9 TEST TO CHECK QUALITY OF BITUMEN FOR USE IN ROAD WORK ...
Sep 11, 2015· The test is 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 is placed upon the bitumen sample and the liquid medium is heated at a rate of 5 0 C per minute. Temperature is noted when the softened bitumen touches the ...