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HDPE SILICON CORE PIPES
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GEOSYNTHETICS / Geogrid / Uniaxial Geogrid
 
Наименование: Uniaxial Geogrid
Описание: 

UNIAXIAL GEOGRIDS

1.                   The reinforcing element shall be an integral, rigid geogrid manufactured from high density polyethylene polymer. The junctions between the longitudinal ribs and the transversal bars shall be an integral part of the geogrid structure and shall under no circumstances be obtained by weaving, knitting or bonding single threads or other tensile elements.
 
2.                   The geogrid rolls shall be identified in accordance with ISO 10320 Standard and manufactured in accordance with ISO 9001 Quality Assurance System. The reinforcing element shall be certified “CE MARKING” in accordance with the requirements of EN 13249, EN 13251, EN 13254, EN 13257 (Characteristics required for use in earthworks, foundations and retaining structures).
 
3.                   The geogrids shall have an endorsement certificate issued by a European notified body on the performance of the soil reinforced system that declares its suitability for use as a tensional reinforcement element for slopes and walls with a design life up to 120 years. 
 
4.                   The approved geogrid reinforced slope system shall have an independent certificate stating its resistance to impact loads in excess of 4500 kJ based upon actual full scale instrumented testing.
 
5.                   The geogrids shall comply in full with the following specification:
 
 

TECHNICAL CHARACTERISTICS
TEST METHOD
UNIT
TYPE U1
TYPE U2
TYPE U3
TYPE U4
TYPE U5
NOTES
Mass per Unit Area
ISO 9864
g/m²
300
400
600
800
1000
Mean
Strength at 2% Strain
ISO 10319
kN/m
11
17
26
36
45
min
Strength at 5% Strain
ISO 10319
kN/m
25
32
50
72
90
min
Peak Tensile Strength
ISO 10319
kN/m
45
60
90
120
160
min
Yield Point Elongation
ISO 10319
%
11.5
13
13
13
13
Mean
Junction Strength
GRI-GG2
kN/m
36
50
80
110
130
min
Creep Rupture Design Strength
at 20°C at 120 Years
ISO 13431
kN/m
21.2
28.3
42.4
56.5
75.4
min

 
 
6.                   The manufacturer’s material extrapolation factor for creep shall be based upon 10 years of continuous creep testing on the same or similar geogrid. Manufacturers unable to supply a long term creep data test report shall use a default extrapolation factor of 2.0 in accordance with Annex A of BS8006:85. Manufacturers claiming equivalency using other manufacturers’ product test data shall not be approved.
 
7.                   The material factor for installation damage shall be not greater than 1.07 when tested in an independent full scale test using sharp aggregate with a maximum particle size of 125 mm. Compaction will be in accordance with Table 6/4 of the Specification for Highway Works (MCHW 1) for Class 6I material. Manufacturers unable to supply an independent test report shall use a default factor of safety of 1.85. Manufacturers claiming equivalency using other manufacturers’ product test data shall not be approved.
8.                   The reinforcing element shall be inert to all chemicals naturally found in soils and shall have no solvents at ambient temperature. It shall not be susceptible to hydrolysis, shall be resistant to aqueous solutions of salts, acids and alkalis, shall be non-biodegradable and shall have a suitable content of carbon black to inhibit attack by ultra violet light. The minimum Reduction Factor for Durability/Aging for HDPE geogrid shall be 1.0.
 
9.                   The minimum reduction factors for PET geogrids (as recommended by the US FHWA-NHI-00-043) are as follows: 1.15 for soils having a pH ranging between 5<pH<8 and 1.3 for pH values 3£pH£5 and 8£Ph£9. In any case, PET geogrids shall not be used with modified soils including lime or cement stabilized soils, PFA fill materials, saline soils, in marine environments or in the proximity of concrete elements, and any soils with pH<3 and pH>9.
 
10.               An approved supplier is CHINA BAOLI GROUP, or their designated representative.
 
11.               The submittal packages for alternate geogrid materials must include:
 
a)             A list of 10 comparable projects that are similar in terms of size and application, and where the results of using the specific alternate geogrid material can be verified after a minimum of 3 years of service life.
b)             A sample of alternate geogrid material and independent certified specification sheets.
c)             A verified design, including drawings and calculations, prepared by a Registered Professional Civil Engineer using the material reduction factors described above.
 
 
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