Effect of MIST conditioning on the air voids and permeability of hot asphalt mixes containing reclaimed asphalt pavement

Abstract

Traffic traversing on an asphalt pavement leads to the development of hydrodynamic stress. Hence, moisture-induced stress tester (MIST) was developed to simulate the phenomenon. However, MIST has the propensity to affect the air voids (V_a) and permeability (k) characteristics of the conditioned mix. In this study, an attempt has been made to understand the effect of varying stress cycles of MIST on V_a and k. Furthermore, due to the advantages associated with recycled asphalt pavement (RAP) mixes, this study also considers RAP in varying proportions of 10%, 20%, 30% and 40% by weight. The results indicate that MIST conditioning affects both V_a and k of asphalt mixes. RAP mixes were observed to undergo higher changes in V_a and depicted higher k than control mix. It is expected that the results of the current study may prove to be significant in explaining the change in performance parameters due to MIST conditioning.

KEYWORDS:

• MIST
• air voids
• permeability
• bulk specific gravity
• modelling

Acknowledgements

The authors express their gratitude towards TikiTar industries, A. R. Thermosets and Thane Municipal Corporation (TMC) for the supply of materials utilised for the current study.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

Some or all data, models or codes that support the findings of this study are available from the corresponding author upon reasonable request. The available data include the permeability and air void results for control and RAP mixes at different stress cycles adopted in this study.

Additional information

Funding

The authors acknowledge the financial support provided by the Department of Science and Technology (DST), India Government of India, under project no. 17DST006.