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p' n OWN 4101 California Test 301 1978 E. PEST PROCEDURE AND CALCULATIONS (i. Every attempt should be made to fabricate test I. l.nck lire stabilomcter to the stage h;lso v+;th Jie sl`ccitnrns halving an overall l,cig:,l bet,+ccn h.45 locking ,ted. force the specitncil, which has previ- inches and 2.55 inches. Ilovvcvcr, if for Sime reason ousIv been tested for eximnsion pressure !Part w), this is real posible, lire 1Z•value slloulci be corrcctcfl into the stabilomcter, Place the soli(I-Wali follower as indicated on the accompany ing char t (figure 14). Ince Precautions,Sect, F-5) on top of the specil"ll F. PRECAUTIONS ;laid center the:tabilomctcr assembly under talc test- 1 Care mwA be exercised to avoid disrupting lire int;mach:lle Head.'Lower the te..,ting Illachille head Compacted specimen +w11lIC trallSft-rring it from the ltntil it just ellgages the fo:lolwer but does!lot applyn10:d IO the stabi101rtCleT.This applies particularly to any load to the specimen. Adiust the ytabilometer those satrtples composed of coarse granu!ur u:ateri- pump to give a horizontal pressure of ex;lctly o psi. ani. licgin application of a vertical load to the test speci- n, Ilvdr;ullic testing machines must be operated Inc,,at a spood of 0.03 inches per minute. seVVra Illillutes heforc the oil v+'arltls sufficiently to 2. liecord the stabilomcter gauge readies when il,ctinlain a constant spud. the vertical pressures are 80.and Ifo psi,which ire 3, 'rhe operator's uttelntion should not be diverted ;applied vertical fatal loads of 1,(M and 2,000 pounds. for any reason during the application of the vertical respectively, load to the test specimen Allowing the testing ma- 3. Vertical loading by the testing machine must chine to laid in excess of 2,000 pounds on soft fluid cease at 2,000 pounds and the load must be ililnledi materials can result in damage to the horizontal pres- stabilometer sure gunge on the stabilomcter. utelyreduced to 1,000 pounds.Turn the pump so that the horizontal pressure is reduced to 3 4. Do not use anything but the fingers to close the psi.This vvilk result in a further reduction in the ap- :lir cell needle valve of the stabilorneter.The use of plied testing machine Ioad which is normal and pliers or wrench to tighten it%vi'i damage the valve should be ignored. Set the turns displacement dial seat and cause it to leak air in suLseducnt operations. indicator to zero.Turn the pump handle at approxi- 3• Substitution of a cage or vane type follower for mately tvwo turns per second until the stabilomcter the specified solid-v+'all follower will result in high gauge reads 100 psi. During this operation the up- displacement readings and may rupture the stabi- plied testing machine load will increase and in some lometer diaphragm!. cases exceed the initial 1,000-pound load.As before, these changes in testing machine loadings are nor- G. NOTES dial and should be ignored. The R-values developed by individual test speci- 4. Record the number of turns indicated on the mens in a group composed of the same material,are dial as the displscoulent of the speeimcn.The turns inverse functions of their moisture contents at Com— indicator dial leads in.001 inch,and each 0.1 inch is paction. equal to one turn.'thus,a net reading of 0.250 inch A test specimcnt which has been destructively dis- indicates that 2.50 turns were made +with the dis- rupted due to rough handling, transfer from the placement pump.This measurement is known as the inold to stabilomcter,or as a result of the test itself, turns displacement of the specimen, will eshil,it excessively high horizontal pressure and 5. Calculate the stabilomr ter R-value from tine fol- turns displacennent readings. lowing formula: increasing the roughness or coarseness of the tel:- tEquation #0 t,ire oil the peripherad surface of a test specimen R=100-10011[(2.5 rel)][(P,i Pi,}—l]+1] or use rig. causes a reduction in the horizontal pressure values 13 obtained from the stabilometer. This influence on the results is brought about by specimen roughness. Where. To compensate for coarse surface texture character- P, -=160 psi vertical pressure istics the turns displacement determination is ap- a—Turns displacement reading ,lied through the R-value formula as a correction P,,,horizontal pressure(stabiloineter gauge TCad 1 factor. Soft est specimens also have high displace- pressure for 160 psi vertical pressure) rrlents. However, these specimens also have high The attached stabilomcter 11-value Chart (Figure transmitted pressures. it will be rioted in the at- 13) is normally used to solve the above formula. (ached chart for calculating R-values (Figure 13) Upper testing machine head should be spherically srate3 and free urting. that the displacement COFT0Ct10n for the -v materials - - 1f the same machine is also used-for lire riodation-pressure lest:thedoes not.greatly affect the calculated_R-V3 Ce. "locking shims"sprcirini in Pall 111-1)-4 should be removed helnre - perfurming the slabilosneter test- 18