1712 – PRE-FABRICATED VERTICAL DRAIN 1700-21
1712.1 Description
This specification covers the requirement s for prefabricated vertical drains.
1712.2 Requirements
Provide a prefabricated polypropylene channeled core wrapped in a non-woven polypropylene continuous filament geotextile complying with the minimum, minimum average roll values in TABLES 1712-1 and 1712-2. TABLE 1712-1: PREFABRICATED VERTICAL DRAIN FABRIC, MINIMUM AVERAGE ROLL VALUES Property Requirement Test Method Grab Tensile Strength 130 lbs ASTM D4632 Grab Elongation at Failure > 50% ASTM D4632 Trapezoidal Tear 60 lbs ASTM D4533 Permittivity 0.5 sec -1 ASTM D4491 Apparent Opening Size (AOS) ≤ 0.3 mm ASTM D4751 TABLE 1712-2: PREFABRICATED VERTICAL DRAIN COMPOSITE, MINIMUM AVERAGE ROLL VALUES Discharge Capacity Re quirement Test Method 1.5 gpm 1.5 psi ASTM D4716 1.5 gpm 43.5 psi ASTM D4716
1712.3 Test Methods
Test in accordance with the requirements stated in subsection 1712.2.
1712.4 Prequalification
None required.
1712.5 Basis of Acceptance
The Engineer will accept the geosynthetic material upon the basis of satisfactory test results for each lot. A lot is defined as 10,000 feet. If the material fails to comply with the requirements, the entire lot will be rejected. Any geosynthetic material proposed for use must be evaluated by the Bureau of Structures and Geotechnical Services, Geotechni cal Unit, Soils Section. The entire lot of geosynthetic material must be on site before samples are taken and laboratory testing performed. Allow a minimum of 15 working days for the approval process. After sufficient data has been collected, the testing frequency may be modified upon approval by the Chief Geotechnical Engineer.
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