I agree with David that the term, "condition the sample for 10 cycles,"
means The conditioning run is a step to work the sample prior to taking data
"for
the record." A quick solution to your dilemma is to have Bohlin come and
install Version 5.05 of their software. It does the same thing as Ver. 2.11
but also will run the Linearity Test, and can also be ran in Grade
Determination mode. The research version you mention is DOS base and more
tedious to operate, this version 5.05 you do not even have to understand
what's going on behind the scenes, just make a few choices and hit start,
and it will tell you if your test material is linear.
Horace Walker
Chevron Products Co.
Perth Amboy, NJ
> -----Original Message-----
> From: khobson@fd9ns01.okladot.state.ok.us
> [SMTP:khobson@fd9ns01.okladot.state.ok.us]
> Sent: Wednesday, January 13, 1999 2:02 PM
> To: superpave@mcfeeley.cc.utexas.edu
> Subject: RE: Stress/Strain sweep in TP5
>
> Thanks for your input Horace.
>
> What do you define "condition the sample for 10 cycles" as?
>
> The DSR's at OKDOT are:
> Paar Physcia MC100 US200 software version 1.61 for strain control
> Bohlin DSRII Software version 2.11 for strain control
> Paar Physica LS100 US200 software version 1.70 for stress control
>
> The TP5 I quoted from was June 1998. Maybe it was revised as Jack Telford
> former chairman of AASHTO SOM had circled it in our book.
>
> For the Bohlin we are just out of luck. Bohlin had left a research
> program
> on our pc that has the sweep test on it but it did not work.
>
> The stress controlled rheometer seems more complicted to setup for this
> test.
>
> Given what Horace says, for the strain controlled DSR I would:
> First condition the sample but that is a gray area to me. Erase those data
> points and then,
> make 15 intervals to take 10 data points each at 2% increments in strain
> from 2 to 30%.
>
> The Phaar Physica has a linear increase capability so it ramps from the
> beginning stress/strain
> to the end stress/strain like /| and not a constant like ---. To make 15
> intervals with 10 data points (averaged) each there would be a stepwise
> increment in stress instead of linear.
>
> To do the stepwise increment for the stress controlled rheometer the
> software would have to be modified each time.
> e.g.
> G* from the unaged original binder at 0.15kPa stress (range=0.09 to 0.15
> kPa)=1.290 kPa
> Start Stress = 0.12(G*)/6=0.0258 kPa
> End Stress = Start Stress(15)=0.387 kPa
> D1=Delta increase to make each interval stress:
> D1=(0.387-0.0258)/15=0.02408
> Interval 1 stress would be start stress=0.1548 kPa
> Interval 2 stress = start stress + (Interval-1)D1=
> 0.1548+(1)0.02408=0.1789
> kPa
