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Earth Screw Piles |
Direct Piling |
Concrete Foundation |
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Main materials are divided into three categories: Aluminum, Galvanized Stee, Zn-Al-Mg (ZAM).
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Items |
Aluminum Alloy |
Hot-Dip Galvanized Steel (HDG) |
Zinc Aluminum Magnesium (ZAM) |
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Ref. Pics |
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Primary Composition |
Aluminum, with Magnesium, Silicon |
Substrate: Carbon Steel (Q235B etc.) |
Substrate: Carbon Steel |
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Coating: Zinc |
Coating: Alloy of Zinc, Aluminum, Magnesium |
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Corrosion Resistance |
Excellent |
Good |
Superior |
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Forms a protective oxide layer. Resists atmospheric corrosion well. Less performance in highly acidic/alkaline soil or salt-rich environments. |
Zinc coating provides cathodic protection. Good resistance, but protection diminishes quickly if the coating is damaged. |
Offers self healing properties, protecting cut edges and scratches exceptionally well. |
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Strength |
Good |
Good |
Good |
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How to choose for design |
Lower strength than steel. Requires larger cross-sections for highload or highwind applications. |
Very high strength and load-bearing capacity. Ideal for large spans and heavy snow loads. |
Identical strength to HDG steel as it uses the same carbon steel substrate. |
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Weight |
Light Weight |
Heavy |
Heavy |
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It is 1/3 the density of steel. Easy to transport and handle,reducing installation cost,effort and time. |
High density. Heavier, making transportation and installation more labor intensive. |
Same density as steel, so it is equally heavy. |
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Installation |
Easy to Process |
Pre-Drilling Required |
Pre-Drilling Required |
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Cost |
High |
Medium to High |
Medium |
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Higher material cost. Savings can be made in transportation and installation labor due to lightness. |
Lower material and manufacturing cost. Best economics for initial investment. |
It can offer a lower lifetime cost due to minimal maintenance and longer service life. |
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Primary Applications |
Distributed Rooftop like as residential, commercial, coastal areas, weight-sensitive projects. |
Large-Scale Ground-Mounted Power Plants, industrial sheds which are cost-sensitive, high load projects. |
Harsh Environments like as coastal, high humidity, industrial zones, critical infrastructure, projects requiring ultra-long life with low maintenance |
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Structure |
Aluminum |
Galvanized Steel |
ZAM |
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Beam |
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Rails |
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Pillar/ Poster |
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Rear Bracing |
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Types |
Ground Screw |
Direct Piling |
Concrete |
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Foundation |
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