Part 1 — General
1.1 Section Includes
A.Rock filled gabions and revet mattresses.
1.2 Related Sections
A.Section 02075: Geotextiles
B.Section 02317: Structural Excavation and Backfill
1.3 References
A.AASHTO T 85: Specific Gravity and Absorption of Coarse Aggregate
B.AASHTO T 96: Resistance to Degradation of Small-Size Course Aggregate by Abrasion and Impact in the Los Angeles Machine
C.AASHTO T 104: Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate
D.ASTM A 975: Double–Twisted Hexagonal Mesh Gabions and Revet Mattresses (Metallic-Coated Steel Wire or Metallic-Coated Steel Wire With Poly (Vinyl Chloride) (PVC) Coating)
E.ASTM D 7014: Assembly and Placement of Double-Twisted Wire Mesh
1.4 Definitions
A.Gabion – A double-twisted wire mesh enclosure uniformly partitioned into internal cells, interconnected with other similar units, and filled with rock to form flexible, permeable, monolithic structures.
B.Revet mattress – Similar to gabions but having a larger footprint and smaller height.
C.Rock diameter - The equivalent diameter (average width) of a given rock.
1.5 Submittals
A.Wire enclosure manufacturer’s product data sheet and installation instructions, for information.
1.Conform to ASTM D 7014 for installation instructions.
B.The rock source, gradation, and laboratory values for the properties in Table 1, for information.
Part 2 — Products
2.1 Gabions and Revet Mattresses
A.Wire enclosure
1.Gabion
a.Galvanized 8 x 10 wire mesh type, mesh opening 3.25 inch nominal x 4.50 inch nominal. Refer to ASTM A 975
b.PVC coated galvanized 8 x 10 wire mesh type, mesh opening 3.25 inch nominal x 4.50 inch nominal. Refer to ASTM A 975.
2.Revet mattress
a.Galvanized 6 x 8 wire mesh type, mesh opening 2.50 inch nominal x 3.25 inch nominal. Refer to ASTM A 975.
b.PVC coated galvanized 6 x 8 wire mesh type, mesh opening
2.50 inch nominal x 3.25 inch nominal. Refer to ASTM A
975.
B.Rock
1.Hard, durable, resistant to weathering, and free from seams, cracks and other structural defects.
a.Do not use shale, mudstone, and other rock that may break into smaller pieces during handling.
b.Do not use concrete or asphalt rubble.
2.Meet the properties listed in Table 1. Table 1 Physical Properties Property Value Test Method Specific Gravity 2.4 min AASHTO T 85 Absorption 2% max AASHTO T 85 Soundness of Aggregate using Sodium Sulfate 12% max AASHTO T 104 or or Magnesium Sulfate 17.5% max Resistance to Degradation 45% max AASHTO T 96
3.Provide rock diameters between 4 to 8 inches or as shown.
4.Retain 95 percent or more of the rock on a square screen having the same opening size as the wire enclosure.
a.Control gradation by sample measurement or by visual inspection, as determined by the Engineer.
2.2 Erosion Control Geotextile
A.Refer to Section 02075, except use a nonwoven 12 oz/yd2 maximum average roll value.
Part 3 — Execution
3.1 Preparation
A.Excavate and grade to provide a firm and uniform bearing surface. Refer to Section 02317.
B.Install erosion control geotextile as shown.
3.2 Gabion and Revet Mattress Installation
A.Follow manufacturer’s installation instructions.
B.Place each empty wire enclosure into its final position as shown.
1.Tie or fasten to adjacent wire enclosures along all containing edges in order to form a continuously connected, monolithic structural unit.
C.Place rock into the wire enclosure in a manner that ensures proper alignment, minimizes voids, avoids bulges, and prevents damage to the wire enclosure.
1.Hand place rock on exposed vertical faces as necessary to develop a satisfactory face graduation and prevent loss of smaller rock fill through the openings.
Gabions And Revet Mattresses in other states
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Source: Utah Standard Specifications for Road and Bridge Construction, 2027 Edition. Pages 316–319 of 1,343. View official source ↗