SHRP-A-379 traducir

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As a minimum, the test system should meet the following requirements: Load Measurement and Control Range: + 4.5 kN Resolution: 0.002 kN Accuracy: + 0.004 kN DispIacement Measurement and Control Range: _+_+ 5.0 mm Resolution: 0.00254 mm Accuracy: 5:0.005 mm Frequency Measurement and Control Range: Resolution: Accuracy: 5 to 10 Hz 0.005 Hz 0.01 Hz Temperature Measurement and Control Resolution: Accuracy: 0.25°C _+0.5°C 2.2 Miscellaneous Apparatus: • epoxy for attaching nut to specimen • screw, nut, block assembly for referencing LVDT to neutral axis of specimen • jig for setting proper clamp spacing 3. TEST SPECIMENS 3.1 Compacted Bituminous Concrete Specimens--Specimens shall be sawn on all sides with a diamond blade from a slab or beam of bituminous mixture prepared by kneading compaction or rolling wheel compaction. Specimens shall be 381 + 6.35 mm in length, 50.8 + 6.35 mm in height and 63.5 + 6.35 mm in width. 3.2 Measurement of Specimen Size--Measure the height and width of the specimen at three different points along the middle 90 mm of the specimen length. Report measurements to the nearest 0.025 ram. Average the three measurements for each dimension and report the averages to the nearest 0.25 rru_. 178
3.3 Epoxy Nut to Neutral Axis of Specimen--Figure 2 illustrates a nut epoxied to the neutral axis of the specimen. Locate the center of a specimen side. Apply epoxy in a circle around this center point and place the nut on the epoxy such that the center of the nut is over the center point. Avoid applying epoxy such that it fills the center of the nut. Allow the epoxy to harden before moving the specimen. 4. TEST PROCEDURE 4.1 Stabilize Specimen to Test Temperature--If the ambient temperature is not 20°C, place the specimen in an environment which is at 20 + 1°C for 2 hours to ensure the specimen is at the test temperature prior to beginning the test. 4.2 Specimen Setup--Refer to figures 3 and 4. The clamps should be open to allow the specimen to be slid into position. The jig is used to ensure proper horizontal spacing of the clamps: 119 mm center-to-center. Once the specimen and clamps are in the proper positions, close the outside clamps by applying sufficient pressure to hold the specimen in place. Next, close the inside clamps by applying sufficient pressure to hold the specimen in place. Figure 4 illustrates the connection of the screw/nut/block assembly and the LVDT such that beam deflections at the neutral axis will be measured. Attach the LVDT block to the specimen by screwing the screw into the nut epoxied to the specimen. The LVDT probe should rest on top of the block and the LVDT should be positioned and secured within its clamp so its reading is as close to zero as possible. 4.3 Test Parameter Selection--The operator selects the following test parameters and enters them into the automated test program: deflection level, loading frequency and load cycle intervals at which test results are recorded and computed by the computer. The deflection level depends on the strain level desired. The loading frequency should be between 5 and 10 Hz. The selection of load cycle intervals at which test results are computed and recorded is limited by the amount of memory available for storing data. 4.4 Estimation of Initial Stiffness--Apply 50 load cycles at a constant strain of 100-300 micro-in/in. Determine the specimen stiffness at the 50th load cycle. This stiffness is an estimate of the initial stiffness which will be used as a reference for determining specimen failure. 4.5 Selection of Strain Level--The selected deflection level should correspond to a strain level such that the specimen will undergo a minimum of 10,000 load cycles before its stiffness is reduced to 50 % or less of the initial stiffness. A stiffness reduction of 50 % or more represents specimen failure. A minimum of 10,000 load cycles ensures the specimen does not decrease in stiffness too rapidly. 4.6 Testing--After selecting the appropriate test parameters, begin the test. Monitor and record (if not automated) the test results at the selected load cycle intervals to ensure the 179
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SHR -A-379 The SUPERPAVE Mix Design
Page 3 and 4:
Acknowledgments The research descri
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M-003 Determining the Shear and Sti
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Introduction This volume of the Fin
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Table 2. AASHTO and Other Test Meth
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T48 Method of Test for Flash and Fi
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10. KEY WORDS Asphalt binder, aspha
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Table 1. Performance-Graded Asphalt
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2.2 ASTM Standards: C802 Conducting
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7. APPARATUS 7.1 Bending Beam Rheom
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7.6 Calibrated Thermometers--Calibr
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11.3 Perform a daily quality contro
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NOTE9.--The specified preload on th
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dG d2 --_ I d __
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CO U_ P z_ MLLI L_O° _ _ _c_ r_ j4
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m) _L wO O_ W _Z _W W_ Z w W_ 0 _ w
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1.4 Maximum bending stress--The max
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Sy = log S(8) + log S(15) + ... log
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Z 1.3 1.2 1.1 , , .... J 1 • '; "
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T240 Test Method for Effect of Heat
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5.2 The complex shear modulus is an
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7. HAZARDS 7.1 Standard laboratory
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9.1.1.2.3 A thermocouple probe shal
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Typically, reliable test results ma
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figure 1 can be generated by gradua
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150 "ZERO" STRAIN VALUE O" STRAIN V
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5.3 For evaluating an asphalt binde
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time. A change in the load signal e
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9.1.1 Load cell--Verify calibration
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11.2 Immediately after demolding, p
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13.1.5 the average failure strain,
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IA A 5,0 I 6 0 86,0 9,5 FILLET O,K.
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--__6_- -_A AL AL _ o 0 _ _ _ "_ f-
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I __;___ i --_'-- :" (_ . /_/Spring
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points within the pressure vessel a
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NOTE7.--Aging temperature in the PA
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13. KEY WORDS Accelerated aging, el
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to temperaturetransducerand te_llpe
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3. SUMMARY OF METHOD 3.1 The paving
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7. PRECAUTIONS 7.1 Solvents should
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9.4 Final Extraction and Recovery 9
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Glass Wool Plug Figure 2. Extractio
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5.761 in I.D. 6 holes 3/16 in I.D.
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1/4 I.D. 5 3/4 in I.D. 6 holes 5/16
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Polypropylene Cloth Filter I" .....
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114 in I.D. 11 1/4 in I.D. 8 holes
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3. SUMMARY OF TEST METHOD 3.1 A sol
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drying should be re-dried. Caution:
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8.16 Clean the funnels, volumetric
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Adsorption/Desorption Testing Data
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2.3 ASTM Standards: D 4402 Measurem
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5.6.3 Start time of test; 5.6.4 Spe
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9.1.1 Weigh the aggregate fractions
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11. CALCULATIONS AND INTERPRETATION
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3.1 Test System--The test system is
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4.3 Determine Air Void Content--Det
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• vertical displacement of the sp
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The following engineering quantitie
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the axial actuator is under closed
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Figure 2. Platen-Specimen Assembly
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Figure 4. Positioning of Vertical a
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tO0 © © ....... OT...=.c on A TEM
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Standard Method of Test for Determi
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3. SUMMARY OF METHOD 3.1 This test
Page 133 and 134: 6.5.1 For analog strip-chart record
Page 135 and 136: 8. PROCEDURE 8.1 Measure the bulk s
Page 137 and 138: movement per minute. Both the horiz
Page 139 and 140: If E is greater than 0.01, substitu
Page 141 and 142: Table 1. Correction Factors for Hor
Page 143 and 144: Figure 2. Specimen Loading Frame wi
Page 145 and 146: Standard Method of Test for Determi
Page 147 and 148: 6. APPARATUS 6.1 Environmental Cond
Page 149 and 150: 9.3 Heat or cool the asphalt concre
Page 151 and 152: pressed. Otherwise, measure and rec
Page 153 and 154: 10.7.2.3 Apply a repeated axial com
Page 155 and 156: 11.3.1 Peak Stress (kPa) per load c
Page 157 and 158: 12.1.3 Aggregate Type and Gradation
Page 159 and 160: Specimen Temperature Hi/Lo Limit Pr
Page 161 and 162: i Pressure Differential Gauge /_ 0
Page 163 and 164: I0 0 0 0 0 0 0 0 0 Ooo00 0 0 '_,Oo
Page 165 and 166: " Total Elastic 0 Ei._ 0 121 Plasti
Page 167 and 168: T201 Method of Test for Kinematic V
Page 169 and 170: 6.4.4 One metal spatula or spoon 6.
Page 171 and 172: 11.1.1 Asphalt Binder Grade 11.1.2
Page 173 and 174: D 1561-81a Preparation of Bituminou
Page 175 and 176: After filling, close all containers
Page 177 and 178: l i /l Gmb = . (1) B-Cwhere A = Mas
Page 179 and 180: 8. REPORT 8.1 The report shall incl
Page 181 and 182: 1 RAMP, ..:i!i!iiiii:i:i:i:i:i:i:i:
Page 183: Standard Method of Test for Determi
Page 187 and 188: 5.1.6 Cumulative Dissipated Energy
Page 189 and 190: plot 6.1.11 Plot of Dissipated Ener
Page 191 and 192: Figure 2. Nut Epoxied to Neutral Ax
Page 193 and 194: Figure 4. Nut/Block/Screw/LVDT Conn
Page 195 and 196: 0 OO £ m -r"_ mlO 5 10 4 , [ 'T I
Page 197 and 198: As a minimum, the test system, shou
Page 199 and 200: With the ink marker, trace diar_.et
Page 201 and 202: 5. CALCULATIONS A_er the specime_ f
Page 203 and 204: Step Motor L,.._ Loading Rod Swivel
Page 205 and 206: ATHENA TEMPERATURECONTROLLER ii:!i:
Page 207 and 208: Standard Practice for The Laborator
Page 209 and 210: 2.2 SHRP Documents B-006 Extraction
Page 211 and 212: using the same SUPERPAVE ® perform
Page 213 and 214: must be used with the modifier from
Page 215 and 216: 8.2.3 Sections 8.3 and 8.4 present
Page 217 and 218: 8.8.2 Conditioning and Testing--Car
Page 219 and 220: 9. LABORATORY EVALUATION OF AGGREGA
Page 221 and 222: shear, volumetric and frequency swe
Page 223 and 224: 12.2 The HMA plant should produce t
Page 225 and 226: Table 1. Modifier Selection and Cha
Page 227 and 228: Table 5. Guidelines for Binder Modi
Page 229 and 230: Standard Practice for Grading or Ve
Page 231 and 232: 6. TEST PROCEDURE FOR GRADING AN UN
Page 233 and 234: 7. TEST PROCEDURE FOR VERIFYING THE
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8. REPORT 8.1 If the grade of the a
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1.4 In order to attain adequate pre
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5.4 Calculate the bulk specific gra
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Standard Practice for Measurement o
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Table 1. Test Matrix for Level 2 Mi
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6. SPECIMEN PREPARATION 6.1 All tes
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Record axial deformation, shear def
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7.3.5 Since the specimen will be su
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NOTE 15.--At each temperature, the
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Table 7. Time Estimate for Level 2
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NOTEA1.2.--This stress-controlled t
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