Which test of bitumen is used to determine the adhesive property of material and its ability to stretch (elasticity)?

Explanation:

Ductility Test for Bitumen

The ductility test is performed to determine the adhesive property of bitumen and its ability to stretch (elasticity). The test involves measuring the distance to which a standard briquette of bitumen can be stretched before breaking. This is crucial for applications where the bitumen is subjected to deformation and needs to maintain its integrity without cracking.

Analyzing the Given Options

1. Ductility test 

   • The ductility test is directly related to measuring the adhesive property and elasticity of bitumen, making it the correct answer.

2. Solubility test 

   • The solubility test determines the purity of bitumen by checking its solubility in carbon disulfide or trichloroethylene, but it does not measure adhesive properties or elasticity.

3. Softening point test 

   • The softening point test measures the temperature at which bitumen softens, which is important for understanding its performance at high temperatures but does not measure its adhesive property or elasticity.

4. Spot test 

   • The spot test is used to determine the presence of deleterious materials in bitumen but does not measure its adhesive properties or elasticity.

Conclusion

Based on the analysis of the options, Ductility test is the correct answer as it is specifically designed to determine the adhesive property of bitumen and its ability to stretch (elasticity).