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 STANDARD
CELL DIMENSIONS
The individual cells of the standard MiraCell section (MC)
shall be uniform in shape and size when expanded. The cell
dimensions shall be 203 mm long and 244 mm wide. Individual
cells shall have an area of 248cm2.
LARGE CELL DIMENSIONS
The individual cells of the large cell MiraCell section
(MCL) shall be uniform in shape and size when expanded.
The cell dimension shall be 406 mm long and 488 mm wide.
Individual cells shall have an area of 991 cm2.
CELL DEPTHS
The MiraCell section shall have a depth of 200mm, 150mm,
100mm, 75mm or 50mm subject to manufacturing tolerances.
CELL SEAM PEAL STRENGTH TEST
Short term Seam Peel-Strength Test
Cell seam strength shall be uniform over the full depth
of the cell. Short-term peel strength shall be tested per
U.S. Army Corps of Engineers Technical Report GL-86-19 Appendix
A.
Minimum seam peal strengths shall be 2000N for 200mm cell
depth and the strength is directly proportionate to the
cell depth.
 Long
term Seam Hang-Strength Test
Seam hang-strength test shall be performed for a minimum
period of 7 days in a temperature-controlled environment
that undergoes change on a 1 hr. cycle from room temperature
to 54deg C. (130F). Room temperature room temperature to
54deg C. (130F). Room temperature is defined in ASTM E41.
Test samples shall be made by welding of two 100mm wide
polyethylene strips together. A test sample consisting of
two carbon black stabilized strips shall support a 72.5
kg. (160lb) load for the test period.
Alternative Long term Seam Hang-Strength Test
Seam hang-strength test shall be performed for a period
of 30 days at room temperature. Room temperature is defined
in ASTM E41. Test samples shall be made by welding of two
100mm wide polyethylene strips together. A test sample consisting
of two carbon black stabilized strips shall support a 72.5
kg. (160lb) load for the test period.
MIRACELL BASE MATERIAL
Polyethylene used to make strips for MiraCell sections shall
have a density of 0.93 - 0.96 g/cm3 (58.0 - 60.0 lb/ft3).
Polyethylene used to make strips for MiraCell cellular sections
shall have an Environmental Stress Crack Resistance (ESCR)
of 1500 hours. Carbon black content used for ultra-violet
light stabilization shall be 1.5% - 2.0% by weight. The
Carbon black shall be homogeneously distributed throughout
the material.
SMOOTH STRIP / CELL
Strips used to make MiraCell cellular confinement sections
shall have a thickness of 1.2mm ± 5% The polyethylene
strips shall be uniform and essentially smooth. Sheet extrusion
can cause some areas of blemish which do not hinder the
performance.
ASSEMBLY
MiraCell standard cellular sections (MC) shall be fabricated
using strips of sheet polyethylene each having a length
of 3.35m and a width equal to the cell depth. Adjoining
strips shall be connected using uniformly spaced, full depth,
ultrasonic spot welds. Welds shall be off-set and aligned
perpendicular to the longitudinal axis of the strip. Weld
spacing shall be 330mm ± 2.5mm. The ultrasonic weld
melt pool shall not exceed 25mm.
203 mm Maximum of 30 cells 244 mm DIRECTION OF EXPANSION
Always 2.44m MiraCell large cell cellular sections (MCL)
shall be fabricated using strips of sheet polyethylene each
having a length of 3.35m and a width equal to the cell depth.
Adjoining strips shall be connected using uniformly spaced,
full depth, ultrasonic spot welds. Welds shall be off-set
and aligned perpendicular to the longitudinal axis of the
strip. Weld spacing shall be 660mm ± 2.5mm. The ultrasonic
weld melt pool shall not exceed.
SECTION PROPERTIES
Standard MiraCell Section
MiraCell standard section dimensions shall be as indicated
in fig. 3. Sections shall have a nomenclature of "MC-D-XX"
where "MC" indicates a MiraCell standard cell;
"D" indicates the cell depth in mm and; "XX"
indicated the expanded length in number of cells. An example
of MiraCell Standard section nomenclature is MC-150-30 where
the section cell depth is 150mm and the length over its
30 cells is 6.1 m
Section |
Length (m) |
Width (m) |
Area (m2) |
Weight (kg) |
MC-050-30 |
6.1 |
2.44 |
14.86 |
12.3 |
MC-075-30 |
6.1 |
2.44 |
14.86 |
18.5 |
MC-100-30 |
6.1 |
2.44 |
14.86 |
24.7 |
MC-150-30 |
6.1 |
2.44 |
14.86 |
37.0 |
MC-200-30 |
6.1 |
2.44 |
14.86 |
43.9 |
SECTION PROPERTIES
Large Cell MiraCell Section
MiraCell large section dimensions shall be as indicated
in fig. 4. Sections shall have a nomenclature of "MCL-D-XX"
where "MCL" indicates a MiraCell large cell; "D"
indicates the cell depth in mm and "XX" indicated
the expanded length in number of cells. An example of MiraCell
Large section nomenclature is MCL-150-30 where the section
cell depth is 150mm and the length over its 30 cells is
12.19 m
Section |
Length (m) |
Width (m) |
Area (m2) |
Weight (kg) |
MC-050-30 |
12.19 |
2.44 |
27.74 |
12.3 |
MC-075-30 |
12.19 |
2.44 |
27.74 |
18.5 |
MC-100-30 |
12.19 |
2.44 |
27.74 |
24.7 |
MC-150-30 |
12.19 |
2.44 |
27.74 |
37.0 |
MC-200-30 |
12.19 |
2.44 |
27.74 |
43.9 |
MIRACELL SECTIONS ANCHORING COMPONENTS
Length and diameter vary
MiraCell sections, with or without tendons, shall be anchored
with stake anchors as detailed in construction drawings.
Rows of stake anchors shall either be engaged and/or bear
against the cell walls or engaged and held by integral tendons
against the foundation soil. The size, type and distribution
of stake anchors shall be as shown in the construction drawings.
Steel J-Pin Stakes.
Steel J-Pin Stakes shall be fabricated from mild steel
reinforcement bars. Each stake shall have a minimum
radius, 180 degree return at one end. Rod diameter shall
be 10mm, 12mm 16mm or 20mm. Stake length shall be according
to the construction drawings and ground conditions.
Galvanizing if specified shall be in accordance to AASHTO
M-218. |
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