Bitumen Softening Point Test
Softening Point denotes the temperature at which the Bitumen attains a particular degree of Softening under the specified condition of test.
The test conducted by using Ring and Ball apparatus. A brass ring containing test sample of bitumen is suspended in liquid like water or glycerin at a given temperature. A steel ball placed upon the bitumen sample and the liquid medium heated at a rate of 50C per minute. Temperature is noted when the softened bitumen touches the metal plate which is at a specified distance below.
Generally, higher softening point indicates lower temperature susceptibility and is preferred in hot climates.
The Diagram shows Softening Point Test Process below.