AASHTO T 27 and T 11)**                |
+--------------------------+-------------------------------------------+
| 100 mm                   | 100                                       |
+--------------------------+-------------------------------------------+
| 50 mm                    | 0 -- 5                                    |
+--------------------------+-------------------------------------------+