relation between pen & viscosity
relation between pen & viscosity
(OP)
Hi,
there's someone that can explain me something about blending,recutting, "viscosity blending number"(VBN) and evenctually if there's some kind of relation similar to "penetration=f(VBN,?)"or some info related to it?
Thanks a lot also for reply to a part of this long question.
Best regards.
there's someone that can explain me something about blending,recutting, "viscosity blending number"(VBN) and evenctually if there's some kind of relation similar to "penetration=f(VBN,?)"or some info related to it?
Thanks a lot also for reply to a part of this long question.
Best regards.





RE: relation between pen & viscosity
Best regards.
gelpino
RE: relation between pen & viscosity
PEN relates to a method of measuring the viscosity and is, as such, a historical measure. Viscosity is measured in the laboratory by alternative technologies such as the cone and plate viscometer which, with a density measurement, will enable the determination of the kinematic viscosity. http://www.research-equipment.com is the web site for a company specialising in cone and plate viscometers and who may have access to similar data.
Viscosity can be very efectively measured on line using digital viscometer systems which exploit the temperature viscosity relationship from ASTM D341. This gives the kinematic viscosity at reference temperatures. Some US users (referred to in the US as Asphalt)have declared the accuracy to be the equal or better than the laboratory (therefore presuming they have established this from a statistical evaluation of the laboratory results as per API 555 (or 554?) This method is used for blending control i.e. to control the addittion of cutter stock to the base stock. In blending control systems using dual viscometers the Viscosity index s also determined. In simpler applications using single viscometers the viscosity index is not available.
If you would like more information on process measurement, please let me know.
RE: relation between pen & viscosity
From that, you 'could' create a relationship. But, I don't work with asphalts to know for a specific pen, how much variation in viscosity there would be depending on the crude used to make the asphalt.
RE: relation between pen & viscosity
If u want share documents plz send to gelpino@yahoo.it.
Surely it would be interesting to find that shell paper or some similar reference. At this point I wish at least to know about theories useful for this study. Everything is glad.
Best regards
gelpino
RE: relation between pen & viscosity
V=[(1,59*10^10)/P^2.16]
for purely viscous asphalts (Newtonian)in agree with theoretically deduced formula
al + 0.5bl^2 = PT/V
with a =constant denoting the resistance of the penetration needle, and l= the depth of penetration in cm, and b =constant for needle resistance calculated to be 2,10 for needle standardized by ASTM, T duration of load in seconds, P penetration and V viscosity.
It's a starting point!
gelpino
RE: relation between pen & viscosity
log Pblend=a logA +(1-a)log B
a, b=1-a, are the proportions; A, B are the components' penetrations, respectively.
Semi-log graphs could be used with straight lines connecting the log ordinates. The linear abscissa has the w/w% of the components. Ditto for the blending of R&B Softening Points, oC.
A word of caution: best results are obtained by lab testing to determine the right proportions.
As to the viscosity limits associated with various applications:
For pumping, a maximum of 2000 cSt
For mixing processes, 150 to 300 cSt
For spraying, 50 to 200 cSt
RE: relation between pen & viscosity
gelpino
RE: relation between pen & viscosity