SHRP-A-379 traducir

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1.7 This test may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. APPLICABLE DOCUMENTS 2.1 <strong>SHRP</strong> Documents M-002 Preparation of Compacted Specimens of Modified and Unmodified Hot Mix Asphalt by Means of the <strong>SHRP</strong> Gyratory Compactor 2.2 AASHTO Documents T166 Bulk Specific Gravity of Compacted Bituminous Mixtures T209 Maximum Specific Gravity of Bituminous Paving Mixtures T245 Test Method for Resistance to Plastic Flow of a Bituminous Mixture Using the Marshall Apparatus T247 Method for Preparation of Test Specimens of a Bituminous Mixture by Means of the California Kneading Compactor T269 Percent Air Voids in Compacted Dense and Open Bituminous Paving Mixtures T275 Standard Method of Test for Bulk Specific Gravity of Compacted Bituminous Mixes Using Paraffin-Coated Specimens 2.3 ASTM Documents D3202 Preparation of Bituminous Mixture Beam Specimens by Means of the California Kneading Compactor D3387 Test for Compaction and Shear Properties of Bituminous Mixtures by Means of the U.S. Corps of Engineers Gyratory Testing Machine (GTM) D3515 Specifications for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures D4013 Preparation of Test Specimens of Bituminous Mixtures by Means of Gyratory Shear Compactor 122
3. SUMMARY OF METHOD 3.1 This test method consists of two types of tests: a tensile creep test and a tensile strength test. The tensile strength test can be performed separately (for fatigue cracking analyses) or in concert with the creep test (for thermal cracking analyses). 3.2 A static load of fixed magnitude is applied along the diametral axis of a preconditioned specimen for a fixed duration of time, 1,000 seconds. The horizontal and vertical deformations measured near the center of the specimen are used to calculate a tensile compliance at a particular duration of time. Loads are selected to keep strains in the linear viscoelastic range (typically below 300 microstrains). By measuring both horizontal and vertical strains in regions where the stresses are relatively constant and away from the localized non-linear effects induced by the steel loading strips, the Poisson's ratio can be more accurately determined. The Poisson's ratio is then used to better predict threedimensional stresses and strains. 3.3 The failure portion of the test immediately follows the creep portion. Without releasing the creep load, a constant rate of vertical deformation (or ram movement) is applied to the specimen to failure. The failure limits determined can be input into mechanistic-based models for thermal cracking or used to compare relative qualities of mixtures. The failure portion of the test method can be performed separately when only the tensile strength properties are needed. 4. DEFINITIONS 4.1 Creep Compliance--The slow movement of asphalt concrete mixtures under a sustained load per unit of the applied stress; time-dependent strain (continuing strain) with a sustained stress level. 5. SIGNIFICANCE AND USE 5.1 The values of creep compliance can be used to evaluate the relative quality of materials, as well as to generate input for pavement design and evaluation models. From creep testing, these values include the intercept and straight line slope of log creepcompliance versus log loading time, or the entire master-compliance curve. The test can be used to study effects of temperature, load magnitude, binder content, and loading time. 5.2 When used in conjunction with other mixture physical properties, the creep compliance may contribute to the overall mixture characterization. It is one factor for determining a mixture's suitability for use as a highway paving material under given traffic and environmental conditions. 5.3 Reheated, recompacted mixtures may be used in this method, but the resulting creep compliance values will be higher than for newly prepared mixtures because of changes 123
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SHR -A-379 The SUPERPAVE Mix Design
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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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Page 81 and 82: 3. SUMMARY OF METHOD 3.1 The paving
Page 83 and 84: 7. PRECAUTIONS 7.1 Solvents should
Page 85 and 86: 9.4 Final Extraction and Recovery 9
Page 87 and 88: Glass Wool Plug Figure 2. Extractio
Page 89 and 90: 5.761 in I.D. 6 holes 3/16 in I.D.
Page 91 and 92: 1/4 I.D. 5 3/4 in I.D. 6 holes 5/16
Page 93 and 94: Polypropylene Cloth Filter I" .....
Page 95 and 96: 114 in I.D. 11 1/4 in I.D. 8 holes
Page 97 and 98: 3. SUMMARY OF TEST METHOD 3.1 A sol
Page 99 and 100: drying should be re-dried. Caution:
Page 101 and 102: 8.16 Clean the funnels, volumetric
Page 103 and 104: Adsorption/Desorption Testing Data
Page 105 and 106: 2.3 ASTM Standards: D 4402 Measurem
Page 107 and 108: 5.6.3 Start time of test; 5.6.4 Spe
Page 109 and 110: 9.1.1 Weigh the aggregate fractions
Page 111 and 112: 11. CALCULATIONS AND INTERPRETATION
Page 113 and 114: 3.1 Test System--The test system is
Page 115 and 116: 4.3 Determine Air Void Content--Det
Page 117 and 118: • vertical displacement of the sp
Page 119 and 120: The following engineering quantitie
Page 121 and 122: the axial actuator is under closed
Page 123 and 124: Figure 2. Platen-Specimen Assembly
Page 125 and 126: Figure 4. Positioning of Vertical a
Page 127 and 128: tO0 © © ....... OT...=.c on A TEM
Page 129: Standard Method of Test for Determi
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
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1 RAMP, ..:i!i!iiiii:i:i:i:i:i:i:i:
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Standard Method of Test for Determi
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3.3 Epoxy Nut to Neutral Axis of Sp
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5.1.6 Cumulative Dissipated Energy
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plot 6.1.11 Plot of Dissipated Ener
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Figure 2. Nut Epoxied to Neutral Ax
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Figure 4. Nut/Block/Screw/LVDT Conn
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0 OO £ m -r"_ mlO 5 10 4 , [ 'T I
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As a minimum, the test system, shou
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With the ink marker, trace diar_.et
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5. CALCULATIONS A_er the specime_ f
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Step Motor L,.._ Loading Rod Swivel
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ATHENA TEMPERATURECONTROLLER ii:!i:
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Standard Practice for The Laborator
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2.2 SHRP Documents B-006 Extraction
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using the same SUPERPAVE ® perform
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must be used with the modifier from
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8.2.3 Sections 8.3 and 8.4 present
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8.8.2 Conditioning and Testing--Car
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9. LABORATORY EVALUATION OF AGGREGA
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shear, volumetric and frequency swe
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12.2 The HMA plant should produce t
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Table 1. Modifier Selection and Cha
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Table 5. Guidelines for Binder Modi
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Standard Practice for Grading or Ve
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6. TEST PROCEDURE FOR GRADING AN UN
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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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