Designed

Date

Checked

Approved

Drawn

Drawing No.

Sheet of

File No.

Natu

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Cons

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Serv

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Uni

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Stat

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Agric

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HEAVY USE AREA PROTECTION

CONCRETE & GRAVEL

NOTES:

1. Prepare a smooth, firm foundation prior to placing geotextile and rock courses.

2. Compact the base course and surface aggregate materials with the tracks or wheels of construction equipment.

3. Concrete must be designed to provide a 28-day compressive strength of 4000 psi. All concrete must be 6 inches thick with 2 inches of top cover over the steel. Maintain 3 inch concrete cover of steel along edges.

4. Steel in the floor must be #4 steel reinforcing bars placed both ways, at 15" on center and bar splice a minimum of 15 inches. Steel must be tied securely in place.

5. The recommended minimum distance from water tank or fountain to edge of gravel pad is 8 feet for cattle and 5 feet for smaller animals such as sheep or goats.

6. Use geotextile at all soil-rock interfaces. All four classes of geotextile in Construction Specification IA-95 are acceptable unless the subgrade is very soft. Very soft soil is easily rutted during preparation. The geotextile must meet Class I or IV properties for very soft soil. The subgrade must be prepared without ruts prior to placement of the geotextile.

7. Any geotextile splices must overlap a minimum of 18 inches.

8. Proper subgrade preparation is essential to the long-term performance of the slab. Subgrade shall be uniformly firm, smooth, moist, well-compacted and able to support construction traffic without rutting. Subgrade materials shall be blended, or unsuitable materials removed and replaced as required to obtain uniform materials, moisture and

compaction. Granular or sand base is not a substitute for proper subgrade preparation. Subgrade shall be free of frost, ruts, mud and standing water prior to placement of concrete. Grading tolerances shall be as specified in Construction Specification IA-32.

9. Conversion from Cu.Yd. to Ton is for the convenience of the Contractor. The designquantity is based on volume. The quantity in tons is based on a converstion factor

of 1.5 ton/cu.yd. which may vary with material and source. Check with supplier forrecommended conversion factors.

10. Top of Concrete surface at tank must be higher than surrounding ground to allow for drainage.

11. Recommended minimum distance from water tank or fountain to edge of concrete pad is 2 feet.

L

W

RECTANGULAR PAD

GRAVEL PAD TYPICAL SECTION

CONCRETE PAD TYPICAL SECTION

CIRCULAR PAD

6"

4" Min.

3"

3"

STANDARD DWG. IA-1822

SHEET 1 OF 1DATE: Feb. 2020

NOT TO SCALE

Water Tank

Or Fountain

Slope to drain,4:1 or flatter

Existing Ground

Surface Course

Material

"

Base Course Material

Water Tank

or Fountain

Geotextile at all Soil Rock Interfaces

(See Notes 6 & 7)

Concrete Pad

Gravel Pad

Granular Base, if requiredSee Notes 8 & 9

Concrete Slab#4 Rebar @ 15" C.C.Each way

Reinforced

Concrete Pad

QUANTITY TABLE

Tank Totals

L W Ft.

D Ft.

LC WC Ft.

DC Ft.

Surface Course

Grad.Cu.Yd.

Surface Course Ton*

Base Course

Grad.Cu.Yd.

Base Course Ton*

Geotextile Sq.Yd.

Concrete Cu.Yd.

Granular Base Cu.Yd.

Granular Base Ton*

#4 Rebar Lin.Ft.**

Lc

Wc

"

Surface Thickness

Base Thickness

Options For Surface and Base Courses Design Gradations

OPTION 1

Surface Course-1 12" max. stone size

Example: IDOT Grad. No. 10,11,12a,12b,14 Base Course-3" max. 34" min. stone size

Example: IDOT Grad. No. 13 Macadam Stone

OPTION 2

Surface Course-1 12" max. stone size,

3-10% passing #200 sieveExample: IDOT Grad. No. 12a,12b,14

Base Course-9" max. stone size

Example: IDOT Grad. No. 13 Macadam Stone Base or IDOT Erosion Stone,

6 " nominal, 3" min., 9" max.

Granular Base (required if checked)

* See Note 9 ** Approximately 1.706 lin.ft. steel reinforcement/sq.ft. of concrete. Contractor shall provide steel required to meet the neat lines on the drawings.

DC

(Concrete Diam.)

Water Tank

or FountainD

(Gravel Diam.)

Granular Base,

if required***

See Note 5

See

Note 11

*** Granular base is required if a firm, uniform subgrade cannot be achieved, if

needed for drainage, or for ease of construction. Granular base shall be min. 4" thick meeting all requirements for subgrade listed in Note 8. For most applications, material provided should be dense-graded with less than 16% by weight passing the No. 200 sieve. Suggested gradations are IDOT No. 11 or IDOT No. 14. Extremely wet site conditions may require a larger or cleaner gradation placed between the existing subgrade and base layer. In dry conditions a topping of limestone screenings may facilitate finish grading.

Surface Course Thickness = inches Base Course Thickness = inches

Granular Base Thickness (if needed) = inches

, Sec. , T N, R

County, Iowa

Granular Base, if required***

DATE: April 2020