712.1 General Description
This work includes furnishing and placing fiberglass blankets over previously prepared and grassed areas according to the plans or as directed by the Engineer.
712.1.01 Definitions
General Provisions 101 through 150.
712.1.02 Related References
A. Standard Specifications Section 106—Control of Materials Section 700—Grassing Section 822—Emulsified Asphalt B. Referenced Documents General Provisions 101 through 150.
712.1.03 Submittals
Submit certification according to Subsection 106.05 stating that materials conform to the requirements of this Section.
712.2 Materials
A. Fiberglass Mat or Blanket Fiberglass mat is a machine-produced blanket consisting of a uniform layer of continuous, randomly oriented glass fiber strands. Use a mat that is at least 48 in. (1.2 m) wide and weighs the following: • At least 0.2 lbs./yd² (105 g/m²) when used on slopes • At least 0.4 lbs./yd² (215 g/m²) when used in waterways B. Anchoring Staples Use staples made of cold-drawn wire no smaller than 14 gauge (2 mm) in diameter, formed into a U shape with 6 in. (150 mm) long legs and a 1 in. (25 mm) wide crown. C. Asphalt Use asphalt emulsion for tying down the blanket that is grade SS-1h or SS1, conforming to Section 822.
712.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
712.3 Construction Requirements
712.3.01 Personnel
General Provisions 101 through 150.
712.3.02 Equipment
General Provisions 101 through 150.
712.3.03 Preparation
Before placing the fiberglass mat, complete grassing, smooth the area, and clear it of stones, lumps, roots, or other material that would prevent the mat from laying snugly on the underlying soil.
712.3.04 Fabrication
General Provisions 101 through 150.
712.3.05 Construction
A. Placing Mat Place the fiberglass mat or blanket within 24 hours after the area has been planted but before any rain or watering. Place the mat as follows: 1. Dig a 9 in. (225 mm) deep anchor slot across the upgrade end of the site. 2. Place the initial 12 in. (300 mm) of blanket in the anchor slot. 3. Backfill and solidly tamp the slot. 4. Unroll the blanket in the direction of water flow, keeping the blanket in contact with the soil over the entire area. 5. Overlap adjacent strips at least 2 in. (50 mm). Overlap adjoining ends at least 6 in. (150 mm) with the upstream section on top. B. Stapling Drive staples vertically into the ground approximately 1 yd (1 m) apart on each side of the blanket. Drive one row in the center alternately spaced between each side staple. Place the edge staples in the 2 in. (50 mm) overlap. At the end of each mat, place staples in a row spaced approximately 12 in. (300 mm) apart. C. Steep Slopes The Engineer may specify additional staples or check slots in waterways where slopes are steep or large water volumes or velocities are anticipated. D. Asphalt Emulsion The Contractor may apply an asphalt emulsion instead of staples to anchor the blanket. Apply the bituminous material uniformly over the mat at approximately the following rates: • 0.12 gal to 0.15 gal/yd² (0.5 L to 0.7 L/m²) for slopes • 0.24gal to 0.30 gal/yd² (1 L to 1.4 L/m²) or waterways After the emulsified asphalt has broken and becomes tacky, apply a light layer of sand or pulverized soil to the treated areas, if directed by the Engineer. This application prevents the treated area from sticking to anything that contacts it. Do not apply sand or soil in quantities that would damage the newly planted areas.
712.3.06 Quality Acceptance
General Provisions 101 through 150.
712.3.07 Contractor Warranty and Maintenance
Maintain treated areas to the Engineer’s satisfaction until Final Acceptance.
712.4 Measurement
The quantity of fiberglass blanket being paid for is the number of square yards (meters), surface measured, completed and accepted. The 2 in (50 mm) side laps and the blanket in the anchor slot are not included in the measurement but are considered incidental to the work. Treated slopes and treated waterways are measured separately.
712.4.01 Limits
General Provisions 101 through 150.
712.5 Payment
This work will be paid for at the Contract Price per square yard (meter) for fiberglass blanket, complete in place and accepted. Payment is full compensation for furnishing and installing the blanket according to this specification and maintaining the blanket. Preparing the area and grassing will be paid for according to Section 700. Payment will be made under: Item No. 712 Fiberglass blanket, (slopes) Per square yard (meter) Item No. 712 Fiberglass blanket, (waterways) Per square yard (meter)
712.5.01 Adjustments
General Provisions 101 through 150.
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