1、Designation: D7986 15Standard Practice forPreparing Specimens of Hydraulic Erosion Control Productsfor Index Property Testing1This standard is issued under the fixed designation D7986; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice specifies a set of instructions for preparingsamples of hydraulic erosion control products
3、 (HECPs) forindex property testing.1.2 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.2.1 For purposes of comparing measured or calculatedvalue(s) with specified limits, the measured or calculatedvalue(s) shall be
4、rounded to the nearest decimal or significantdigits in the specified limits.1.2.2 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as theindustry standard. In addition, they are representative of thesignificant digits that generally should b
5、e measured. Theprocedures used do not consider material variation, purpose forobtaining the data, special purpose studies, or any consider-ations for the users objectives; and it is common practice toincrease or reduce the significant digits of reported data to becommensurate with these consideratio
6、ns. It is beyond the scopeof this standard to consider significant digits used in theanalytical methods for engineering design.1.3 UnitsThe values stated in SI units are being regardedas standard. No other units of measurement are included in thepractice.1.4 This standard does not purport to address
7、 all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D653 Terminology
8、Relating to Soil, Rock, and ContainedFluidsD2216 Test Methods for Laboratory Determination of Water(Moisture) Content of Soil and Rock by MassD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4753 G
9、uide for Evaluating, Selecting, and Specifying Bal-ances and Standard Masses for Use in Soil, Rock, andConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalDataE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3. Terminology3.1 Definitions:3.1.
10、1 For definitions of common technical terms used in thisstandard, refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 Hydraulic Erosion Control Product (HECP), ninerosion control, a manufactured, temporary, degradable, pre-packaged fibrous material that is mixed with w
11、ater andhydraulicallyapplied as a slurry to reduce soil erosion andassist in the establishment and growth of vegetation.3.2.2 index property test, nin erosion control, a standardtest that may be used to compare the relative material proper-ties of erosion control products.4. Summary of Practice4.1 A
12、sample of dry HECPproduct fiber is mixed with waterin an amount corresponding to a field application rate. Theresulting slurry is spread evenly on a metal sheet pan. Thematerial is dried and the resulting sample is removed and cut tosizes appropriate for index property tests.1This test method is und
13、er the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.25.01 on Mulches andTackifiers.Current edition approved Nov. 1, 2015. Published November 2015. DOI:10.1520/D7986-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orco
14、ntact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Significance and U
15、se5.1 This practice is intended to simulate mixing of HECPproducts as would be mixed on a job or project site but in alaboratory environment on a smaller scale. Dried samples arenot necessarily intended to represent a field application ofHECP products but would be representative of the correctamount
16、 of material applied to a known area and provide a basisfor consistent and repeatable index property testing.NOTE 1The quality of the result produced by this standard isdependent on the competence of the personnel performing it, and thesuitability of the equipment and facilities used. Agencies that
17、meet thecriteria of Practice D3740 are generally considered capable of competentand objective testing/sampling/inspection/etc. Users of this standard arecautioned that compliance with Practice D3740 does not in itself assurereliable results. Reliable results depend on many factors; Practice D3740pro
18、vides a means of evaluating some of those factors.6. Apparatus6.1 Baking PanFabricate a stainless steel straight-sided(not tapered), metal baking pan having dimensions of 280 6 5mm by 380 6 5mmby6.56 0.5 mm tall. Retain fabricatedpan for future testing.6.2 Stand MixerA device capable of maintaining
19、a speedbetween 60 and 90 rpm on the low setting and equipped witha 4 L stainless steel mixing bowl with a coated flat beaterattachment.6.3 Drying OvenThermostatically-controlled, preferablyof the forced-draft type, meeting the requirements of Specifi-cation E145 and capable of maintaining a uniform
20、temperatureof 93 6 5C.6.4 BalanceBalances shall conform to the requirements ofSpecification D4753.6.4.1 To determine the mass of the specimen, the balanceshall have readability without estimation of 0.01 g. The capac-ity of this balance will need to exceed the mass of the containerplus a specimen. I
21、n general, a balance with minimum capacityof 600 g is sufficient.6.5 Graduated CylindersTwo cylinders, one graduated for1000 mL and one graduated for 10 mL.6.6 Timing DeviceA clock, stopwatch, digital timer, ordevice readable to one second or better.6.7 Distilled WaterDistilled or demineralized wate
22、r is theonly permissible test fluid. The use of tap water is notpermitted.6.8 Metal PipeA galvanized pipe having a minimumlength of 600 mm and a 25 mm outside diameter.6.9 Miscellaneous ItemsItems such as a large flat solidplastic spatula, scissors or cutting dies, 4 L zip top bags, andnon-stick coo
23、king spray.7. Hazards7.1 Safety HazardsHECP products can be dusty. Eyeprotection and a dust mask are recommended to be worn duringthe procedure.8. Procedure8.1 Obtain a 500 g sample of fiber from the HECP productfrom the middle of the bag or bale. For those products withuneven bag distribution of pr
24、oper chemistry, the manufactureris required to supply the correct amounts of fiber and chemicalsneeded to produce the necessary quantity.8.2 Determine and record the required of amount of fiberusing an application rate of kg/hectare. If the application rate isgiven in lb/acre, then multiply that val
25、ue by 1.12 to getkg/hectare.Then, use the following equation to determine the requiredamount of fiber, F, in grams for use in this procedure.F 5 kg/hectare 3 0.1! 3 A (1)where:F = required amount of fiber, nearest 0.01 g andA = area of the baking pan, nearest 0.001 m2.8.3 Determine and record the qu
26、antity of distilled waterbased on a mixing rate in liters per kilogram (L/kg). Ifnecessary, convert the mixing rate of gallons per pound bymultiplying that value by 8.345 to get L/kg. Then, use thefollowing equation to determine the required quantity ofdistilled water, QDw,inmL.QDw5 M 3 F (2)where:Q
27、Dw= quantity of distilled water, nearest 0.1 mL andM = mixing rate, nearest 1 L/kg.8.4 Determine and record the mass of the mixing bowl tothe nearest 0.01 g and add the quantity of distilled water (QDw)from 8.3 to the bowl. Use both the 10 mL and 1000 mLgraduated cylinders to obtain accurate quantit
28、ies. Place therequired amount of fiber (F) of HECP in the mixing bowl.8.5 Blend the mixture of HECP and distilled water for fiveminutes with the mixer on the low setting to create a slurry.While waiting for the mixture to blend, spray5gofnon-stickcooking spray evenly into the metal baking pan and th
29、en tarethe pan.8.6 After blending for five minutes, remove the bowl fromthe mixer and place the slurry into the metal baking pan. Usethe spatula to make sure that all of the slurry is transferred fromthe bowl to the metal baking pan. Record the pans identifica-tion number on the data sheet.8.7 Using
30、 the 600 mm long metal pipe, roll out the materialin the pan. Start in the middle of the pan and roll each directiontwo times.8.8 Use the plastic spatula to smooth out the slurry in thepan. Make sure there are no lumps and that the HECP is evenlyspread in the pan. Determine and record the mass of th
31、e panplus the slurry to the nearest 0.01 g.8.9 Place the pan with the slurry in the oven for approxi-mately four hours. The final water content shall be 4 6 2%.Since the drying time may vary and to make sure the watercontent is achieved, check the mass of the pan and slurryperiodically throughout th
32、e four hours (see Note 2).D7986 152NOTE 2It is recommended to check the pan and slurry once every twohours.8.10 Once the water content is in the acceptable range,remove the pan and slurry from the oven and allow it to cool.Then, determine and record the mass of the pan and slurry tothe nearest 0.01
33、g. Calculate the water content in accordancewith D2216 and record to the nearest 1 %.8.11 Carefully remove the dried material from the pan usingthe spatula. Then trim the sides of the material with the scissorsor cutting dies to 130 mm long and 100 mm wide allowing forthe creation of six specimens f
34、or index property testing. Otherdimensions and quantities may be needed based on therequirements of subsequent index property testing.8.12 Place the specimens in the zip top bags and properlylabel individual specimens with target field application rate(that is, 2000 - 6000 kg/hectare), mixing rate,
35、supplier nameand product name.8.13 Repeat steps 8.2 through 8.12 until sufficient materialhas been produced in order to obtain the necessary number oftest specimens for subsequent index property testing.9. Report: Test Data Sheet(s)/Form(s)9.1 The methodology used to specify how data are recordedon
36、the test data sheet(s)/form(s), as given below, is covered in1.2 and in Practice D6026.9.2 Record as a minimum the following information (data):9.2.1 Identification of the material being tested, such as theproduct name(s), supplier name, and sample number(s).9.2.2 Date prepared and initials of perso
37、n performing thepreparation.9.3 Record as a minimum the following sample informa-tion:9.3.1 The information associated with determining the wa-ter content and the water content of the material.9.3.2 The amount of fiber, F.9.3.3 The amount of distilled water, QDw.9.3.4 Water to fiber mixing ratio.9.3
38、.5 Field application rate used to create the specimens.10. Keywords10.1 erosion control; HECP; hydraulic; index property test-ing; preparation; samplingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Us
39、ers of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed ever
40、y five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible techni
41、cal committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocke
42、n, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 153
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