ASTM_D_3668_-_78_1985.pdf

Designation:D 3668 78(Reapproved 1985)An American National StandardStandard Test Method forBearing Ratio of Laboratory Compacted Soil-Lime Mixtures1This standard is issued under the fixed designation D 3668;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)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.Scope1.1 This test method covers the determination of the bearingratio2of soil-lime mixtures when compacted and tested in thelaboratory by comparing the penetration load of the soil-limemixture to that of a standard material.2.Referenced Documents2.1 ASTM Standards:D 698 Test Methods for Moisture-Density Relations ofSoils and Soil-Aggregate Mixtures Using 5.5-lb(2.49-kg)Rammer and 12-in.(305-mm)Drop3D 1557 Test Methods for Moisture-Density Relations ofSoils and Soil-Aggregate Mixtures Using 10-lb(4.54-kg)Rammer and 18-in.(457-mm)Drop3D 2216 Method for Laboratory Determination of Water(Moisture)Content of Soil,Rock,and Soil-AggregateMixtures3D 3551 Method for Laboratory Preparation of Soil-LimeMixtures Using a Mechanical Mixer33.Apparatus3.1 Loading Machine,having a capacity of at least 10 000lbf(44.5 kN)and equipped with a movable head or base thattravels at a uniform(not pulsating)rate of 0.05 in.(1.27mm)/min,for use in forcing the penetration piston into thespecimen.The machine shall be equipped with a load-indicating device that can be read to 10 lbf(44 N)or less.3.2 MoldThe mold shall be of metal,cylindrical in shape,with an inside diameter of 6 6 0.005 in.(152.46 0.13 mm)anda height of 7 6 0.005 in.(177.8 6 0.13 mm).It shall beprovided with a metal extension collar 2.0 in.(50.8 mm)inheight,and a perforated metal base plate38in.(9.53 mm)inheight.The perforations in the base plate shall not exceed116in.(1.59 mm)in diameter.3.3 Spacer DiskA circular metal spacer disk(see Fig.1)51516in.(150.8 mm)in diameter and 2.416 in.(61.4 mm)inheight.3.4 RammerA metal rammer as specified in either TestMethods D 698 or D 1557.Automatic rammers or the slidingweight rammer shown in Fig.2 may be used,provided thecompactive effort given is the same as that given by thecomparable rammers described in Test Methods D 698 orD 1557.3.5 Expansion-Measuring Apparatus An adjustable metalstem and perforated plate,with perforations in the plate notexceeding116in.(1.59 mm)in diameter,and a metal tripod tosupport a dial gage for measuring the amount of swell duringsoaking(see Fig.1).3.6 Surcharge WeightsOne annular metal weight andseveral slotted metal weights weighing 5 lb(2.27 kg)each,578in.(149.2 mm)in diameter,with a center hole 218in.(54.0mm)in diameter(see Fig.1).3.7 Penetration PistonA metal penetration piston 1.95 in.(49.5 mm)in diameter(3 in.219.35 cm2 in area)and not lessthan 4 in.(101.6 mm)long.If from an operational standpointit is advantageous to use a piston of greater length,the longerpiston may be used(see Fig.1).3.8 GagesTwo dial gages reading to 0.001 in.(0.025mm).3.9 Miscellaneous ApparatusOther general apparatussuch as a mixing bowl,straightedge,scales,soaking tank orpan,oven,filter paper,and dishes.4.Soil-Lime Mixture4.1 The soil-lime mixture shall be prepared in accordancewith Method D 3551.5.Preparation of Test Specimen5.1 If the specimen is to be soaked,take a representativesample of the material,for the determination of moisture inaccordance with Test Method D 2216,at the beginning ofcompaction and another sample of the remaining material aftercompaction.If the test specimen is not to be soaked,take arepresentative sample of material from one of the cut facesafter penetration,as described in 6.4 to determine the moisturecontent.5.2 Clamp the mold(with extension collar attached)to thebaseplate.Insert the spacer disk over the baseplate and place adisk of coarse filter paper on top of the spacer disk.Compactthe soil-lime mixture into the mold in accordance with eitherTest Methods D 698 or D 1557.Compact the specimen atmaximum density and optimum moisture as determined by1This test method is under the jurisdiction of ASTM Committee D-18 on Soiland Rock and is the direct responsibility of Subcommittee D18.15 on StabilizationWith Admixtures.Current edition approved Dec.21,1978.Published February 1979.2Sometimes called California Bearing Ratio(CBR).3Annual Book of ASTM Standards,Vol 04.08.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.Test Methods D 698 or D 1557.Other densities and moisturecontents which are desired may be used,if indicated in thereport.5.3 Remove the extension collar and carefully trim thecompacted soil-lime mixture even with the top of the mold bymeans of a straightedge.Patch with smaller size material anyholes that may have developed in the surface by the removal ofcoarse material.Remove