521 ALASKA 2020 SECTION 727 SOIL STABILIZATION M ATERIAL
727-2.01 MULCH. Use one of the following:
1.Wood Cellulose Fiber or Natural Wood Fiber . Processed wood fiber with the following characteristics:
a.Contains no germination- or growth -inhibiting factors.
b.Will remain in un iform suspension in water under agitation and will blend with grass seed, fertilizer and other additives to form a homogeneous slurry.
c.Will form a blotter -like ground cover on application, having moisture absorption and percolation properties and the abil ity to cover and hold grass seed in contact with soil.
d.Dyed a suitable color to facilitate inspection of its placement.
2.Ship the mulch material in packages of uniform weight (plus or minus 5 percent) and bearing the name of the manufacturer and the air -dry weight content.
3.Use a commercial tackifier on all slopes steeper than 2:1. Use the amount recommended by the manufacturer.
4.Dried Peat Moss . Partially decomposed fibrous or cellular stems and leaves of any of several species of Sphagnum mosses with the fol lowing characteristics:
a.Chopped or shredded to allow distribution through normal hydraulic type seeding equipment and capable of being suspended in water to form part of a homogeneous slurry.
b.Free from woody substances and mineral matter such as sulfur or iron and with a pH value of between 4.0 and 6.5.
c.Furnished in an air dry condition and contain less than 35 percent moisture by weight. Have a water holding capacity of not less than 800 percent by weight on an oven dry basis.
d.Non- toxic.
727-2.02 MATTING . Use one of the following:
1.Burlap. Standard weave with a weight of 3.5 to 10 oz/ yd2.
2.Jute Mesh Fabric . Cloth of a uniform, open, plain weave of undyed and unbleached single jute yarn. Use yarn that is loosely twisted and not varying in thickness more than one- half its normal diameter. Furnish jute mesh in rolled strips meeting the following requirements:
a.Width: 45 to 48 inches, ± 1 inch
b.78 warp- ends per width of cloth (minimum)
c.41 weft -ends per yard (minimum)
d.Weight: 20 ounces per linear yard, ± 5%
3.Woven Paper or Sisal Mesh Netting. Woven from twisted yarns available in rolls 45 to 48 inches wide. Mesh may vary from closed to open weave, ranging from 1/8 to 1/4 inch openings. Shrinkage after wetting may not exceed 20 percent of the surface area. 522 ALASKA 2020 4. Knitted S traw Mat . Commercially manufactured erosion control blanket. Use photodegradable netting and biodegradable thread. Use straw and straw products from oats, wheat, rye, or other approved grain crops that are certified weed free of prohibited and restricted noxious weed seed and quarantined pests, according to Alaska Administrative Code, Title 11, Chapter 34 (11 AAC 34), and free of mold, or other objectionable material. When straw or straw products certified according to 11 AAC 34 are not available, use non- certified products manufactured within Alaska before products manufactured in another state, country or territory. Grass, legumes, or any other herbaceous plants produced as hay, shall not be substituted for straw or straw products. May contain coconut or fiber to reinforce the straw. Follow the manufacturer's published recommendations.
5.Woven/Curled Wood Blanket . Machine produced mat of curled wood shavings with a minimum of 80 percent 6- inch or longer fibers, with consistent thickness and the fibers evenly distributed over the entire area of the blanket. Smolder resistant without the use of chemical additives. Cover the top side of the blanket with biodegradable extruded plastic mesh.
727-2.03 STAPLES. U-shaped staples for anchoring matting, approximately 6 inches long and 1
inch wide. Machine- made: No. 11 gage or heavier steel wire. Hand- made: 12- inch lengths of No. 9 gage or heavier steel wire. 523 ALASKA 2020 SECTION 729 GEOSYNTHETICS
729-2.01 Geotextile for Subsurf Ace Drainage, Separa Tion, Stabilization,
EROSION CONT ROL AND EMBANKMENT REINFORCEMENT.
1.Subsurface Drainage. Meet AASHTO M 288 for Subsurface Drainage, except provide a minimum permittivity of 0.50 sec-1, and meet Class 2 Strength Property Requirements.
2.Separation. Meet AASHTO M 288 for Separation, except provide a minimum permittivity of 0.50 sec-1, and meet Class 3 Strength Property Requirements.
3.Stabilization . Meet AASHTO M 288 for Stabilization, except provides a minimum permittivity of 0.50 sec-1, and meet Class 1 Strength Property Requirements.
4.Erosion C ontrol . Meet AASHTO M 288 for Permanent Erosion Control and meet Class 1 Strength Property Requirements.
5.Reinforcement . Meet the requirements in Table 729- 1 for Type 1 or Type 2. Package, label, handle and store geotextile materials according to ASTM D 4873. TABLE 729 -1 GEOTEXTILE REINFORCEMENT PROPERTIES Property Test Method Units Requirementa Type 1 Type 2 Grab Tensile ASTM D4632 lb. 200/200 400/400 Grab Elongation ASTM D4632 % (MD) 10 10 Wide Width Tensile ASTM D4595 lb/in. (ultimate) 200/200 400/400 Wide Width Tensile ASTM D4595 lb/in. (@ 5% strain) 100/100 200/200 Seam Breaking Strength ASTM D4632 lb./in. 180 360 Puncture ASTM D6241 lb. 500 1500 Trapezoidal Tear ASTM D4533 lb. 100 150 AOS ASTM D4751 U.S. sieve size #30b #30b Permittivity ASTM D4491 sec-1 0.20 0.20 Flow Rate ASTM D4491 gal./min./ft2 10 10 a Minimum Average Roll Values (MARV) in machine direction (MD) / cross -machine direction (XD) unless otherwise specified b Maximum average roll value
729-2.02 SILT FENCE. Meet AASHTO M 288 for Temporary Silt Fence.
729-2.03 PAVING FABR IC. Meet AASHTO M 288 for Paving Fabri c.
729-2.04 Geogrid for Embankment and Roadway Stabilization An D
REINFORCEMENT . Provide geogrid consisting of a regular network of connected polymer tensile elements with aperture geometry sufficient to provide significant mechanical interlock with the surrounding material. Provide dimensionally stable geogrid that is able to retain its geometry during construction. Provide geogrid structure that resists ultraviolet degr adation and all forms of chemical and biological degradation encountered in the material in which it is buried. Package, lab el, handle, an d store geog rid material ac cording to ASTM D 487 3.
1.Stabilization . Provide geogrid that meets the survivability require ments in Table 729- 2 and meets the physical requirements in T able 729- 3.
2.Reinforcement . Provide geogrid that meets the survivability requirements in Table 729 -2 and as shown on the Plans.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 549–550 of 584.