GuanDa GALVANIZED & PVC COATED Gabions

GuanDa GALVANIZED & PVC COATED Gabions

GuanDa GALVANIZED & PVC COATED Gabions are baskets made of Mesh 8 double twisted steel
woven wire mesh, as per ASTM A975-97 (Figs. 1, 2). Gabions
are filled with stones at the project site to form flexible,
permeable, monolithic structures such as retaining walls,
channel linings, and weirs for erosion control projects.
The steel wire used in the manufacture of the gabion is heavily
zinc coated soft temper steel. A PVC coating is then applied to
provide added protection for use in polluted environments
where soils or water are acidic: in salt or fresh water, or
wherever the risk of corrosion is present. The PVC coating has
a nominal thickness of 0.50 mm. The standard specifications of
mesh-wire are shown in Table 2.
The gabion is divided into cells by means of diaphragms
positioned at approximately 1m centers (Fig.1). In order to
reinforce the structure, all mesh panel edges are selvedged
with a wire having a greater diameter (Table 3). Dimensions
and sizes of PVC coated gabions are shown in Table 1.
The material is supplied from an ISO 9001 certified factory.

Wire
All tests on wire must be performed prior to manufacturing the
mesh.
1. Tensile strength: the wire used for the manufacture of
gabions shall have a tensile strength between 350-500
MPa according to EN 10223-3. Wire tolerances (Table 3)
are in accordance with EN10223-3.
2. Elongation: Elongation shall not be less than 10%, in
accordance with EN10016-1 and EN 10016-2.
3. Zinc coating: minimum quantities of zinc shown at Table
3 meet the requirements of EN10244-2 Class A.
4. Adhesion of zinc: the adhesion of the zinc coating to the
wire shall be such that, when the wire is wrapped six turns
around a mandrel having four times the diameter of the
wire, it does not flake or crack when rubbing it with the
bare fingers, in accordance with ASTM A641-97.

P.V.C. (Polyvinyl Chloride) Coating
The technical characteristics and the resistance of the PVC to
ageing meet the relevant standards. The main values for the
PVC material are as follows:
Specific gravity: 1.30-1.35 kg/dm3 in accordance with ASTM
D792 Table 1;
Hardness: between 50 and 60 Shore D, according to ASTM D
2240 –91;
Tensile strength: not less than 20.6 MPa, according to ASTM
D412-92;
Modulus of elasticity: not less than 18.6 MPa, in accordance
with ASTM D412-92;
Abrasion resistance: the percentage of the weight loss shall
be less than 12%, according to ASTM D1242-92.
Creeping corrosion: max. penetration of corrosion of the wire
from a square cut end shall be 1 in. (25 mm) when the
specimen has been immersed for 2,000 hours in a 5% solution
HCl (hydrochloric acid 12 Be).
The accelerated ageing tests are:
Salt spray test: test period 3,000 hours, test method
ASTM B117-94;
Exposure to UV rays: test period 3,000 hours at 145°
F (63°C), test method ASTM D1499-92a and ASTM
G23-93 apparatus Type E;
Brittleness temperature: no higher than 15°F (- 9°C), or lower
temperature when specified by the purchaser, when tested in
accordance with ASTM D746.
The properties after ageing tests shall be as follows:
Appearance of coated mesh: no cracking, stripping or air
bubbles, and no appreciable variation in color;
Specific Gravity: variations shall not exceed 6%;
Hardness: variations shall not exceed 10%;
Tensile strength: variations shall not exceed 25%;
Modulus of elasticity: variations shall not exceed 25%;
Abrasion resistance: variations shall not exceed 10%;
Brittleness temperature: shall not exceed + 64°F (+18° C).

All sizes and dimensions are nominal.
Tolerances of ± 5% of the width, height, and length of the
gabions shall be permitted.

Lacing Operations
Lacing operations can be made by using the tools shown in
Fig.5. Stainless steel rings having the following specification
can be used instead of lacing wire (Fig.4):
Stainless steel rings for PVC coated products
• diameter: 3.05 mm, ASTM A313, Type 302, Class I
• tensile strength: 1530-1745 MPa, ASTM A313-92.
Spacing of the rings must not exceed 200 mm (Fig.3)

 Quotation Request
When requesting a quote, please specify:
• size of units (length x width x height, see Fig.1),
• type of mesh,
• type of coating
EXAMPLE: No. 100 gabions 2x1x1m - Mesh type 8 - Wire diam.
2.7/3.7 mm - Galvanized + PVC coated