Summary of Rubber Modified Asphalt Product Specifications around ...

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New Jersey, and Massachusetts DOTs specified higher temperatures when adding CRM into the base asphalt cement. California is at the higher end with a specification of 190 -226 o C (375- 440 o F) when CRM is added and 190-218 o C (375-425 o F) when blending. Ontario’s blending temperature 180 o C (356 o F) is similar to that of Arizona and is in the middle of all agencies in the Table 2. Blending time is also a big factor affecting final uniform formation of rubberized asphalt cement. The field blend viscosity, normally measured by a Haake viscometer, increases at the beginning of the blending process, reaches a peak value, and then starts to drop or remain constant with longer blending times. This procedure is called asphalt rubber design profile and is required by California. Ontario doesn’t require an asphalt rubber design profile. It requires a minimum of 45 minutes of blending time and requires field blend viscosity of 1500 – 4000 cP. The common tests specified for rubberized asphalt cement are field blend rotational viscosity, cone penetration, resilience, and softening point. Table 2. Comparison of Rubberized Asphalt Cement from Various Agencies Agency CRM percentage Ontario, Canada Blending temperature 18-20% 180 o C (356 o F) California 20 ± 2%; for CR, 75% scrap tire CR and 25% high natural CR. 190 -226 o C (375-440 o F) when CRM is added. 190-218 o C (375-425 o F) when blending. Blending time 45 minutes 45 minutes min. Field blend viscosity, cP, and other tests 1500-4000 using California LP-11; Penetration 25- 70 Resilience 18% min; Softening point, 52-74 o C (125- 165F) 1500-4000 using California LP-11; Penetration 25- 70 Resilience 18% min; Softening point, 52-74 o C (125 - 165F) Others CRM gradation, mixing method, dosage, reaction time, storage condition, etc. shall be determined by contractor. Make sure anti-stripping agent is compatible with the RMA mix and RAC. Asphalt modifier should be added to the binder at 2.5 to 6% of paving asphalt. The asphalt modifier shall be a resinous, high flash point, aromatic hydrocarbon compound. Maximum of 2 reheat cycles. 7
Agency CRM percentage Blending temperature Arizona Min 20% 180-205 o C (350-400 o F) when CRM is added. 165-190 o C (325-375 o F) when Texas Minimum 15% Florida Minimum 20% New Jersey Minimum 17% blending. Didn’t mention 168-190 o C (335-375 o F) 180-205 o C- (350-400 o F) when CRM is added. 165-190 o C (325-375 o F) when blending. Blending time 60 minutes minimum. Didn’t mention 30 minutes minimum 60 minutes minimum Field blend viscosity, cP, and other tests 1500-4000 cP; Penetration minimum 10- 25; softening point, minimum 52-57 o C (125- 135 o F) 1500-5000 cP; Penetration 25- 75 for hot mix, 50-100 for surface treatment. Resilience, 20% minimum for hot mix, 10% minimum for surface treatment. Flash point, 232 o C(450 o F) 1500 cP. Rubber gradation is Type C ASTM Type II; 2000-4000 cP; Resilience, 25% minimum Others Submit an asphalt rubber design by an approved lab. Application temperature range: 165-220 o C (325- 425 o F); Maximum 220 o C(425 o F); Storage maximum 220 o C(425 o F). Excess asphalt rubber can be used for non rubber mix as long as AR binder is less than 2% of regular binder. 8
Page 1 and 2: Summary of Rubber Modified Asphalt
Page 3 and 4: Acknowledgements We appreciate the
Page 5 and 6: Appendix I: Arizona Asphalt Rubber
Page 7 and 8: 3.0 Asphalt Rubber Binder Specifica
Page 9 and 10: Agencies Source Gradation Additives
Page 11: Agencies Source Gradation Additives
Page 15 and 16: 4.2 Material Property Testing of Te
Page 17 and 18: Table 4. Mix Design Parameter Compa
Page 19 and 20: under snow plow activity and freeze
Page 21 and 22: 6.0 Terminal Blend Mix Specificatio
Page 23 and 24: Agency Ambient/pavement temperature
Page 25 and 26: 8.2 Construction of Asphalt Rubber
Page 27 and 28: 9.0 Summary and Recommendations for
Page 29 and 30: Appendix A: Ontario Specifications
Page 31 and 32: compound. Continue blending the RA
Page 33 and 34: 1151.05.06.04 Rubberized Asphalt Ce
Page 35 and 36: i. Acceptance and pay adjustment of
Page 37 and 38: centipoises (see Note 1) LP-11 Cone
Page 39 and 40: 1151.03 DEFINITIONS Section 1151.03
Page 41 and 42: 1151.05.06 Rubber Modified Asphalt
Page 43 and 44: 313.07.06.02 Paving Clause 313.07.0
Page 45 and 46: a) PFGAC, if the PFGAC is less than
Page 47 and 48: Appendix B: Ontario Specifications
Page 49 and 50: D. A letter from the CR supplier in
Page 51 and 52: 313.07.15.06 Rubber Modified Asphal
Page 53 and 54: considered to be 0.65. Table R1 Tri
Page 55 and 56: supplier provides ingredients and i
Page 57 and 58: The Contractor shall be solely resp
Page 59 and 60: Section Limit defines the chainage
Page 61 and 62: The referee laboratory will be desi
Page 63 and 64:
RUBBERIZED ASPHALT CONCRETE MIXTURE
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The CRM shall be sufficiently dry s
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special provisions. 2. The minimum
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AGGREGATE The aggregate for Type G
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manner specified for asphalt concre
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C. Asphalt modifier shall be tested
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B. Place one rubber ball on each si
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Test Parameter ASPHALT-RUBBER BINDE
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A. The temperature of the aggregate
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modifier. ASPHALT MODIFIER The asph
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sieve and record that number (next
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The Contractor shall provide a Haak
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modifier, and CRM. Paving asphalt a
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not more than 163°C after applying
Page 91 and 92:
Appendix G: California Terminal Ble
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6. California Test 371 test results
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Prepaving Conference Schedule a pre
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HMA Acceptance Quality Characterist
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Quality Characteristic Hot Mix Asph
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3. Isolating the scale system withi
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if the atmospheric temperature is b
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3. From the center of the specified
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The asphalt-rubber shall contain a
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Appendix J: Arizona Specifications
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TABLE 413-3 MINERAL AGGREGATE CHARA
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source(s) of mineral aggregate, pro
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413-7 Construction Requirements: 41
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discharge chute of the drier in ord
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Screeds shall include any strike-of
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in nominal thickness. (C) Rolling P
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Appendix K: Arizona Specifications
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TABLE 414-3 MINERAL ADMIXTURE Mater
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414-6.02 Mineral Aggregate: Aggrega
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Mineral admixture shall be mechanic
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Before asphaltic concrete is placed
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furnished with the machine: Ski-typ
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The accepted quantities of asphalti
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Asphalt-Rubber Stress-Absorbing Mem
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If the asphalt-rubber membrane has
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Appendix M: Texas Asphalt Rubber Sp
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• a modifier is introduced separa
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A and B aggregates differ by more t
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Flat and elongated particles Tex-28
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When shown on the plans, the Engine
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(16) Development of JMF3. Evaluate
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At any time during production, the
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acceptable tolerances listed in Tab
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Appendix O: Texas Specifications -
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Gradation Requirements for Mineral
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Table 4 (continued) Test Methods, T
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Table 6 Master Gradation Bands (% P
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(13) Trial Batch Testing. Test the
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Hamburg Wheel tests meet the specif
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air voids will be determined based
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Contractor’s or the Engineer’s
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may make as many independent densit
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In-Place Placement Pay In-Place Pla
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a sampling port. Keep A-R binder fr
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type, grade and surface aggregate c
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Control records shall include at a
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Appendix R: Florida Asphalt Rubber
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341-8 Placement of Asphalt Concrete
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AR-OGFC as specified in 401.03.03.E
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Submit to the ME a certification of
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Table 902.07.03-1 JMF Master Ranges
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Table 902.07.04-1 Production Contro
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Appendix T: Massachusetts Asphalt R
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°C per hour. 6. Mechanical Blender
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Appendix U: China Asphalt Rubber Sp
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g/cm 3 . It should not contain stee
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S16 0~3 100 80~100 50~80 25~60 8~45
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矿料间隙率VMA (%) 不小于 19
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试件击实温度 160~170 试件
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初压开始温度 breakdown roller
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压路机类型 Type of Roller 静
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0.075mm ±2 ≤ 2.36mm 逐盘在线
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Blend Composition: 13.0% - 12.5mm A
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Percent Passing 100 90 80 70 60 50
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Draft 9-25-2011 % Air Voids 9.0 8.0
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Draft 9-25-2011 VFA 90.0 85.0 80.0
Page 223:
Draft 9-25-2011 218
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