1、C567/C567M-11approached at about 90 days.For most high-strength lightweight con-condition on the seventh day after molding and immerse incretes,equilibrium density is approached at about 180 days.Extensivewater at 23+2 C 73.5 3.5 Ffor 24 h.Measure thetests demonstrate that despite variations in the
2、initial moisture content ofapparent mass of the cylinders while suspended and completelylightweight aggregate,the equilibrium density will be approximately 50kg/m 3.0 Ib/ftgreater than the oven-dry density.submerged in water and record as C,the mass of thesuspended-immersed cylinder.Remove from the
3、water and6.Apparatusallow to drain for I min by placing the cylinder on a 9.5-mm6.1 Tamping Rod,Mallet,Measure,Balance,and Molds-%-in.or coarser sieve cloth.Remove visible water with aThese shall conform to the requirements of Test Methoddamp cloth,determine the mass and record as B.the mass ofC138/
4、C138M and Specification C470/C470M.the saturated-surface-dry cylinder.Dry the cylinders with all6.1.1 Measure-A 14-L 0.5-ftmeasure shall be the stan-surfaces exposed,in a controlled humidity enclosure as de-dard(see Note 3).scribed in 6.2 until the mass of the specimen changes not more6.2 Controlled
5、 Humidity Enclosure-A room controlled atthan 0.5%(gain or loss)in successive determinations of mass505%relative humidity and232oC73.53 For a28 days apart.Determine the mass of the dried cylinders andsmall chamber meeting the requirements of Practice E104.record as A.the mass of the dried cylinder.Ca
6、lculate the6.3 Drying Oven-An oven of appropriate size capable ofequilibrium density of the concrete from Eq 1 and 2.maintaining a uniform temperature of 110+5C 230+9F.E.(Density,kg/m)=(A X 997)/(B-C)(1)and an average evaporation rate of at least 25 g/h.Determineevaporation rate in accordance with T
7、est Method C88.E.(Density,Ib/fr)=(A X 62.3)/(B-C)(2)7.Sampling,and Making,and Curing Test Specimenswhere:7.1 Sampling-Sample field-mixed concrete in accordanceEmmeasured equilibrium density,kg/m3 Ib/ft3,mass of cylinder as dried,kg b.with Practice C172.Bmass of saturated surface-dry cylinder,kg lb,a
8、nd7.2 Specimens for Determining Equilibrium Density andCapparent mass of suspended-immersed cylinder,kgOven-dry Density-Determine the equilibrium density andb.oven-dry density on 150 by 300-mm 6 by 12-in.concrete8.3 Measurement of Oven-Dry Density-After 24 h but notcylinders.to exceed 32 h,remove th
9、e cylinders from the mold(see Note7.2.1 Make test cylinders in accordance with Practice C192/4).Measure the apparent mass of the cylinders while sus-C192M or C31/C31M,whichever is applicable.Make threepended and completely submerged in water and record as Gcylinders for equilibrium density measureme
10、nts,and makethe mass of the suspended-immersed cylinders.Remove fromthree cylinders for oven-dry density measurements.the water and allow to drain for I min by placing the cylinders7.3 Curing Specimens:on a 9.5-mm 38-in.or coarser sieve cloth.Remove visible7.3.1 Unless otherwise specified,test cylin
11、ders used for thewater with a damp cloth,determine the mass and record as F.determination of equilibrium density shall be cured in accor-the mass of the saturated surface-dry cylinders.Place thedance with Practice C192/C192M or the standard curingcylinders in the drying oven at 110+5C 230 9Ffor 72pr
12、ocedure in Practice C31/C31M.h.Allow cylinders to cool for at least thirty minutes but notNor 2-Cylinders may be stripped after 24 h and wrapped securelymore than I hour and determine the mass.Repeat oven-drying,with a plastic sheet or bag to prevent loss of moisture,or may remain incooling,and dete
13、rmination of mass at 24-h intervals until thecovered molds until the time of test.change in mass is not more than 0.5%Record this mass as7.3.2 Unless otherwise specified,for the first 24 h or untilD,the mass of the oven-dried cylinder.Determine thethe time of test,store the test cylinders used for t
14、he determi-oven-dry density from Eq 3 and 4.nation of oven-dry density under conditions that maintain aO(Density.kglm)=(D x 997)1(F-G)(3)temperature adjacent to the cylinders in the range from 16 to 27C 60 to 80 Fand that prevent loss of moisture from theO.(Densiry,Ib/fr)=(D X 62.3)/(F-G)(4)cylinder
15、swhere:8.ProcedureO=measured oven-dry density,kg/m3 Ib/ft,Dmass of oven-dry cylinder,kg lb,8.1 Measurement of Freshly Mixed Concrete Density-Fmass of saturated surface-dry cylinder,kg lb,andDetermine the density of the freshly mixed concrete in accor-Gapparent mass of suspended-immersed cylinder,kgd
16、ance with Test Method C138/C138M.b:NorE 3-Numerous observations indicate that the same compactiveNorE 4-Determination of oven-dry density may be specified to begineffort used on smaller concrete specimens will cause the fresh densities toat an age other than 24-h.be higher.The fresh density as deter
17、mined from measurements on 150 by300-mm 6 by 12-in.cylinders of lightweight concrete consolidated by9.Calculationrodding,in accordance with Practice C192/C192M or Practice C31/C31Mwill average 40 kg/m32.5 Ib/fthigher than the fresh density as9.1 Calculation of Oven-Dry Density-Where mixturemeasured
18、using a 14-L 0.5-ftmeasure in accordance with Test Methodquantities,aggregate moisture content,and the volume of theC138/C138M.concrete batch are known,calculate an oven-dry density using8.2 Measurement of Equilibrium Density-To measure theEq 5.equilibrium density,remove the cylinders from their cur
19、ingO.=(M+Mk+1.2M)/V(5)Copyright by ASTM Intl(all rights reserved):Thu Sep2000:21:44 EDT 2012 2C567/C567M-11where:10.1.5 Equilibrium density reported to nearest 10 kg/m0.50.calculated oven-dry density,kg/m3 lb/ft3.1b/ft31.Mar mass of dry fine aggregate in batch,kg lb,10.1.6 Age at which equilibrium w
20、as reached,days.Mdemass of dry coarse aggregate in batch,kg Ib10.1.7 Mass of oven-dry cylinder,kg lb.mass of cement in batch,kg lb.10.1.8 Oven-dry density rounded to the nearest 10 kg/m31.2factor to approximate the mass of cement plus0.51b/fm31.chemically combined water,and10.2 When oven-dry and app
21、roximate equilibrium densitiesvolume of concrete produced by the batch m3 ft.are determined by calculation,report the following informa-9.2 Calculation of Approximate Equilibrium Density-tion:Using the oven-dry density determined in accordance with 8.310.2.1 Fresh density,kg/m lb/ft.or 9.1,calculate
22、 the approximate equilibrium density from Eq10.2.2 Mass of cement and dry aggregates,batched,kg lb.6 and 7.10.2.3 Volume of concrete produced from the batch,mE=O。+50kg/m33lb/(6)ft.10.2.4 Calculated oven-dry density,to the nearest 10 kg/m3Or0.5lb/ft.E=O+50 kg/m 3 Ib/ft(7)10.2.5 Calculated approximate
23、 equilibrium density,to thenearest 10 kg/m0.5 Ib/ft.where:E calculated equilibrium density(see Note 1).11.Precision and Bias11.1 Precision-The precision of this test method has not10.Reportyet been determined,but an industry-wide multilaboratory10.1 When oven-dry and equilibrium densities are deter-
24、testing program is being coordinated.The precision statementsmined by measurements,the report shall include followingwill be included when the data is compiled and reviewed.information:11.2 Bias-Bias for this test method cannot be determined10.1.1 Fresh density,kg/mlb/ft.since there is no reference
25、standard available for comparison10.1.2 Mass of suspended-immersed cylinder,kg lb.12.Keywords10.1.3 Mass of saturated surface dry cylinder,kg lb.12.1 equilibrium density:lightweight concrete;oven-dry10.1.4 Mass of cylinder after reaching equilibrium,kg lb.densitySUMMARY OF CHANGESCommittee C09 has i
26、dentified the location of selected changes to this test method since the last issue,C567-05a,that may impact the use of this test method.(Approved December 15,2011)(/Revised the standard as a dual units test method.ASTM Intemational takes no position respecting the validity of any patent rights asse
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29、eful consideration 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,
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