ASTM C173 C173M-2010 Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method《使用体积法测定新拌混凝土中含气量的标准试验方法》.pdf
《ASTM C173 C173M-2010 Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method《使用体积法测定新拌混凝土中含气量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C173 C173M-2010 Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method《使用体积法测定新拌混凝土中含气量的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C173/C173M 10Standard Test Method forAir Content of Freshly Mixed Concrete by the VolumetricMethod1This standard is issued under the fixed designation C173/C173M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the yea
2、r 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This test method covers determi
3、nation of the air contentof freshly mixed concrete containing any type of aggregate,whether it be dense, cellular, or lightweight.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The SI units areshown in brackets. The values stated in each system
4、 may not beexact equivalents; therefore, each system shall be used inde-pendently of the other. Combining values from the two systemsmay result in non-conformance with the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresp
5、onsibility 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.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2. R
6、eferenced Documents2.1 ASTM Standards:3C29/C29M Test Method for Bulk Density (“Unit Weight”)and Voids in AggregateC31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC138/C138M Test Method for Density (Unit Weight),Yield, and Air Content (Gravimetric) of ConcreteC143/C143M Tes
7、t Method for Slump of Hydraulic-CementConcreteC172 Practice for Sampling Freshly Mixed ConcreteC173/C173M Test Method for Air Content of FreshlyMixed Concrete by the Volumetric MethodC231 Test Method for Air Content of Freshly Mixed Con-crete by the Pressure MethodC670 Practice for Preparing Precisi
8、on and Bias Statementsfor Test Methods for Construction Materials3. Significance and Use3.1 This test method covers the determination of the aircontent of freshly mixed concrete. It measures the air containedin the mortar fraction of the concrete, but is not affected by airthat may be present inside
9、 porous aggregate particles.3.1.1 Therefore, this is the appropriate test to determine theair content of concretes containing lightweight aggregates,air-cooled slag, and highly porous or vesicular natural aggre-gates.3.2 This test method requires the addition of sufficientisopropyl alcohol, when the
10、 meter is initially being filled withwater, so that after the first or subsequent rollings little or nofoam collects in the neck of the top section of the meter. Ifmore foam is present than that equivalent to 2 % air above thewater level, the test is declared invalid and must be repeatedusing a larg
11、er quantity of alcohol. Addition of alcohol to dispelfoam any time after the initial filling of the meter to the zeromark is not permitted.3.3 The air content of hardened concrete may be eitherhigher or lower than that determined by this test method. Thisdepends upon the methods and amounts of conso
12、lidation effortapplied to the concrete from which the hardened concretespecimen is taken; uniformity and stability of the air bubbles inthe fresh and hardened concrete; accuracy of the microscopicexamination, if used; time of comparison; environmentalexposure; stage in the delivery, placement and co
13、nsolidationprocesses at which the air content of the unhardened concreteis determined, that is, before or after the concrete goes througha pump; and other factors.4. Apparatus4.1 Air MeterAn air meter consisting of a bowl and a topsection (Fig. 1) conforming to the following requirements:1This test
14、method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.60 on Testing Fresh Concrete.Current edition approved Feb. 1, 2010. Published March 2010. Originallyapproved in 1942. Last previous edition approved in 2009 a
15、s C173/C173M09 DOI:10.1520/C0173_C0173M-102Section on Safety Precautions, Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards, Vol 04.02.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
16、MStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.1 The bowl and top s
17、ections shall be of sufficientthickness and rigidity to withstand rough field use. Thematerial shall not be attacked by high pH cement paste, deformwhen stored at high temperatures in closed spaces, or becomebrittle or crack at low temperatures. A watertight seal must beobtained when the top section
18、 is attached to the bowl.4.1.2 BowlThe bowl shall have a diameter equal to 1 to1.25 times the height and be constructed with a flange at ornear the top surface. Bowls shall not have a capacity of lessthan 0.075 ft32.0 L.4.1.3 Top SectionThe top section shall have a capacity atleast 20 % larger than
19、the bowl and shall be equipped with aflexible gasket and a device to attach the top section to thebowl. The top section shall be equipped with a transparentscale, graduated in increments not greater than 0.5 % from 0 atthe top to 9 %, or more, of the volume of the bowl. Graduationsshall be accurate
20、to 60.1 % by volume of the bowl. The upperend of the neck shall have a watertight cap that will maintaina watertight seal when the meter is inverted and rolled.4.2 FunnelA funnel with a spout of a size permitting it tobe inserted through the neck of the top section and long enoughto extend to a poin
21、t just above the bottom of the top section.The discharge end of the spout shall be so constructed thatwhen water is added to the container there will be a minimumdisturbance of the concrete.4.3 Tamping RodA round, straight steel, high-densitypolyethylene, or other plastic rod of equal or greater abr
22、asionresistance with a58 in. 16 m 6116 in. 2 mm diameter. Thelength of the tamping rod shall be at least 4 in. 100 mmgreater than the depth of the bowl in which rodding is beingperformed, but not greater than 24 in. 600 mm in overalllength (Note 1). The length tolerance for the tamping rod shallbe 6
23、18 in. 4 mm. The rod shall have the tamping end or bothends rounded to a hemispherical tip of the same diameter as therod.NOTE 1A rod length of 16 in. 400 mm to 24 in. 600 mm meets therequirements of the following: Practice C31/C31M, Test Method C138/C138M, Test Method C143/C143M, Test Method C173/C
24、173M, and TestMethod C231.4.4 Strike-off BarA flat, straight steel bar at least18 by34by 12 in. 3 by 20 by 300 mm or a flat, straight high-densitypolyethylene bar, or other plastic of equal or greater abrasionresistance, at least14 by34 by 12 in. 6 by 20 by 300 mm.4.5 Calibrated CupA metal or plasti
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