It is extended to a distance within 5 mm of the walls of the water bath.Īn insulating handle to facilitate rotation of stirrer, a swivelled support for the valve, and support for thermometer are present on this curved shield. Curved shield: It is fixed at the upper edge of the cylinder. To prevent the water from the water bath from entering the tar cup on raising the stirring system, vertical grooves are provided on the inner surface of the cylinder. The cylinder is cut between the vanes so that heat can be transferred from water in the bath to the tar in the cup. The stirrer is mounted on a cylinder slipping on the sleeve through an easy sliding fit. The upper and lower portions of the stirrer can be turned in opposite directions. It helps in receiving the cup so that the cup remains in position. Sleeve: It is in the form of a stout brass tube, which is bronzed into a central hole cut in the bottom of the water bath. It helps in closing the orifice attached to the 10-mm cup.ĥ. It is attached to a metal rod provided with a levelling peg at upper part and hemisphere by which the valve is held. Valve: It is in the shape of a sphere and is made up of phosphor-bronze. The legs are of such length that a 100-mm cylinder can be placed below the cup orifice.Ĥ. The water bath is placed on three equidistant legs riveted to the wall of the bath. Heating of the bath is done electrically. Water bath: It is cylindrical in shape and is made of a copper sheet. If the upper rim of the orifice is not perfectly circular, then the valve cannot be properly seated.ģ. The extension is drilled and polished to form an orifice of 10 mm diameter. The plate helps in the drainage of tar after use. It has centrally-located extensions made up of same material and cylindrical in shape. While a phosphor-bronze plate which is circular in shape is screwed into the cylinder and made conical. The collar helps in supporting the cup in the sleeve of the water bath. It has an external brass collar at the upper open end of the cylindrical cup. Cup: It is also known as a 10-mm cup and has a specified orifice and valve. Tar viscometer is used for determining industrial viscosity of bitumen whose parts are discussed below: Tar ViscometerĢ. Apparatusįollowing apparatus are used in the viscosity of bitumen test-ġ. Industrial viscosity: It is the property of a fluid by virtue of which it is able to resist the flow caused by internal friction. Important Terms related to Industrial Viscosity Test of Bitumen The industrial viscosity of bitumen is measured by determining the time taken by 50 cm 3 volume of material to flow from a cup through a specified orifice in standard conditions of temperature and a specified temperature. ![]() To determine the industrial viscosity of bitumen, road tar, and cutback bitumen’s. Therefore, it is essential to select a binder with appropriate viscosity so that it can form a uniform coat and fill up the voids between aggregates effectively. Workability will also be affected of a highly viscous bitumen specimen. It will not help in the binding of the particles which is its primary purpose.Ī highly viscous binder will restrict the flow, thus it restricts the ability of binder to spread and fill up the voids between the aggregates during pavement construction.Īlso, it will require more efforts comparatively, and there is also a possibility of it forming a heterogeneous mix. If the bituminous binder used in the pavement has much lower viscosity value, then it will act as a lubricant only. It ensures the quality of the bitumen used as a binder by giving a measure of fluidity at a particular temperature. Viscosity measures the degree of fluidity of the bitumen sample. Viscosity test of the bitumen sample is one of the important tests on bitumen to be conducted before road construction. Significance of Viscosity Test of Bitumen Conclusion of Viscosity Test of Bitumen:.Summary of the Kinematic Viscosity Test of Bitumen.Kinematic Viscosity of Bitumen Test Procedure:.Important Terms related to Kinematic Viscosity Test of Bitumen.Summary of Absolute/Dynamic Viscosity Test of Bitumen. ![]() Absolute Viscosity of Bitumen Test Procedure:. ![]()
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