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t: STATE OF CALIFORNIA—BUSINESS AND TRANSPORTATION AGENCY DEPARTMENT OF TRANSPORTATION _, California Test 301 t - 1978 DIVISION OF CONSTRUCTION Office of Transportation Laboratory P.O. Box 19178 Sacramento,California 95819 (916) 4444900 METHOD OF TEST FOR DETERMINAT10h OF THE RESISTANCE "R" VALUE OF TREATED AND UNTREATED BASES, SUBBASES AND BASEMENT SOILS BY THE STABILOMETER A. SCOPE C. TEST RECORD FORM This method covers the procedure for determin- Keep all pertinent data regarding tht test 5peci- ing the Becistance (R-value} of both treated and un- mens on individual test tickets (1�orm T.I_,.-328%V). lrcated soils or aggregates for use as base,subbase or Assign a ticket at the time of prepal—ion of 16e basement soil,and also covers the calculation of dc- material for the apecimcn,and keep it with the speci- men until the stabilometer R-value test is made.At sign thickness of pavement scctinns. This test method is divided into the following that time, copy all data onto the work ..rd, farm parts: F.1..361. 1. Method of Preparation of'Materials D PREPARATION OF SAMPLE 11. Method of Compaction 1. Refer to California Test 201 for preparation of II1. 'Method of Determination of Exudation Pres- sample. sure of 11-value Test Specimens ? The preparation of 11-value test san,plics must IV. Method of Determining the Expansion fres- include removal of coatings from coarse aggregates, sures of R-value'fest Specimens and clay lumps must be broken down to pass the No. V. Method of Determining the Stabitometer Be- 4 sieve.l This is important because relatively shall sistance 11-value by Moans of the Stabilome- test specimens are used. Therefore, it is necessary ter that the test specimen be prepared very acema'cly. V1. Method of Calculating the Densities of R-val- ue Test Specimens E. CALCULATIONS FOR DETERMINING GRADINGS VIT. Method of Calculating the R-value of a AND BATCH WEIGHTS USED IN PREPARING R-VAL- Material by the Stabilomcter and E%pansion UE TEST SPECIMENS Pressure 1. Definitions of"as received"and"as used"grad- V1Il. Method of Calculating the Design Thickness ings. of Pavement Sections Based on the Results of a. The grading as determined on a sample prior to the R-value Tests any adjustment such as scalping, wasting or crushing is known as the"as received"grading. PART 1. METHOD OF PREPARATION b. Before a material can be tested,it is often neces- OF MATERIALS sary to adjust the grading either to meet specifi- cations or to eliminate material too large to test. A. SCOPE This adjusted grading is referred to as the"as This part of the procedure describes the method% used" grading. In cases where.. 1110 percent of of bate'.ing materials,the mixing of specimens and the material as received passes the:'/.-inch sieve the curing of the materials.The initial preparation of and nc adjustments are necessary. the "as re- the samples is described in California Test 201. ceiver'and the'.w used"gradings will be the sant. B. APPARATUS ?. Cri cri t for scalping (removing the oversize I. Riffle splitter, with chutes'/. inches %vide. lit;lteriat.) s.anples containing oversize m:.tcrial. 2. Scales,5,000-gram capacity,accurate to 1 grmt• if' 5 percent or more of the sample as received 3. Scales,500-gram capacity,accurate to 0.1 grain. — 4. Water spray metering device with turnlable. �nrscry,linnlorhisisprepar.Siono(nmtrriu6rursislinE,,da regalrrnd r Cans %with rntjumpslullbakand su:(aero,.tprs•l.;uatinnurllle,-ronsistsmdyof 5. Mixing pans, trowel and l/1-g."Il1nT1 a•p3ra1WT1 cn the l inchsiert ondean•fuE%I,BIAnl•.,i ie4 samplo from .._--- __-- ---- .—...._._.__.CIOtie-fit ting..lids. ------ .---.._.the.passingl.inchrt.,ctio 1