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FHWA FP-24Public Domain

Section 720 — Structural Wall and Stabilized Embankment Material

Division 700 — Material|PDF pages 873–875

EMBANKMENT MATERIAL

720.01Mechanically- Stabilized Earth Wall Material.

(a)Segmental retaining wall units. Conform to ASTM C1372 and the following:

(1)Net area compressive strength, ASTM C140 4000 psi minimum

(2)Freeze -thaw durability , ASTM C1262 1 percent maximum weight loss after 100 cycles for five of five specimens tested in saline solution or 1.5 percent maximum weight loss after 150 cycles for four of 5 specimens tested in water

(3)Absorption, ASTM C140 5 percent maximum

(4)Height, nominal 8 in

(5)Connection and alignment devices or mechanisms Manufacturer’s recommendations

(b)Wire facing and backing mat. Fabricate from welded wire fabric conforming to AASHTO M 336. Galvanize according to AASHTO M 111, Coating Grade 85.

(c)Clevis connector. Fabricate from welded wire conforming to AASHTO M 336. Galvanize according to AASHTO M 111, Coating Grade 85.

(d)Connector bars. Fabricate from cold -drawn steel wire conforming to AASHTO M 336. Galvanize according to AASHTO M 111, Coating Grade 85.

(e)Fasteners. Provide ½- inch diameter, heavy hexhead bolts, nuts, and washers conforming to ASTM F3125, A563, and F436. Galvanize according to AASHTO M 232.

(f)Hardware cloth. Fabricate with maximum ¼-inch square mesh openings from woven or welded galvanized steel wire fabric conforming to ASTM A740.

(g)Reinforcing mesh. Fabricate from welded wire conforming to AASHTO M 336. Galvanize according to AASHTO M 111, Coating Grade 85.

(h)Reinforcing strips. Fabricate from high -strength, low -alloy structural steel conforming to ASTM A572, Grade 65, Type 3. Galvanize according to AASHTO M 111, Coating Grade 85.

(i)Tie strip. Fabricate from hot -rolled steel conforming to ASTM A1011, Grade 50. Galvanize according to AASHTO M 111, Coating Grade 85.

720.02Gabion and Revet Mattress Material. Fabricate gabion baskets and revet mattresses from either welded wire mesh or twisted wire mesh. Conform to the following:

(a)Welded wire mesh ASTM A974

(b)Twisted wire mesh ASTM A975

Public Domain: FP-24 (FHWA Federal Lands Highway) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.
FP-24 Section 720 — Structural Wall and Stabilized Embankment Material | BuildSpec