ASTM D6918-03

Standard Test Method for Testing Vertical Strip Drains in the Crimped Condition

SCOPE
1.1 This test method is a performance test, which measures the effect crimping, has on the ability of vertical strip drains to transmit water parallel to the plane of the drain.
1.2 This test method is applicable to all vertical strip drains.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jun-2003
• ICS: 91.060.20 - Roofs
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.03 - Permeability and Filtration

Relations

• Replaced By: ASTM D6918-03(2007) - Standard Test Method for Testing Vertical Strip Drains in the Crimped Condition
• Effective Date: 01-Jun-2007
• Referred By: ASTM D6917-16(2022) - Standard Guide for Selection of Test Methods for Prefabricated Vertical Drains (PVD)
• Effective Date: 10-Jun-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6918–03
Standard Test Method for
Testing Vertical Strip Drains in the Crimped Condition
This standard is issued under the fixed designation D 6918; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.1 Avertical strip drain is sealed in a cover of heat shrink
plastic to prevent any water from escaping out through the
1.1 This test method is a performance test, which measures
geotextile during the test.
the effect crimping, has on the ability of vertical strip drains to
4.1.2 Thesealedverticalstripdrainisplacedinthecrimping
transmit water parallel to the plane of the drain.
device (See Fig. 1) and water is allowed to pass through it
1.2 This test method is applicable to all vertical strip drains.
under a constant head of water.
1.3 The values stated in SI units are to be regarded as the
4.1.3 A 90° crimp is placed on the specimen, and water
standard.
allowed to pass through it under a constant head in the crimped
1.4 This standard does not purport to address all of the
condition.
safety concerns, if any, associated with its use. It is the
4.1.4 The flow rate of water along the plane of the un-
responsibility of the user of this standard to establish appro-
crimped vertical strip drain is compared to the flow rate in the
priate safety and health practices and determine the applica-
crimped condition.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 This test method is considered satisfactory for the
2.1 ASTM Standards:
acceptance of commercial shipments of vertical strip drains.
D 4354 Practice for Sampling of Geosyntheics for Testing
5.1.1 In case of dispute arising from differences in reported
D 4439 Terminology for Geosynthetics
test results when using this test method for acceptance testing
3. Terminology of commercial shipments, the purchaser and the supplier
should conduct comparative tests to determine if there is any
3.1 Definitions:
statistical bias between their laboratories. Competent statistical
3.1.1 geocomposite, n—a product composed of two or more
assistance is recommended for the investigation of bias. As a
materials, at least one of which is a geosynthetic.
minimum, the two parties should take a group of test speci-
3.1.2 geosynthetics, n—a planar product manufactured from
mens that as homogenous as possible, and that are from a lot of
polymeric materials used with soil, rock, earth, or other
material of the type in question. The test specimens should be
geotechnical engineering related material as an integral part of
randomly assigned in numbers to each laboratory for testing.
a man-made project, structure, or system.
The average results from the two laboratories should be
3.1.3 geotextile, n—a permeable geosynthetic comprised
compared using Student’s t-test for unpaired data and an
solely of textiles.
acceptable probability level chosen by the two parties before
3.1.3.1 Discussion—Geotextiles perform several functions
the start of testing. If a bias is found, either its cause must be
ingeotechnicalengineeringapplications,including:separation,
found and corrected, or the purchaser and the supplier must
filtration, drainage, reinforcement, and protection.
agree to interpret future test results in light of the known bias.
3.1.4 vertical strip drain, n—ageocompositeconsistingofa
5.2 Vertical strip drains are installed in areas where it is
geotextile cover and drainage core installed vertically into soil
desired to increase the rate of soil consolidation. It has been
to provide drainage for accelerated consolidation of soils.
shown that as the soil around the vertical strip drain consoli-
4. Summary of Test Method
dates, a crimp may form in the vertical strip drain due to the
movement of the drain in the area of soil consolidation.
4.1 This test method describes procedures for determining
5.3 This test method can be used to evaluate if there is any
the effect of a crimp forming in the vertical strip drain due the
reduction in flow rate of water through the drain due to the
consolidation of soils around it in the field.
crimping, and what effect, if any, this crimping may have on
the rate of consolidation of the soil.
This test method is under the jurisdiction of ASTM Committee D35 on
Geosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-
ability and Filtration.
Current edition approved June 10, 2003. Published July 2003.
Annual Book of ASTM Standards, Vol 04.13.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6918–03
6.4 Blow Dryer, used for applying heat to the heat shrink-
wrap that is placed around the test specimen prior to testing.
7. Materials
7.1 Heat Shrink Plastic Wrap—The heat shrink plastic
wrap, of the type used in homes for sealing windows from
wind drafts, is used to seal the vertical strip drain so that water
does not flow out through the geotextile wrap on the core. The
water is to flow in a parallel plan to the fabric, along the core
material of the drain.
7.2 Bathtub Caulk—the caulk is used to seal the test
specimen into the water chamber assembly as directed in 12.2.
8. Hazards
8.1 There are no known hazards either with the materials, or
in performing this test.
9. Sampling, Test Specimens, and Test Units
9.1 Division into Lots and Lot Samples—Divide the mate-
rial into lots and take a lot sample as directed in Practice
FIG. 1 Crimping Wedge
D 4354. Rolls of prefabricated vertical strip drains are the
primary sampling unit.
6. Apparatus
9.2 Laboratory Sample—Remove the outer wrap of drain
material from the roll to avoid sampling and testing any
6.1 The test device must be capable of maintaining a
material, which may have been damaged during storage. Take
constant head of water on the vertical strip drain being tested.
for the laboratory sample a 1830 mm (6 ft) length of the drain
The apparatus consists of a water chamber assembly, a speci-
material.
men holder, and a crimping wedge, all of which are attached to
9.3 Test Specimens—From the laboratory sample taken
a holding stand. See Fig. 2.
from each lot, cut test specimens as directed in 10. Each test
6.2 Container, for collecting the water as it flows through
specimen shall be 610 mm (2 ft) long.
the vertical strip drain.
6.3 Stopwatch or Electronic Timing Device, connected to
10. Number of Specimens
the collection container, for timing the flow of water through
10.1 Unless otherwise agreed upon, as when provided in an
the vertical strip drain.
applicable material specification, take a number of test speci-
mens per laboratory sample such that the user may expect the
95 % probability level that the test result is no more than 5 %
above the average for each laboratory sample.
10.1.1 Reliable Estimate of v—When there is a reliable
estimate of v based upon extensive test records for similar
materials in the user’s labo
...