SHRP-A-379 traducir

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2.3 Other Documents 2.3.1 National Aggregates Association Test Method A--Fine Aggregate Angularity 2.3.2 Pennsylvania Test Method No. 621 (April 1987)--Determining the Percentage of Crushed Fragments in Gravel 2.3.3 Task Force 31--Polymer Modified Asphalts, Joint Committee of AASHTO- AGC-ARTBA, Subcommittee on New Highway Materials (January 1991)--Guide Specifications for Polymer Modified Asphalt, Version 2.7. 3. DEFINITIONS 3.1 Modifier--a materiaI incorporated in hot mix asphalt (HMA) or other types of asphalt paving mixes in addition to the asphalt cement, aggregate and mineral filler, in order to control the development of pavement distresses and enhance overall pavement performance. Modifiers may be any organic or inorganic material of suitable manufacture, used in virgin or recycled condition, that is dissolved, dispersed or reacted in asphalt cement or HMA or coated on aggregate particles. 3.2 Base Asphalt Binder--an unmodified asphalt cement used in the production of a modified asphalt binder. The performance grade of a base asphalt cement may be substantially different from that of an unmodified asphalt binder customarily used in a particular location. a particular 3.3 Conventional Asphalt Binder--an unmodified asphalt cement customarily used in location. 3.4 Type I Polymer Modified Asphalt Binder--a conventional asphalt cement to which styrene block copolymers have been added (Guide Specifications for Polymer Modified Asphalt). 3.5 Type H Polymer Modified Asphalt Binder--a conventional asphalt cement to which styrene butadiene rubber (SBR) latex or neoprene latex has been added (Guide Specifications for Polymer Modified Asphalt). 4. SUMMARY OF THE PRACTICE 4.1 This practice presents a procedure for the laboratory evaluation of modified asphalt binder and paving mixes for HMA pavements. It utilizes the SUPERPAVE ® performance-based binder and paving mix tests, specifications, mix design system, and pavement performance prediction models. Materials are evaluated as a single component and/or as a multi-phase component in the final paving mix produced for roadway placement 206
using the same SUPERPAVE ® performance criteria established for conventional (unmodified) materials. 4.2 The selected modifiers are characterized by standard physical and chemical properties used to identify them for future reference. Modified materials are then characterized according to the SUPERPAVE ® performance-based specifications and mix design system, Any properties specifically intended for quality control of production or performance of the modified asphalt binder, aggregate, or paving mix are identified. 4.3 The final choice of materials (modifier, base asphalt cement, and aggregate) is guided by reference to the criteria that led to the decision to use a modifier and to any restrictions on the availability of materials. NOTE 1.--The information required for the selection of modifiers for asphalts, aggregates or paving mixes will usually be provided by the modifier producer. However, it can also be obtained from the literature and by contacting other modifier users. The targeted pavement distress(es) should be indicated. The effect of the modifier on other pavement performance areas must also be considered in the selection process. This information and the historical pavement and laboratory performance will aid in determining whether a given modifier will address the key pavement problems in the targeted climatic and traffic conditions. NoTE 2.--The results of the characterization of each modified material should be compared with MP1 criteria, historical data and the characteristics of conventional asphalt binders. Based on this comparison, if the expected pavement performance is acceptable, the evaluation should proceed to the next step (modified asphalt binder, aggregate, paving mix or pavement evaluation). 4.4 If the expected performance is unacceptable at the completion of any step in the laboratory evaluation of a modifier, the modifier is rejected or the process is repeated with another modifier, base asphalt binder, or aggregate to optimize the formulation. The evaluation may also go forward to the next step, even if the properties and performance of the modified asphalt binder or paving mix are unfavorable, in order to develop additional data for making a final decision on the use of a candidate modifier. 4.5 The cost of producing and placing the materials is estimated to aid in the decision regarding the use of the modified system. In addition, a simple analysis of the lifecycle cost of using the modified materials is made from the results of the SUPERPAVE ® performance-based mix tests and pavement performance prediction models, where appropriate, and compared to the use of conventional asphalt binders and paving mixes. 4.6 The modified HMA production and laydown should be completed using only the equipment and procedures recommended by the modifier producer. The pavement should be produced in accordance with the material proportions and volumetric properties developed in the SUPERPAVE ®mix design. 5. SIGNIFICANCE AND USE 5.1 This practice presents detailed procedures for evaluation of modified asphalt binder, aggregate, and paving mix, singly or in combination. The laboratory tests used in 207
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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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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
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6.5.1 For analog strip-chart record
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8. PROCEDURE 8.1 Measure the bulk s
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movement per minute. Both the horiz
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If E is greater than 0.01, substitu
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Table 1. Correction Factors for Hor
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Figure 2. Specimen Loading Frame wi
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Standard Method of Test for Determi
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6. APPARATUS 6.1 Environmental Cond
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9.3 Heat or cool the asphalt concre
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pressed. Otherwise, measure and rec
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10.7.2.3 Apply a repeated axial com
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11.3.1 Peak Stress (kPa) per load c
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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 and 184: Standard Method of Test for Determi
Page 185 and 186: 3.3 Epoxy Nut to Neutral Axis of Sp
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: 2.2 SHRP Documents B-006 Extraction
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
Page 235 and 236: 8. REPORT 8.1 If the grade of the a
Page 237 and 238: 1.4 In order to attain adequate pre
Page 239 and 240: 5.4 Calculate the bulk specific gra
Page 241 and 242: Standard Practice for Measurement o
Page 243 and 244: Table 1. Test Matrix for Level 2 Mi
Page 245 and 246: 6. SPECIMEN PREPARATION 6.1 All tes
Page 247 and 248: Record axial deformation, shear def
Page 249 and 250: 7.3.5 Since the specimen will be su
Page 251 and 252: NOTE 15.--At each temperature, the
Page 253 and 254: Table 7. Time Estimate for Level 2
Page 255: NOTEA1.2.--This stress-controlled t
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