evaluation of asphalt using lap shear specimens - Petersen Asphalt ...

EVALUATION OF ASPHALT USING LAPSHEAR SPECIMENS•TECHNICAL PAPER PRESENTED AT THE PETERSENCONFERENCE JUNE 2005Cheyenne, Wyoming

SPLIT TENSILE STRENGTH LIMESTONE806040202.0%A1.5%ACONT.POLYMER LEVELWETDRY0

SPLIT TENSILE STRENGTH LIMESTONE806040202.0%A1.5%APOLYMER LEVELCONT.WETDRY0

SPLIT TENSILE ON WATSONVILLE GRANITE2502001501005002.5%APOLYMER LEVEL5%BWETDRY

SPLIT TENSILE STRENGTH LIMESTONE2.0%A1.5%ACONT.WETDRY80706050403020100

SPLIT TENSILE ON WATSONVILLE GRANITE250200150100500DRYWETAC153%AA+CaO

A PLUS CATALYSTA PLUS CATALYSTPAV BBR m-34G* / sin (d) unaged8282120/1501.5 % A + CAT2.0%A+CATG*/sin (d) RTFO-34PAV BBR13PAV-DSR G*sin(d)

ASPHALT PREPARATIONASPHALT PREPARATION• POLYMER BLENDED AND OR REACTED• RTFO RESIDUE OBTAINED USING STD CYCLE

SAMPLE PREPARATIONSAMPLE PREPARATION• GLASS SLIDES 3 INCHES X 1 INCH• CLEANED AND DRIED• HEATED TO 140 C• OVERLAPPED I INCH• 1 TO 1.2 GRAMS OF HOT ASPHALT APPLIED• SAMPLES SHIMMED TO 1.6 mm• 1 kg WEIGHT PLACED ON SAMPLE• SAMPLED ALLOWED TO COOL• TRIMMED AT EDGES

TENSILE LAP SHEAR METHODTENSILE LAP SHEAR METHOD• MASKING TAPE PLACED AROUND GLASS• PLACED IN ENVIRONMENTAL CHAMBER OFTENSILE TESTER• PULLED AT RATE OF 0.2 INCHES/ MIN.• CHART SPEED OF 1 INCH / MIN• LOW TEMP. PROPERTIES DONE ON METAL

ERROR BARS FOR LAP SHEAR TEST2520PS I151050CONTROL 4% B 1.75% A 2.25% AASPHALT COMPOSITION

LAP SHEAR VERSUS TEMPERATURE252015105CONTROL4% B1.75A2.25A23 29 35 41 47TEMPERATURE °C

LAP SHEAR STRENGTH VERSUSTEMPERATURE10010CONTROL4% B1.75A2.25A10.10.0123 29 35 41 47TEMPERATURE DEGREES C

LAP SHEAR VERSUS TEMPERATURE1000100101CONTROL4% B1.75% A2.25% A0.10.010.0010 12 18 22 28 34 40 46 52 58 64TEMPERATURE C

SHEAR STRENGTH VERSUS TEMPERATURE1000100CONTROL4% B1.75% A2.25% A1010.10.010 12 18 23 29 35 41 47TEMPERATURE C

ELONGATION VERSUS TEMPERATURE40control4%B1.75% A2.25% A2000 12 18 22 28 34 40 46TEMPERATURE

LAP SHEAR VERSUS TEMPLAP SHEAR VERSUS TEMP250AFPSI.200150CFCONTROL2.25% A100500-6 0 3 6 12 18 22TEMP C

TRANSITION FROM COHESIVETO ADHESIVE FAILURE• TRANSITION HAPPENS AT 6 TO 0 DEGREES C• GLASS SLIDES BREAK AT ABOUT THIS TEMP.• METAL SPECIMENS MORE FORGIVING

LAP SHEAR VS. TEMP. (Metal)250200150100Cont.2.25% A500-6036°C

% ELONG. VS. TEMP. (METAL)% ELONG. VS. TEMP. (METAL)100101Cont.2.25% A0.1-6036°C

METAL RESULTSMETAL RESULTS• TRANSITION FROM CO TO AD BETWEEN 0AND MINUS 6 C

Lap Shear vs. Temp.1001010.10.0122Cont.4% E2% R2.25% A 34 46°C

Lap Shear vs. Temp.2010022 34 46°C2.25% A2% R4% ECont.

STRIPPING RESULTSSTRIPPING RESULTS• Begin to loose adhesion after 1 to 2 weeks• Not reflected in tensile properties

CONCLUSIONS• Lap shear specimens simple to make• Results in tensile tester are reproducible• Low temperature and high temperature dataavailable from same sample and samemachine• Shows benefits for polymer modification• Do results correlate with SHRP ?

STRUCTURE OF AMSTRUCTURE OF AMCH 3CH 2CH CH 2 CH 2 CH 2CHCH 2C2C =OC = OOOC 4 HCH 210nCHOCHm2®ELVALOY AM

REACTION OF ASPHALTENESWITH GMAOASPHALTENES-----C OHCH 2CHOCH2HO CH2O CHASPHALTENE--C-O- CH2•ADDITION REACTION•NO SIDE PRODUCTS•NO VOLATILES FORMED•STANDARD EPOXY CHEMISTRY

FUTURE RESEARCHFUTURE RESEARCH• Evaluate granite and limestone substrates• Evaluate thicker glass• Evaluate low temp properties• Look at rough surfaces

CODE• A = ELVALOY AM• B = SBS• E = EVA ELVAX 150• R = SBR