Determining the ductility of bitumen
- 1. 10/3/2016 Determining the Ductility Of Bitumen http://www.engineeringcivil.com/determiningtheductilityofbitumen.html 1/8 Determining the Ductility Of Bitumen Posted in Civil Engineering Tests | Email This Post | Like 20 This test is done to determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per IS: 1208 – 1978. The principle is : The ductility of a bituminous material is measured by the distance in cm to which it will elongate before breaking when a standard briquette specimen of the material is pulled apart at a specified speed and a specified temperature. The apparatus required for this test: i) Standard mould ii) Water bath iii) Testing machine iv) Thermometer – Range 0 to 44oC, Graduation 0.2oC Procedure to determine the Ductility Of Bitumen i) Completely melt the bituminous material to be tested by heating it to a temperature of 75 to 100oC above the approximate softening point until it becomes thoroughly fluid. Assemble the mould on a brass plate and in order to prevent the material under test from sticking, thoroughly coat the surface of the plate and the interior surfaces of the sides of the mould with a mixture of equal parts of glycerine and dextrin. While filling, pour the material in a thin stream back and forth from end to end of the mould until it is more than level full. Leave it to cool at room temperature for 30 to 40 minutes and then place it in a water bath maintained at the specified temperature for 30 minutes, after which cut off the excess bitumen by means of a hot, straight edged putty knife or spatula, so that the mould is just level full. ii) Place the brass plate and mould with briquette specimen in the water bath and keep it at the specified temperature for about 85 to 95 minutes. Remove the briquette from the plate, detach the side pieces and the briquette immediately. iii) Attach the rings at each end of the two clips to the pins or hooks in the testing machine and pull the two clips apart horizontally at a uniform speed, as specified, until the briquette ruptures. Measure the distance in cm through which the clips have been pulled to produce rupture. While the test is being done, make sure that the water in the tank of the testing machine covers the specimen both above and below by at least 25mm and the temperature is maintained continuously within ± 0.5oC of the specified temperature. REPORTING OF RESULTS A normal test is one in which the material between the two clips pulls out to a point or to a thread and rupture occurs where the crosssectional area is minimum. Report the average of three normal tests as the ductility of the sample, provided the three determinations be within ± 0.5 percent of their mean value. If the values of the three determinations do not lie within ± 0.5 percent of their mean, but the two higher values are within ± 0.5 percent of their mean, then record the mean of the two higher values as the test result.
- 2. 10/3/2016 Determining the Ductility Of Bitumen http://www.engineeringcivil.com/determiningtheductilityofbitumen.html 2/8 More Entries : Determining The Marshall Stability of Bituminous Mixture Determining Penetration of Bitumen Determining Specific Gravity of Bitumen Determining Flash And Fire Point Of Bitumen Determining Softening Point Of Bitumen Test To Check Soundness Of Cement How do paver, steelwheeled roller and pneumatic tire rollers carry out compaction? Determine The Maximum Dry Density And The Optimum Moisture Content Of Soil Comments Nilotpal Sengupta August 27, 2009 at 5:24 am Why ductility of bitumen needs to be determined? What is the engineers interest for doing this test? Reply Link Quote MANISH July 26, 2010 at 12:57 pm actually a layer of bitumen is spread over the sub surface grade layer .if the bitumen is ductile only then it can be heated to temperature of around 70 degree celcius and can be mixed with the sublayer. from engineers point of view it is important otherwise if bitumen is not ductile then it can break during summers and there will be cracks on the road. Reply Link Quote hemanth November 25, 2009 at 11:44 pm Ductility of bitumin is required to know how longer lt can spread while we pouring the bitumin……higher the ductility more area can be covered Reply Link Quote ANSHUMAN August 10, 2010 at 12:02 pm Ductility is a measure of Breaking resistance or Cracking resistance of a Bitumen During Summer. Reply Link Quote deny August 16, 2012 at 6:58 am AAC Plant AAC Block Produc... AAC Production Line Manufacturer Engaged in AAC more than 10 years Junwei Yang What is Marshall Mix Design for Bituminous... Concrete Mix Design – M 20 Grade Of Concrete Cross Bars at Column More Useful Measurement Units Workability of Fresh Concrete by Slump Test Test To Check Soundness Of Cement Determining The Marshall Stability of Bituminou... Sieve Analysis of Aggregates