1、Designation: E2398/E2398M 15E2398/E2398M 15aStandard Test Method forWater Capture and Media Retention of Geocomposite DrainLayers for Vegetative (Green) Roof Systems1This standard is issued under the fixed designation E2398/E2398M; the number immediately following the designation indicates the yearo
2、f 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 () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the water an
3、d media retention of synthetic drains layers used in vegetative(green) roof systems.1.2 This test method is applicable to geocomposite drain layers that retain water and media in cup-like receptacles on their uppersurface. Examples include shaped plastic membranes and closed-cell plastic foam boards
4、.1.3 This test method does not apply to products manufactured from water-absorptive materials.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used ind
5、ependently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safet
6、y and health practices and to determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C920 Specification for Elastomeric Joint SealantsE631 Terminology of Building ConstructionsE2114 Terminology for Sustainability Relative to the Performance of Bu
7、ildingsE2397 Practice for Determination of Dead Loads and Live Loads Associated with Vegetative (Green) Roof Systems3. Terminology3.1 Definitions:3.1.1 For terms related to building construction, refer to Terminology E631.3.1.2 For terms related to sustainability relative to the performance of build
8、ings, refer to Terminology E2114.3.2 Definitions of Terms Specific to This Standard:3.2.1 captured water, nthe quantity of water that is retained in the drainage layer of a vegetative (green) roof system after newwater additions have ceased and that cannot escape the roof except through evaporation
9、or plant transpiration.3.2.2 coupon, na portion of a material or laboratory sample from which multiple specimens can be taken for testing.3.2.3 geocomposite drain layer, na synthetic sheet, mat, or panel that is specifically designed to convey water horizontallytoward the roof deck drains, gutters,
10、or scuppers.3.2.3.1 DiscussionGeocomposite drainage layers include absorptive drainage mats whose principle function is drainage, but which will also1 This test method is under the jurisdiction of ASTM Committee D08 on Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.24
11、 onSustainability.Current edition approved June 1, 2015Nov. 1, 2015. Published July 2015December 2015. Originally approved in 2005. Last previous edition approved in 20112015 asE2398 11.E2398/E2398M 15. DOI: 10.1520/E2398_E2398M-15.10.1520/E2398_E2398M-15A.2 For referencedASTM standards, visit theAS
12、TM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an in
13、dication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be
14、 considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1contribute to water retention (see retained water). Some geocomposite drainage layers may incorporate receptacles on their uppersurfaces that will captu
15、re water (see captured water).3.2.4 retained water, nthe quantity of water that will be retained for a prolonged period against gravity drainage in a vegetative(green) roof system, or in one of its components, after new additions by rainfall or artificial irrigation have ceased.3.2.4.1 DiscussionMos
16、t of this water will not become runoff but will be used to the plant-mediated processes of evapo-transpiration.3.2.5 unit media retention volume, nthe volume, ft3/ft2 cm3/cm2, that is required to fill a geocomposite drain layer to theupper most asperities of the geocomposite drain layer.3.2.6 unit w
17、ater capture volume, nthe maximum volume of water, ft3/ft2 cm3/cm2, that a geocomposite drain layer can holdat a specified inclination.3.2.6.1 DiscussionFor vegetative (green) roofs systems where the geocomposite drain layer will be filled with granular drainage medium, the actualvolume is assumed t
18、o be 25 % of the measured volume. This assumption will allow a direct comparison between geocompositesheet drains without, regard to the granular drainage media used. In computing the actual water capture of a geocomposite sheetdrain employed in a specific vegetative (green) roof assembly, the poros
19、ity of the granular drainage medium used must beconsidered (Practice E2397).4. Summary of Test Method4.1 This procedure provides a method for measuring the volume of granular media or water, or both, that geocomposite drainlayers can hold. The test involves filling the geocomposite drain layers with
20、 sand and water to establish the respective volumes.Since water capture will be influenced by the inclination of the geocomposite drain layer, the tests are conducted at severalinclinations.5. Significance and Use5.1 Determining these performance characteristics of vegetative (green) roof systems pr
21、ovides information to facilitate theassessment of related engineering aspects of the facility. Such aspects may include structural design requirements, mechanicalengineering and thermal design requirements, and fire and life safety requirements.5.1.1 Accurate information about the water and media ho
22、lding capacity of geocomposite drain layers is essential to predict deadload for vegetative (green) roof systems.5.2 Determining these performance characteristics of vegetative (green) roof systems provides information to facilitateassessment of the performance of one vegetative (green) roof system
23、relative to one another.5.2.1 Water capture is also useful in assessing irrigation requirements for vegetative (green) roof designs.5.2.2 Information about the unit media retention volume is required to predict the quantity of material that will be required toconstruct a vegetative (green) roof with
24、 a specified total thickness.6. Apparatus6.1 Apparatuscontains the following:6.1.1 Scale, accurate to 0.005 oz 0.14 g,6.1.2 Scoop,6.1.3 Water dropper,6.1.4 4-in. 10-cm wide strip of aluminum or copper sheet metal,6.1.5 Latex or silicone caulk, Elastomeric sealant complying with Specification C920, a
25、nd6.1.6 Ruler.7. Conditioning7.1 Cut out a rectangular coupon of the geocomposite drain layer to be tested.7.2 The coupon should contain only complete, intact receptacles. The coupon should contain a minimum of four receptacles andbe at least 6 in. 15 cm square.8. Procedure8.1 Weigh the coupon in a
26、dry condition, and record.E2398/E2398M 15a28.2 With the coupon on a level surface, fill the receptacles with water using a dropper. Excise caution not to moisten other partsof the coupon.8.3 Transfer the coupon to the scale and record the weight of the coupon with the filled receptacles.8.4 Using a
27、ruler, measure the distance between the centers of adjacent receptacles along the width and length of the coupon.NOTE 1This measurement methods assumes that the receptacles are arranged in a rectangular pattern8.5 Repeat the test after filling the coupon on inclined surfaces. The test should be comp
28、leted for the following inclinations:8.5.1 2 degrees (3.5 %),8.5.2 5 degrees (8.7 %),8.5.3 10 degrees (17.6 %), and8.5.4 20 degrees (36.4 %).8.6 Form a fence around the margin of the coupon using the metal strip material. As necessary, seal the edge of the fence usinglatex or silicone caulk. an elas
29、tomeric sealant complying with Specification C920. Allow the caulksealant to cure. Using the ruler,measure the inside dimensions of the fence.8.7 Weigh the system and record.8.8 Fill the geocomposite drain layer with coarse sand until the uppermost asperities are covered. Weigh and record.8.9 Determ
30、ined the unit weight, lb/ft3 kg/m3, of the coarse sand.9. Calculation of Results9.1 Compute the unit media retention volume as follows:Rm5144*Ws/x*y! in.2lb! (1)Rm513106*Ws/x*y! SI!where:Rm = unit media retention volume, ft3/ft2 cm3/cm2,Ws = weight of system filled with sand minus weight of system w
31、ithout sand, lb kg,x = width fence, in. cm,y = length fence, in. cm, and = unit weight of sand, lb/ft3 kgm3.9.2 Compute the unit water capture volume as follows:Rw52.31*Ww !/N *X *Y! in.2lb! (2)Rw 5 13103*Ww ! /N *X *Y! SI!Rf50.25*Rw;where:Rw = unit water capture volume, ft3/ft2 cm3/cm2,Rf = unit wa
32、ter capture volume, when in-filled with media, ft3/ft2 cm3/cm2,Ww = weight of coupon filled with water minus weight of coupon dry, lb kg,N = number of receptacles on the coupon,X = receptacle spacing along the width of the coupon, in. cm, andY = receptacle spacing along the length of the coupon, in.
33、 cm.9.3 Conduct all tests in duplicate. If the results of two tests differ by more than 5 %, then repeat.10. Report10.1 Report the following information:10.1.1 Product designation,10.1.2 Size of the coupon tested,10.1.3 Number of receptacles included on the coupon,10.1.4 Unit media retention volume,
34、 and10.1.5 Unit water capture volume, both Rw and Rf for the five inclinations.11. Precision and Bias11.1 PrecisionThe precision of the procedure for these test methods for measuring the media retention and water capturecapacity of geocomposite drain layers is being determined. Parties interested in
35、 participating in interlaboratory test programsshould contact Committee E60.E2398/E2398M 15a311.2 BiasThe bias for these measurements is undetermined because there are no reference values available for the materialsused.12. Keywords12.1 geocomposite drain layers; media retention; vegetative (green)
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