1、Designation: D7986 15D7986 17Standard 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
2、revision, 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 preparing samples of hydraulic erosion control
3、 products (HECPs) for indexproperty testing.1.2 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in PracticeD6026.1.2.1 For purposes of comparing measured or calculated value(s) with specified limits, the measured or calculated value(
4、s) shallbe rounded to the nearest decimal or significant digits 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 the industrystandard. In addition, they are representative of the significant digits that gener
5、ally should be measured. The procedures used donot consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the usersobjectives; and it is common practice to increase or reduce the significant digits of reported data to be commensurate with thes
6、econsiderations. It is beyond the scope of this standard to consider significant digits used in the analytical methods for engineeringdesign.1.3 UnitsThe values stated in SI units are being regarded as standard. No other units of measurement are included in thepractice.1.4 This standard does not pur
7、port 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 safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D653
8、 Terminology Relating to Soil, Rock, and Contained FluidsD2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by MassD3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used inEngineering Design and Con
9、structionD4753 Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and ConstructionMaterials TestingD6026 Practice for Using Significant Digits in Geotechnical DataE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3. Terminology3.1
10、Definitions:3.1.1 For definitions of common technical terms used in this standard, refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:1 This test method is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.25.
11、01 on Mulches andTackifiers.Current edition approved Nov. 1, 2015Feb. 15, 2017. Published November 2015February 2017. Originally approved in 1999. Last previous edition approved in 2015 asD798615. DOI: 10.1520/D7986-15.10.1520/D7986-17.2 For referencedASTM standards, visit theASTM website, www.astm.
12、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 indication of what chan
13、ges 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 considered the offic
14、ial document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 Hydraulic Erosion Control Product (HECP), nin erosion control, a manufactured, temporary, degradable, pre-packagedfibrous material that is mixed with water and hydraul
15、icallyapplied as a slurry to reduce soil erosion and assist in the establishmentand growth of vegetation.3.2.2 index property test, nin erosion control, a standard test that may be used to compare the relative material properties oferosion control products.4. Summary of Practice4.1 Arepresentative s
16、ample of dry HECPproduct fiber is mixed with water in an amount corresponding to a field applicationthedesired mixing rate. The resulting slurry is spread evenly on a metal sheet pan. pan in an amount corresponding to the desired fieldapplication rate. The material is dried and the resulting sample
17、is removed and cut to sizes appropriate for index property tests.5. Significance and Use5.1 This practice is intended to simulate mixing of HECPproducts as would be mixed on a job or project site but in a laboratoryenvironment on a smaller scale. Dried samples are not necessarily intended to represe
18、nt a field application of HECP products butwould be representative of the correct amount of material applied to a known area and provide a basis for consistent and repeatableindex property testing.NOTE 1The quality of the result produced by this standard is dependent on the competence of the personn
19、el performing it, and the suitability of theequipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objectivetesting/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not i
20、n itself assure reliable results. Reliableresults depend on many factors; Practice D3740 provides 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 5 mmby 380 6 5 mm by 6.5 6 0.5
21、 mm tall. Retain fabricated pan for future testing.6.2 Stand MixerA device capable of maintaining a speed between 60 and 90 rpm on the low setting and equipped with a 4L stainless steel mixing bowl with a coated flat beater attachment.6.3 Drying OvenThermostatically-controlled, preferably of the for
22、ced-draft type, meeting the requirements of SpecificationE145 and capable of maintaining a uniform temperature of 93 6 5C.6.4 BalanceBalances shall conform to the requirements of Specification D4753.6.4.1 To determine the mass of the specimen, the balance shall have readability without estimation of
23、 0.01 g. The capacity ofthis balance will need to exceed the mass of the container plus a specimen. In general, a balance with minimum capacity of 600g is sufficient.6.5 Graduated CylindersTwo cylinders, one graduated for 1000 mL and one graduated for 10 mL.6.6 Timing DeviceA clock, stopwatch, digit
24、al timer, or device readable to one second or better.6.7 Distilled WaterTest FluidDistilled or demineralized water is the only permissible test fluid. The use of tap water is notpermitted.6.8 Metal PipeA galvanized pipe having a minimum length of 600 mm and a 25 mm outside diameter.6.9 Miscellaneous
25、 ItemsItems such as a large flat solid plastic spatula, scissors or cutting dies, 4 L zip top bags, and non-stickcooking spray.7. Hazards7.1 Safety HazardsHECP products can be dusty. Eye protection and a dust mask are recommended to be worn during theprocedure.8. Procedure8.1 Obtain a 500 g or suffi
26、cient amount of representative sample of fiber from the HECP product from the middle of the bagor bale. bale to satisfy 8.2. For those products with uneven bag distribution of proper chemistry, the manufacturer is required tosupply the correct amounts of fiber and chemicals needed to produce the nec
27、essary quantity.8.2 Determine and record the required of amount of fiberHECP using an application rate of kg/hectare. If the application rateis given in lb/acre, then multiply that value by 1.12 to get kg/hectare.Then, use the following equation to determine the required amount of fiber,HECP, F, in
28、grams for use in this procedure.F 5kg/hectare 3 0.1!3A (1)where:D7986 172F = required amount of fiber, nearest 0.01 g andF = required amount of HECP, nearest 0.01 g andA = area of the baking pan, nearest 0.001 m2.8.3 Determine and record the quantity of distilled water based on a mixing rate in lite
29、rs per kilogram (L/kg). If necessary,convert the mixing rate of gallons per pound by multiplying that value by 8.345 to get L/kg. Then, use the following equation todetermine the required quantity of distilled water, QDw, in mL.QDw 5M 3F (2)where:QDw = quantity of distilled water, nearest 0.1 mL and
30、M = mixing rate, nearest 1 L/kg.8.4 Determine and record the mass of the mixing bowl to the nearest 0.01 g and add theAdd the quantity of distilled water (QDw)from 8.3 to the mixing bowl. Use both the 10 mLand 1000 mLgraduated cylinders to obtain accurate quantities. Place the requiredamount of fibe
31、rHECP (F) of HECP in the mixing bowl.8.5 Blend the mixture of HECP and distilled water for five minutes with the mixer on the low setting to create a slurry. Whilewaiting for the mixture to blend, spray 5 g of non-stick cooking spray evenly into the metal baking pan and then tare the determinethe we
32、ight of the pan.8.6 After blending for five minutes, remove the bowl from the mixer and place the slurry into the metal baking pan. Use thespatula to make sure that all of the slurry is transferred from the bowl to the metal baking pan. Record the pans identificationnumber on the data sheet.8.7 Usin
33、g As an initial step to spread material, using the 600 mm long metal pipe, roll out the material in the pan. Start in themiddle of the pan and roll each direction two times.8.8 Use the plastic spatula to smooth out the slurry in the pan. pan to a final uniform thickness. Make sure there are no lumps
34、and that the HECP is evenly spread in the pan. Determine and record the mass of the pan plus the slurry to the nearest 0.01 g.8.9 Place the pan with the slurry in the oven for approximately four hours. The final water content shall be 4 6 2 %. Since thedrying time may vary and to make sure the water
35、 content material is achieved,dried, check the mass of the pan and slurryperiodically throughout the four hours until the change in mass of the pan and slurry is less than 1 gram (see Note 2).NOTE 2It is recommended to check the pan and slurry once every two hours.8.10 Once the water content is in t
36、he 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 to the nearest 0.01 g. Calculate the water content in accordance with D2216and record to the nearest 1 %.8.11 Carefully remove the dried material from the pan u
37、sing the spatula. Then trim the sides of the material with the scissorsor cutting dies to a cutting die. Six specimens each measuring 130 mm long and 100 mm wide allowing for the creation of sixspecimens can be created from the sample for index property testing. Other dimensions and quantities may b
38、e needed based onthe requirements of subsequent index property testing.8.12 Place the specimens in the zip top bags and properly label individual specimens with target field application rate (that is,2000 - 6000 kg/hectare), mixing rate, supplier name and product name.8.13 Repeat steps 8.2 through 8
39、.12 until sufficient material has been produced in order to obtain the necessary number of testspecimens for subsequent index property testing.9. Report: Test Data Sheet(s)/Form(s)9.1 The methodology used to specify how data are recorded on the test data sheet(s)/form(s), as given below, is covered
40、in 1.2and in Practice D6026.9.2 Record as a minimum the following information (data):9.2.1 Identification of the material being tested, made into specimens, such as the product name(s), supplier name, and samplenumber(s). If available, record lot number and manufacturing date of material.9.2.2 Date
41、prepared and initials of person performing the preparation.9.3 Record as a minimum the following sample information:9.3.1 The information associated with determining the water content and the water content of the material.9.3.2 The amount of fiber,HECP, F.9.3.3 The amount of distilled water, QDw.9.3
42、.4 Water to fiberHECP mixing ratio.9.3.5 Field application rate used to create the specimens.D7986 17310. Keywords10.1 erosion control; HECP; hydraulic; index property testing; preparation; samplingASTM International takes no position respecting the validity of any patent rights asserted in connecti
43、on with any item mentionedin this standard. Users 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
44、 technical committee and must be reviewed every 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 consid
45、eration at a meeting of theresponsible technical 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 Bar
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