Viscosity Analysis Report Example

A series of viscosity measurements were conducted on two specimens, one for 90% BSS modified binders, other is for the Neat asphalt, both of them have the same process but different temperature but same rpm. For BSS viscosity measurement, shearing was applied using spindle V-73 at a speed of 1, 2, 3, and 4 rpm. Viscosity measurement was conducted using Brookfield Viscometer (ASTM D4402). In this test, the viscosity, torque, and shear stress are determined while applying a rotational shear on the specimens. To prepare specimens, 10.5 grams of 90 bitumen scrap shingle sample was poured into aluminum chamber. The thermoset was preheated at its designated temperature for 45 minutes. Samples and the spindle were preheated in an oven for 45 minutes at 180 C before being placed into the aluminum chamber in thermoset. After loading the sample, an additional 30 minutes waiting time was used to ensure thermal equilibrium. The replicate was used for each test temperature and the average of the three values was recorded as the viscosity at the specified temperature and speed. For the neat binder the thermoset was preheated in an …show more content…
The magnitude of the VTS is directly proportional to the temperature susceptibility of the binder (Rasmussen et al. 2002). The VTS values were reported to range from −3.35 to −3.84 (U.S. DOT 2011), which is almost consistent with values of −3.36 to −3.98 reported by Rasmussen et al. and Puzinauskas (Rasmussen et al. 2002 and Puzinauskas 1967).

Shear susceptibility
Shear susceptibility is the rate of change in viscosity with the shear rate (Roberts et al. 1996). The shear susceptibility is determined by calculating the slope of the line formed by a log of shear rate versus the log viscosity graph by using the following equation (Raouf and William 2010).

4. Results and