Revised Standard from Last Update.

1. Scope

1.1 This standard prescribes two methods of treatment of bitumen to predict the effect of ageing on selected properties of bitumen before and after the treatment, namely, Rolling Thin Film Oven (RTFO) test and Pressurized Ageing Vessel (PAV) test. These tests are prescribed in following two sections:

a) Section 1 - Rolling Thin Film Oven (RTFO) test (effect of heat and air on a moving film of bitumen); and

b) Section 2 - Pressurized Ageing Vessel (PAV) test (accelerated ageing of bitumen by means of pressurized air and elevated temperature).

1.2 The residues obtained from RTFO and PAV tests shall be tested for various parameters to predict the effect of ageing.

1.3 It is intended to simulate the type of changes, which occur in bituminous binders during hot mix and in service oxidative ageing but may not accurately simulate the relative rates of ageing.

NOTES:

1 The ageing of bitumen binders during service is affected by ambient temperature, air pressure and by mixtures associated variables, such as, volumetric proportions of the mix,permeability of the mix, properties of aggregates and possibly other factors.

2 Some modified bitumen binders may undergo phase separate or form skins during RTFO conditioning or PAV ageing and the results from subsequent testing of this residue may not be representative of modified bitumen short term aged under field conditions.

2. References

The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication the edition indicated was valid. All standards are subject to revision,and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below:

IS No. Title

334 : 2002 Glossary of terms relating to bitumen and tar (third revision)