Superpave Asphalt Binders
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1 Superpave Asphalt Binders Aging and what they mean to the specification John D Angelo D Angelo Consulting, LLC johndangelo@dangeloconsultingllc.com
2 Stiffness (Response to Load) elastic viscous elastic solid viscous fluid Temperature, C
3 Superpave Asphalt Binder D Angelo Consulting Specifications Performance-Based to minimize permanent deformation (rutting) fatigue cracking (repeated load failure) low temperature cracking or single event cracking Physical Properties measured on aged binder
4 Grading System Based on Climate Performance Grade PG Accumulated days of high pavement design temp Min pavement design temp
5 CEC Avg 7-day Max, o C 1-day Min, o C How the PG Spec Works Spec Requirement Remains Constant > 230 o C < 3 Pa. 135 o C > 1.00 kpa > 2.20 kpa 20 Hours, 2.07 MPa < 5000 kpa PG 46 PG 52 PG 58 PG 64 PG 70 PG 76 PG (Flash Point) FP (Rotational Viscosity) (Dynamic Shear Rheometer) RV (ROLLING THIN FILM OVEN) RTFO Mass Loss < 1.00 % (PRESSURE AGING VESSEL) (110) 100 (110) 110 (110) (Bending Beam Rheometer) BBR Physical Hardening (Direct Tension) ORIGINAL PAV S < 300 MPa m > ( Bending Beam Rheometer) BBR S Stiffness & m - value Report Value F. Strain > 1.00 % (Dynamic Shear Rheometer) DSR G*/sin δ (Dynamic Shear Rheometer) DSR G*/sin δ DSR G* sin δ DT Test Temperature Changes RWM
6 Production Rutting Fatigue Cracking Thermal Cracking D Angelo Consulting Time DTT RV DSR BBR RTFO - aging No aging PAV - aging
7 Aging - How? Early: To simulate the aging that occurs due to construction and initial service, we are going to employ the Rolling Thin-Film Oven (RTFO). This is a standard AASHTO test method, T 240. Spec.: 85 minutes, 163 C, 400 ml of air per minute, 15 rpm
8 Rolling Thin Film Oven 163 C controls fan air jet bottle carriage
9
10 Pressure Aging Vessel air pressure temperature probe asphalt pressure vessel sample rack sample pan
11
12 Construction D Angelo Consulting Time [RV] No aging Rutting [DSR] Fatigue Cracking RTFO - aging [DTT] [BBR] PAV - aging Low Temp Cracking
13 Grading of Asphalt binder D Angelo Consulting Original PROPERTY ORIGINAL BINDER Specific Gravity Flash Point, C ( F) COC Viscosity, Pa s Dynamic Shear (G*/sin, 10 rad./sec.), kpa AASHT O TEST METHO D SPECS RESULTS by sample label info below AASHTO M 320, Table 1 Requirements (DSR s & BBR s reported above and below passing 15.6 C T 228 Report T min. 552 (289) 536 (280) 530 (276) 540 (282) 135 C T max C C T min C
14 Grading of Asphalt binder D Angelo Consulting RTFOT PROPERTY RTFOT RESIDUE AASHTO M 320 Requirements Mass Change, % (Mass Loss is reported as Negative) Dynamic Shear (G*/sin, 10 rad./sec.), kpa AASHT O TEST METHO D SPECS RESULTS by sample label info below T max C C T min. 70 C C
15 Grading of Asphalt PAV Dynamic Shear (G* sin, 10 rad./sec.), kpa Creep Stiffness PROPERTY Stiffness, MPa (60 sec.) m Value Stiffness, MPa (60 sec.) m Value Stiffness, MPa (60 sec.) m Value 19 C 4, ,230 4, C 5,790 4,810 5,940 6, C -- 6, C -18 C -24 C AASHT O TEST METHO D T 313 SPECS 300 max min max min max min. RESULTS by sample label info below AASHTO M 320 SUPERPAVE Binder Grade, PG: AASHTO M320, Table 1, Continuous PG:
16 PG Continuous Grade min. AASHTO M 320 SUPERPAVE Binder Grade, PG: AASHTO M320, Table 1, Continuous PG:
17 ASTM D 3384 Table 4 Absolute Viscosity, P 60 C D2171 1,000±200 Kinematic cst, min. PROPERTY ASTM D , Table 4 Requirements: As Received Viscosity, Flash Point, COC, C ( F) Solubility in TCE, %, min. AC-10 AC ,000± 400 1,921 1,452 2,392 2, C D D (425) 232 (450) D Specific Gravity 15. C D70 Report Report Penetration (100 g, 5 sec.), dmm Softening Point, C ( F) TEST METHOD SPECS RESULTS; Sample # 25 C D5 Report Report D36 Report Report Penetration Index 2 Annex A -1.5 to
18 ASTM D 3384 Table 4 TEST SPECS RESULTS; Sample # PROPERTY Penetration Index METHOD e AC-10.5 to AC RTFOT Residue: Mass Change, %, max. 1 Absolute Viscosity, P, Max. Ductility, cm, min (5 cm/min.) C D2171 5,000 8,000 9,245 8,016 13,513 18, C D Would you want to use this asphalt on your pavement?
19 No Control of Aging on The RTFOT PROPERTY ORIGINAL BINDER Specific Gravity Flash Point, C ( F) COC Viscosity, Pa s Dynamic Shear (G*/sin, 10 rad./sec.), kpa AASHT O TEST METHO D SPECS RESULTS by sample label info below AASHTO M 320, Table 1 Requirements (DSR s & BBR s reported above and below passing 15.6 C T 228 Report T min. 552 (289) 536 (280) 530 (276) 540 (282) 135 C T max C C T min C RTFOT as Negative) RESIDUE D AASHTO M 320 Requirements 58 C Dynamic Shear (G*/sin, C T min. rad./sec.), kpa 70 C C
20 PAV aging may not be capturing the aging issues with binders. We may need control of aging on RTFOT. D Angelo ConsultingNeeded Modification to the PG Spec
21 Discussions THANK YOU
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