CRM. Photomicrographs of CMCRA Transmitted and Fluorescent Light. Gap study Several 10% blends with 30 and 60 mesh binders.
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1 CONFERENCE LAHOMA CITY, Development of a CRM Binder Performance Spec. John D Angelo D Angelo Consulting, LLC Gaylon Baumgardner Paragon Technical Services CRM Photomicrographs of CMCRA Transmitted and Fluorescent Light Historically testing has been done with pen and vis. Viscosity was mostly rotational or vane shear. CRM DSR GAP Study Several 10% blends with 30 and 60 mesh binders Two binders -28 and Minimum 10% CRM actual formulation unknown Two gap openings tested, 1mm and 2mm. Gap study Several 10% blends with 30 and 60 mesh binders base and CRM size Lion -22, 850 µm, 160 C Lion -22, 850 µm, 177 C Lion -22, 850 µm, 193 C Lion -22, 850 µm, 210 C Lion -22, 600 µm, 210 C Lion -22, 250 µm, 210 C Source A, 250 µm, 210 C Source B, 250 µm, 210 C Source C, 250 µm, 210 C Source D, 250 µm, 210 C Source E, 250 µm, 210 C Source F, 250 µm, 210 C 1
2 CONFERENCE LAHOMA CITY, Comparison of measurements at 1 and 2 mm gaps G*/sinδ, 1 mm Gap (kpa) C Linear (Line of Equality) G*/sinδ, 2 mm Gap (kpa) Terminal Blended CRM GAP study Test Temp., C Jnr % rec % Change Jnr Asphalt ID Gap PG -28 1mm PG -28 2mm % Rec Jnr % Rec comparison Gap testing Comparison 1mm 2mm 52, 58,, 70, 76C Jnr 1/kPa 28 1mm gap 28 2mm gap Terminal Blend CRM Gap Study Test Temp., C Jnr % rec % Change Jnr Asphalt ID Gap PG mm PG mm * Terminal Blend CRM Gap Study % Rec Gap testing Comparison 1mm 2mm 52, 58,, 70, 76C Jnr 1/kPa mm gap mm gap Terminal Blend CRM Gap Study DSR requirement that particles be less than ¼ gap size works for CRM also. Binders tested would meet Jnr and % Recovery requirements, but both binders showed stress sensitivity. Stress sensitivity results marginal so minor adjustment of formulation could bring within requirements. 2
3 CONFERENCE LAHOMA CITY, How to handle larger CRM 60 mesh material is easily handled in 1 mm gap. 20 mesh material may require 4 mm gaps. What is the limit of gap size? Are other geometries available to test larger particles? Jnr of a PG gaps GAP(mm) TEMP ( C) COMPLEX MODULUS (kpa) Jnr (1/kPa) % Recovery GAP(mm) TEMP ( C) COMPLEX MODULUS (kpa) Jnr (1/kPa) % Recovery mm Gap Trial Objective Identify suitable testing methods for GTR under the Superpave procedures Using smooth parallel plates for testing Concerns Large gap requirements due to large particle size Trimming of parallel plates Sedimentation of particulates Deformation of Asphalt at geometry surface, rather than entire volume of GTR sample Geometries Used Parallel Plate Parallel Plate Plate Diameter: 12.5 mm Gap: 1 mm Couette Set (Cup and Bob) Cup Diameter: 27.5 mm Bob Diameter: 14 mm Effective Gap: 6.75 mm Vane 14mm Set (Cup and Vane) Cup Diameter: 27.5 mm Vane Diameter: 14 mm 3
4 CONFERENCE LAHOMA CITY, Cup & Bob Vane & Cup Top View Top View Malvern Instruments Instrument Used Kinexus Pro Rheometer Active Heated Chamber Used with 25mm parallel plates Samples tested Control Modified Original Binder GTR RTFO % GTR 20 Mesh Peltier Cylinder Cartridge Used with Cup & Bob and Cup & Vane Control Tested with Various Geometries AASHTO T-315 GTR Tested with Various Geometries AASHTO T-315 Temperature: 70.0 C 25mm Bob 14mm Vane 14mm Temperature:.0 C Vane 14mm Bob 14mm Temperature: 76.0 C 25mm Bob 14mm Vane 14mm 4
5 CONFERENCE LAHOMA CITY, Control C Cycle 1 with All 3 Geometries AASHTO TP-70 (MSCR) 100Pa Results AASHTO TP-70 (MSCR) 3200Pa Results New Geometry Evaluation Preliminary testing indicates that new geometry may give similar results. More extensive evaluation is needed to fully validate geometries. Multiple grade binders Full PG grading and MSCR Validation Experiment for Cup and Bob and Vane Binders -22, SBS, 70-22PPA Master curves with PG -22 Full PG binder grading and MSCR for all three binders. G*, Pa 1.0E E E E E E+03 G* Master Curves for -22 with different geometries G*, Cup & Bob G*, Parallel Plate G*, Cup and Vane G*, Cup and Bob (20min) 1.0E E E E E E E E E E E E E E E E E E E+06 Freq., Hz 5
6 CONFERENCE LAHOMA CITY, Phase angle degrees δ Master Curves for -22 with different geometries d, Cup & Bob d, Parallel Plate d, Cup and Vane Evaluation of New Geometries Plate Pate provides similar results to cub and bob. Cup and vane will require unique calibration for individual binders and may not be ideal for specification testing d, Cup and Bob (20min) E E E E E E E E E E E E E E E+06 Freq., Hz Rubber Grading Experiment for Cup and Bob and Vane Binders -22, 76-22, 70-22PPA Full PG grading and MSCR; PP1, PP2, CB, CV -22, 30 mesh rubber 10%, 15% Full PG grading and MSCR; PP2, CB, CV -22, 20 mesh rubber 15%, 20% Full PG grading and MSCR, CB, CV mesh rubber 10%, 15% Full PG grading and MSCR, PP1, PP2, CB, CV ALF AC rubber Full PG grading and MSCR, CB, CV ALF Terminal blend Full PG grading and MSCR, PP1, CB, CV DSR G*/sinδ Min 1.0 Standard MSCR3.2 <4.0 Heavy MSCR 3.2<2.0 Very heavy MSCR3.2 <1.0 S grade DSR G*sinδ Max 5000 H & V grade DSR G*sinδ Max 6000 New CRM spec to match MSCR Binder Spec Original RTFOT [(MSCR3.2 MSCR 0.1)/ MSCR 0.1] <.75 PAV Low temp BBR and DTT remain unchanged Summary Control for all plate plate and cup and bob geometries showed similar results for T-315 and TP-70 at 2 different temperatures Trimming of samples not required when using cup and bob/vane geometries GTR at C exhibited differences between the Bob and Vane geometries Accurate measurements can be generated if sedimentation of particulates occur during the test when using Bob and Vane geometries Summary CRM binder is sensitive to crude source. Rubber size will effect test results. Particles should be ¼ gap size or less. Careful formulation is needed to meet all Jnr specs, but it can be done successfully. CRM Binders can be produced to meet PMA specs. Large CRM particle sizes can be tested in DSR 6
7 CONFERENCE LAHOMA CITY, Summary There may be some differences for CRM binder spec and PMA Spec Solubility for CRM binder may be different. Stress sensitivity may be different. Most other properties will be the same. Thank You 7
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