96M06/13/07

S725-96M.doc

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  Use on projects as appropriate.

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**Section 725. - MISCELLANEOUS MATERIAL**

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  Include Section 306 and subsection 725.02 with projects requiring dust
  palliatives:

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**725.02 Calcium Chloride and Magnesium Chloride.** [Delete the title
and text and substitute the following:]{.underline}

**725.02 Calcium Chloride, Calcium Chloride Flakes, and Magnesium
Chloride.**

**(a) Calcium chloride liquid.** Conform to AASHTO M 144 type L for the
specified concentration.

**(b) Calcium chloride flakes.** Conform to AASHTO M 144 type S, grade
1,2, or 3, class A.

**(c) Magnesium chloride.** Furnish a brine solution conforming to the
following:

> **(1)** Magnesium chloride by mass 28% minimum
>
> **(2)** Water by mass 72% maximum
>
> **(3)** Specific gravity, AASHTO T 227 1.290 to 1.330

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  When precast concrete units are specified, include the following:

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**725.11 Precast Concrete Units.** [Delete the title and text and
substitute the following:]{.underline}

**725.11 Precast Concrete Units and Accessories.**

**(a) Reinforced concrete manholes sections.** Conform to AASHTO M 199M.

**(b) Concrete barrier.** Conform to ASTM C 825.

**(c) Reinforced concrete crib wall members.** Conform to ASTM C 915.

**(d) Underground concrete utility structures.** Conform to ASTM C 858.

**(e) Concrete water and waste water structures.** Conform to ASTM C
913.

**(f) Solid concrete interlocking paving units.** Conform to ASTM C 936.

**(g) Other precast concrete units not covered by the preceding
requirements.** Cast the units in substantial permanent steel forms.
When reinforcing steel is required, conform to Section 709. Provide
additional reinforcement as necessary for handling the units. Use
concrete conforming to the following:

> **(1)** 28-day strength, AASHTO T 22 25 MPa min.
>
> **(2)** Air content by volume, when required:
>
> *(a)* 9.5 mm max. size aggregate 5% min.
>
> *(b)* \>9.5 mm max. size aggregate 4% min.

Cure the units according to AASHTO M 170M.

Cast a sufficient number of concrete cylinders from each unit or lot of
units to permit compression tests at 7, 14, and 28 days. Make at least 3
cylinders for each test. If the strength requirement is met at 7 or 14
days, the units can be certified for use 14 days from date of casting.

Do not use precast concrete units when:

**(a)** Cylinders that are properly sampled, cast, and cured, do not
meet the strength requirement by an age of 28 days.

**(b)** Cracks, honeycombed, or patched areas are larger than 0.02
square meters.

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  Use when plastic linings are required under subsection 157.10.

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**725.19 Plastic Lining.** [Delete the text and substitute the
following:]{.underline}

Furnish a film or fabric that is serviceable for the duration of the
installation.

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  Include subsection 725.22(f) when neat cement grout is specified

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**725.22 Grout** [Add the following:]{.underline}

**(f) Neat cement grout.** Furnish a grout consisting of a mixture of
cement, water, and admixtures. Do not exceed a water/cement ratio of
0.44. Fly ash, if used, shall not exceed 20% of the cement by weight.
Admixtures to reduce water content, improve the flowability, control
bleeding, or control shrinkage may be added according to the
manufacturer\'s recommendations. Admixtures shall be free of chlorides,
fluorides, sulphites, and nitrates.

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  When fiber reinforced Shotcrete is required, include Section 566,
  subsection 703.18 and the following:

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**725.29 Reinforcing Fibers.** [Add the following:]{.underline}

When reinforcing fibers are specified, conform to the following:

**(a) Use with shotcrete.** Fibers will be deformed steel or fibrillated
polypropylene conforming to ASTM C 1116, Type I or Type III.

**(b) Use with concrete.** Fibers will be fully oriented, 100% virgin
polypropylene, collated fibrillated, white in color, 38 mm long, dosed
at 0.9 kilograms per cubic meter of concrete, conforming to ASTM C 1116,
Type III.