250 Min. PRECISION. Repeatability 7 % of their mean 350 Min. The following testing equipment is needed to measure absolute viscosity of viscosity graded paving bitumen (IS:73-2006) at 60 C in accordance with IS:1206 (Part 2) (similar to ASTM D 2171), which uses a vacuum capillary viscometer. Objective • To become familiar with the term viscosity, its influence and effects, its techniques and application in the field of engineering especially for design of the road pavements. 3- Therefore viscosity at 135oC is a true reflection of the quality of bond that is likely to be formed with the aggregate. 1- Too viscous bitumen would result in inadequate and non-uniform coating of the aggregates. 220 Min. For example, viscosity at 60°C, 30 cm Hg Vacuum in poises. Very low viscosity would again result in inadequate coating as the bitumen will tend to bleed. 220 Min. 1600 Min. 300 Min. 3200 Kinematic Viscosity at 135°C, cSt 1206 (Part 3) Min. The viscosity of a cutback can be measured with either 4.0 mm orifice at 25$^o$ C or 10 mm orifice at 25 or 40 C. The viscosity expressed in seconds is the time taken by the 50 ml bitumen material to pass through the orifice of a cup, under standard test conditions and specified temperature. 800 Min. 2- Very low viscosity would again result in inadequate coating as the bitumen will tend to bleed. VISCOSITY TEST FOR BITUMEN PRESENTED BY:AMRIT PANDIT ACEM/069/A/005 KATHMANDU, NEPAL 2. BITUMEN (VISCOSITY GRADES) TEST BIS METHOD SPECIFICATION VG10 VG20 VG30 VG40 Absolute Viscosity at 60°C, Poises 1206 (Part 2) Min. 2400 Min. 5.2 Some asphalts may exhibit non-Newtonian behavior under the conditions of this test method, or at temperatures within the range of this test method. Always report the test temperature and vacuum with the viscosity test results. The second test results of sample should not differ by more than the following: 1. SIGNIFICANCE OF VISCOSITY TEST: Too viscous bitumen would result in inadequate and non-uniform coating of the aggregates. ABSOLUTE VISCOSITY OF BITUMEN AS PER IS 1206 PART II. Some of the tests have evolved with the development of the industry and are empirical methods. 220 Min. Viscosity test of bitumen 1. Experience in using bitumen in engineering projects has led to the adoption of certain test procedures that are indicative of the characteristics that identify adequate performance levels. Consequently it is essential that they are carried out in strict compliance with the 400 Flash Point (Cleveland Open Cup,) °C 1209 Min. 220 Therefore viscosity at 135oC is a true reflection of the quality of bond that is likely to be formed with the aggregate. Significance of viscosity test.