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Determination of Viscosity of the Bitumen

AIM OF THE EXPERIMENT
To determine the viscosity of bituminous material.

CODE OF REFERENCE


APPARATUS USED

Saybolt Viscometer to determine viscosity of bitumen
Fig 1: Saybolt Viscometer
COURTESY: HEICOIN

THEORY
Viscosity is the inverse of fluidity and it is a measure of resistance of flow. The viscosity of liquid bitumen is measured by efflux visconnectors. At low viscosity the bitumen binder simply lubricates the aggregate particles instead of providing a binder action. In case of high viscosity it will resist the compactive effort but mixture is heterogenous. Furol viscosity is a specific test which is only used for the measurement of liquid bituminous materials.

The Saybolt Universal Second (S.U.S) is a measure of kinematic viscosity. It is the time required for 60 ml of oil to flow through a calibrated tube at a controlled temperature. It is used when the oils have flow time upto 5600 seconds.

When the flow time is in excess of 5600 seconds, Saybolt Furol Seconds should be used instead of Saybolt Universal Second. The tube diameter in two scales is such that the Furol Viscosity is one-tenth of Universal Viscosity.

In this test, the efflux time required for 60 ml of sample to flow through the calibrated tube is recorded and it is multiplied by a suitable factor called the orifice factor and the result is reported as the viscosity of the sample at a given temperature in which the test will be conducted.

RELEVANCE OF THE EXPERIMENT

PROCEDURE

OBSERVATIONS AND RESULTS
i. Test temperature= 25o C
ii. Time taken to flow 50 c.c of binder=
iii. Viscosity=
iv. The viscosity of bituminous material is ____________.
v. The kinematic viscosity of given sample is ___________.

DISCUSSION

PRECAUTIONS

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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