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Dynamic viscosity test

As with common paving bitumens, the tests conducted on hard paving bitumens aim at determining their consistency at intermediate service temperatures (penetration test) and at elevated service temperatures (softening point and dynamic viscosity test) and their durability (resistance to hardening test). Kinematic viscosity, Fraass breaking point, flash point and solubility are also properties considered useful in the specification of hard paving bitumens. [Pg.104]

A detailed description of the test for the determination of the dynamic viscosity test by vacuum capillary viscometers is given in CEN EN 12596 (2007), ASTM D 2171 (2010) or AASHTO T 202 (2010). [Pg.185]

The dynamic viscosity test is part of the framework for specifying requirements by EN 13308 and is performed in accordance with CEN EN 13302 (2010). A brief description of the test is given in Section 4.8.2. [Pg.201]

The dynamic viscosity test determined by a rotating spindle viscometer (rotational viscometer test) is also covered by ASTM D 2196 (2010). [Pg.201]

Rheometric Scientific markets several devices designed for characterizing viscoelastic fluids. These instmments measure the response of a Hquid to sinusoidal oscillatory motion to determine dynamic viscosity as well as storage and loss moduH. The Rheometric Scientific line includes a fluids spectrometer (RFS-II), a dynamic spectrometer (RDS-7700 series II), and a mechanical spectrometer (RMS-800). The fluids spectrometer is designed for fairly low viscosity materials. The dynamic spectrometer can be used to test soHds, melts, and Hquids at frequencies from 10 to 500 rad/s and as a function of strain ampHtude and temperature. It is a stripped down version of the extremely versatile mechanical spectrometer, which is both a dynamic viscometer and a dynamic mechanical testing device. The RMS-800 can carry out measurements under rotational shear, oscillatory shear, torsional motion, and tension compression, as well as normal stress measurements. Step strain, creep, and creep recovery modes are also available. It is used on a wide range of materials, including adhesives, pastes, mbber, and plastics. [Pg.202]

A series of different hydroxyfunctional hyperbranched polyesters (H1-H6) with increasing ratio TMP bis-MPA was studied. The tests were made on samples quenched from melt. As discussed previously, the molar masses for these polymers are difficult to determine and the results ate therefore presented as a function of the ratio bis-MPA TMP, which can be directly related to the theoretical molar mass. The complex dynamic viscosity (r ) of hyperbranched polyesters show an increase in viscosity with size which levels out at a certain value (Figure 11). The corresponding linear polymers would exhibit a linear relationship q versus log molar mass and hence have a higher melt viscosity. The hydroxyfunctional polyesters exhibit a Newtonian behavior within a medium shear range (10 -10 rad s ). [Pg.19]

The bulk rheological properties of the PFPEs, including the melt viscosity (p), storage modulus (G ), and loss modulus (G"), were measured at several different temperatures via steady shear and dynamic oscillation tests. Note that we denoted p as melt viscosity and r as solution viscosity. An excellent description of the rheology is available in Ferry [99]. [Pg.20]

Model tests employed to determine scale-up rules are, of course, performed with the same material system as that used in the prototype. This is because any alteration of a physical characteristic, e.g. the dynamic viscosity, automatically changes other physical properties, e.g. electrophoretic mobility, i. [Pg.174]

A common feature observed was the departure between the steady shear viscosity ( 7a) and the real component of the dynamic viscosity (/ ) at large values of shear rate and frequency, with the expected more rapidly decrease of t] with frequency than rja does with shear rate (Bird et al., 1977a), which can be attributed to the very different molecular motions involved in the dynamic and steady shear at high m and y (Ferry, 1980). Because of the relatively high value of strain amplitude used in our tests (36%) and the two-phase nature of our HM dispersions, the observations with respect tor) and t)a are in agreement with those of Matsumoto et al. (1975). [Pg.167]

Houskaet al. (1998) determined the relationships for five sensory methods of oral and non-oral viscosity evaluation between viscosity scores and instrumentally measured dynamic viscosity for Newtonian fluid foods of low and medium viscosities. From those relationships, the effective shear rates for the five the sensory tests were estimated. Highest shear rates were predicted for viscosity perception by compression of samples between tongue and palate, and the lowest for pouring the fluid foods from a teaspoon. Mixing with a teaspoon, slurping and swallowing exhibited nearly... [Pg.408]

Viscosity. It shall be detd in accordance with method 305.6 of Federal Test Method Std 791B (Jan 1969) (ASTM Method D445-65). The time is measured for a fixed vol of the liq to flow thru a calibtated Ubbelohde capillary viscometer under an accurately reproducible head and at a closely controlled temp. The kinetic viscosity is then calculated from the measured time flow and the calibration constant of the viscometer. Kinetic viscosity is a measure of the time for a fixed vol of liq to flow by gravity thru a capillary. It is usually expressed in centistokes, cSt, so that 1 St = 100 cSt. The dynamic viscosity is the product of kinematic viscosity density of the liq, both at same temp. The unit is poise, P, in g/cm/sec [For details see ASTM Standard, Part 17(1971), ppl78—83]... [Pg.309]

Rheology is a powerful method for the characterization of HA properties. In particular, rotational rheometers are particularly suitable in studying the rheological properties of HA. In such rheometers, different geometries (cone/plate, plate/plate, and concentric cylinders) are applied to concentrated, semi-diluted, and diluted solutions. A typical rheometric test performed on a HA solution is the so-called "flow curve". In such a test, the dynamic viscosity (q) is measured as a function of the shear rate (7) at constant strain (shear rate or stress sweep). From the flow curve, the Newtonian dynamic viscosity (qo), first plateau, and the critical shear rate ( 7 c), onset of non-Newtonian flow, could be determined. [Pg.857]

Here it can be seen that the response is highly non-linear since the dynamic viscosity is dependent on the strain amplitude. Thus any further testing assuming linear viscoelastic behaviour is not possible for this system under these conditions. [Pg.322]

Dynamic properties ASTM 4065-90 ASTM 4473-90 Viscoelastic properties Gel point from crossover tests and time for dynamic viscosity to reach 100Pas For supported and unsupported resins Isothermal and non-isothermal tests... [Pg.337]

ASTM D445, Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids—The Calculation of Dynamic Viscosity, ASTM Annual Book of Standards, vol. 05.0 (West Conshohocken, PA American Society for Testing and Materials). [Pg.42]

Several researchers reported viscoelastic behavior of yeast suspensions. Labuza et al. [9] reported shear-thinning behavior of baker s yeast (S. cerevisiae) in the range of 1 to 100 reciprocal seconds at yeast concentrations above 10.5% (w/w). The power law model was successfully applied. More recently, Mancini and Moresi [10] also measured the rheological properties of baker s yeast using different rheometers in the concentration range of 25 to 200 g dm. While the Haake rotational viscometer confirmed Labuza s results on the pseudoplastic character of yeast suspension, the dynamic stress rheometer revealed definitive Newtonian behavior. This discrepancy was attributed to the lower sensitivity of Haake viscometer in the range of viscosity tested (1.5 to 12 mPa s). Speers et al. [11] used a controlled shear-rate rheometer with a cone-and-plate system to measure viscosity of... [Pg.47]

Dynamic-mechanical testing of suspensions is particularly suitable for studying systems with anisometric particles with well-defined structures [Ganani and Powell, 1985]. The authors studied the dynamic behavior of spheres in a Newtonian liquid. They reported that dynamic viscosity, T) , behaves similarly to the steady state viscosity, T), while the storage modulus G = Nj = 0. [Pg.467]

Ap = pressure drop 1 = dynamic viscosity S = test piece thickness... [Pg.398]

In Germany, standards have been published describing the Compression Shear Test (DIN 54452), Dynamic Viscosity Determination of Anaerobic Adhesives by Rotational Viscometer (DIN 54453), Initial Breakaway Test at Bonded Threads (DIN 54454), and Torsion Shear Test (DIN 54455). DIN 54455 is particularly interesting since it is one of a very few tests in which a nut and bolt (MIO) are seated to a measured torque before the anaerobic sealant is allowed to cure. [Pg.758]


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See also in sourсe #XX -- [ Pg.9 ]




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