A06_Specfications__for__sied_concret__block.pdf

1 July 15, 2024

United States Department of the Interior

FISH AND WILDLIFE SERVICE

Upper Mississippi River National Wildlife and Fish Refuge 7071 Riverview Road

Thomson, Illinois 61285

Memorandum

To: JAO Contract Specialist, Renee Babineau From: Savanna District Manager, Ed Britton, UMRNW&FR Date: July 16, 2024

Subject: Details for purchase of flame resistant tied concrete block mat materials – Tarr Marsh Restoration Project

Product: Tied concrete block mat with triple layered underlayment and flame-resistant stabilized interlocking geogrid used for erosion control. (Flexmat or Equal)

Amount of product needed: 17,475 square feet that includes 5 rolls measuring 8’ x 30’ (1,200 square feet total) and 35 rolls measuring 15.5’ x 30’ (16,275 square feet total).

Tied Concrete Block Mat will be composed of four layers meeting the following requirements:

Layer 1 Biaxial Geogrid with Cast Concrete Blocks:

Individual concrete blocks must be tied together with high strength flame resistant bi-axial geogrid to form an erosion control mat. Each concrete block within the mat must be tapered and uniform with dimensions 2.5” in height, 6.5” x 6.5” at bottom, a flat-top pyramid shape, less than 2” spacing between the blocks, and a coarse finish without protrusions. Blocks must meet the minimum compressive strengths shown in Table 1.

Concrete must meet the cement requirements of ASTM C150 and aggregate requirements of ASTM C33. The interlocking geogrid shall be composed of polyester yarns knitted and coated in tension and designed to resist degradation in environments with exposure to water and low pH (<4 pH) and high pH (>9 pH). The geogrid shall then be coated with a flame-resistant synthetic coating with a yellow color (for identification purposes). The geogrid must be securely cast into and embedded within each concrete block to provide the connection strength. Ensure that the geogrid meets the physical requirements found in Table 2.

Layer 2 Woven White Polypropylene Netting:

Woven white polypropylene netting meeting the requirements in Table 3.

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Layer 3 Synthetic Turf Reinforcement Mat (TRM):

TRM will consist of polyester fibers with 80% meeting or exceeding five-inch length.

The TRM shall be of consistent thickness with fibers evenly distributed throughout the entire area of the TRM. The top and bottom of each TRM is covered with heavy duty polypropylene net. Fibers are tightly crimped and curled to allow fiber interlock, and to retain 95% memory of the original shape after loading by hydraulic events. Fibers are required to have a specific gravity greater than 1.0; ensuring the blanket will not float during hydraulic events. TRM must meet the requirements in Table 4.

Layer 4 Wood Excelsior Erosion Control Blanket (ECB):

ECB will consist of seed free curled wood excelsior with 80% six-inch or greater fibers.

It must have consistent thickness with fibers evenly distributed throughout the entire area of the blanket. The top and bottom of each blanket is to be covered with degradable polypropylene netting. ECB must meet the requirements in Table 5.

Delivery and Handling: The mats must be rolled to the specified size and include lifting straps around the tied concrete block mat roll. Upon delivery, rolls or mats will be inspected to ensure that all units are free of defects that may hinder either performance or installation. Missing concrete due to chipping or cracking shall not exceed 15% of the average concrete unit weight. If the threshold of 15% is surpassed the material may be rejected. Repair, patch, or replacement of the affected area should be done per the manufacturer’s recommendation.

Table 1

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Concrete Compressive Strength Requirements Age Required Compressive Strength (psi)

7 - Day 5000 14 – Day 6000 28 - Day 6900

Table 2 Flame Resistant Geogrid Requirements

Property Test Requirement Mass/Unit Area ASTM D5261 10 oz/yd² Aperture Size Measured 2.2 x 2.2 inch

Ultimate Wide Width Tensile Strength (MD x CMD)

ASTM D6637 2600 lb/ft

Elongation at Ultimate Tensile Strength (MD x CMD)

ASTM D6637 12%

Color Visual Yellow (Complies with Standardized Small Scale Flame Test Procedure for the Acceptance of Geogrid Material from Mine Safety and Health Administration, Version ASTP5011 2010-02-12)

Table 3 Polypropylene Netting Requirements

Property Value GSM 118 (-3˜ +3) g/m²

Density 62 x 24 (+/-2) Picks/10cm Warp Strength ≥350 N/5cm

Warp Elongation 20-50% Weft Strength ≥280 N/5cm

Weft Elongation 20-50% Warp Shrinkage ≤7% Weft Shrinkage ≤9%

Table 4

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TRM Requirements Property Test Method Value

Thickness ASTM D6525 0.294 in Light Penetration ASTM D6567 57%

Resiliency ASTM D6524 86% Mass per Unit Area ASTM D6566 0.50 lb/yd²

MD-Tensile Strength Max. ASTM D6818 295.2 lb/ft TD-Tensile strength Max ASTM D6818 194.4 lb/ft

MD-Elongation ASTM D6818 32.2% TD-Elongation ASTM D6818 40.8%

Swell ECTC Procedure 8% Water Absorption ASTM D1117 /ECTC 33.8% Specific Gravity ASTM D792 1.21

UV Stability ASTM D4355 (1,000hr) 80% minimum Porosity Calculated 97.5%

Bench-Scale Rain Splash ECTC Method 2 SLR=5.86 @ 2in/hr ¹,² Bench-Scale Rain Splash ECTC Method 2 SLR=5.00 @ 4in/hr ¹,² Bench-Scale Rain Splash ECTC Method 2 SLR=6.33 @ 6in/hr ¹,²

Bench Scale Shear ECTC Method 3 2.41lb/ft² @ 0.5in soil loss ² Germination Improvement ECTC Method 4 432%

¹ SLR is the Soil Loss Ratio, as reported by NTPEP/AASHTO. ² Bench-scale index values should not be used for design purposes.

Table 5 ECB Requirements

Property Test Method Value Thickness ASTM D6525 0.418 in

Light Penetration ASTM D6567 34.6% Resiliency ASTM D6524 64%

Mass per Unit Area ASTM D6575 0.57 lb/yd² MD-Tensile Strength Max. ASTM D6818 127 lb/ft TD-Tensile strength Max ASTM D6818 50.9 lb/ft

MD-Elongation ASTM D6818 28.64% TD-Elongation ASTM D6818 29.84%

Swell ECTC Procedure 89% Water Absorption ASTM D1117 /ECTC 199%

Bench-Scale Rain Splash ECTC Method 2 SLR=6.84 @ 2in/hr ¹,² Bench-Scale Rain Splash ECTC Method 2 SLR=7.19 @ 4in/hr ¹,² Bench-Scale Rain Splash ECTC Method 2 SLR=7.56 @ 6in/hr ¹,²

Bench Scale Shear ECTC Method 3 2.61lb/ft² @ 0.5in soil loss ² Germination Improvement ECTC Method 4 645%

¹ SLR is the Soil Loss Ratio, as reported by NTPEP/AASHTO. ² Bench-scale index values should not be used for design purposes.