ASTM D4944-2018 Standard Test Method for Field Determination of Water (Moisture) Content of Soil by the Calcium Carbide Gas Pressure Tester《用电石气体压力测试仪现场测定土壤含水量的标准试验方法》.pdf
《ASTM D4944-2018 Standard Test Method for Field Determination of Water (Moisture) Content of Soil by the Calcium Carbide Gas Pressure Tester《用电石气体压力测试仪现场测定土壤含水量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4944-2018 Standard Test Method for Field Determination of Water (Moisture) Content of Soil by the Calcium Carbide Gas Pressure Tester《用电石气体压力测试仪现场测定土壤含水量的标准试验方法》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4944 11D4944 18Standard Test Method forField Determination of Water (Moisture) Content of Soil bythe Calcium Carbide Gas Pressure Tester1This standard is issued under the fixed designation D4944; the number immediately following the designation indicates the year oforiginal adoption or
2、, in the case of 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. Scope*1.1 This test method outlines procedures for determining the water (moisture) cont
3、ent of soil by chemical reaction using calciumcarbide as a reagent to react with the available water in the soil producing a gas. A measurement is made of the gas pressureproduced when a specified mass of wet or moist soil is placed in a testing device with an appropriate volume of reagent and mixed
4、.1.2 This test method is not intended as a replacement for Test Method D2216; but as a supplement when rapid results arerequired, when testing is done in field locations, or where an oven is not practical for use. Test Method D2216 is to be used asthe test method to compare for accuracy checks and c
5、orrection.1.3 This test method is applicable for most soils. Calcium carbide, used as a reagent, reacts with water as it is mixed with thesoil by shaking and agitating with the aid of steel balls in the apparatus. To produce accurate results, the reagent must react withall the water which is not che
6、mically hydrated with soil minerals or compounds in the soil. Some highly plastic clay soils or othersoils not friable enough to break up may not produce representative results because some of the water may be trapped inside soilclods or clumps which cannot come in contact with the reagent. There ma
7、y be some soils containing certain compounds orchemicals that will react unpredictably with the reagent and give erroneous results. Any such problem will become evident ascalibration or check tests with Test Method D2216 are made. Some soils containing compounds or minerals that dehydrate withheat (
8、such as gypsum) which are to have special temperature control with Test Method D2216 may not be affected (dehydrated)in this test method.1.4 This test method is limited to using calcium carbide moisture test equipment made for 20 g, or larger, soil specimens andto testing soil which contains particl
9、es no larger than the No. 4 4.75 mm (No. 4) Standard sieve size.1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this Theinch-pound units given in parentheses are mathematical conversions, which are provided for information purposes only
10、 and arenot considered standard.1.5.1 Cited sieve sizes are the standard sieve sizes given in Table 1 of Specification E11.1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in PracticeD6026 unless superseded by this standard.1.6.1
11、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 generally should be retained. The procedures used do notconsider material variation, purpose for obt
12、aining the data, special purpose studies, or any considerations for the users objectives;it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It isbeyond the scope of this standard to consider significant digits used in analyti
13、cal methods for engineering design.1.7 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 safety safety, health, and healthenvironmental practices and determine theapplic
14、ability of regulatory limitations prior to use. For specific hazards statements, see Section 7.1.8 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Stand
15、ards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.1 This test method is under the jurisdiction ofASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.08 on Special and ConstructionControl Tests.Curre
16、nt edition approved Nov. 1, 2011Feb. 15, 2018. Published December 2011February 2018. Originally approved in 1989. Last previous edition approved in 20042011as D4944 04.11. DOI: 10.1520/D4944-11.10.1520/D4944-18.This document is not an ASTM standard and is intended only to provide the user of an ASTM
17、 standard an indication 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 b
18、y ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12. Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to
19、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 ConstructionD4753 Guide for
20、Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and ConstructionMaterials TestingD6026 Practice for Using Significant Digits in Geotechnical DataE11 Specification for Woven Wire Test Sieve Cloth and Test SievesE177 Practice for Use of the Terms Precision and
21、 Bias in ASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. Terminology3.1 DefinitionsDefinitions:3.1.1 Definitions of terms used in this test method can be found in Terminology D653.4. Summary of Test Method4.1 A measured volume of c
22、alcium carbide, in excess of that needed to react with the water, is placed in the testing apparatusalong with two steel balls and a representative specimen of soil having all particles smaller than the No. 4 4.75 mm (No. 4) sievesize and having a mass equal to that specified by the manufacturer of
23、the instrument or equipment. The apparatus is shakenvigorously in a rotating motion so the calcium carbide reagent can contact all the available water in the soil. Acetylene gas isproduced proportionally to the amount of available water present. The apparent water content is read from a pressure gau
24、ge onthe apparatus calibrated to read in percent water content for the mass of soil specified.4.2 Acalibration curve is developed for each instrument and each soil type by plotting the pressure gauge reading and the watercontent determined from Test Method D2216 using representative specimens of the
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