Effect of Aggregate Gradation on Rutting Performance of Asphalt- Rubber Gap Graded (AR-GAP) Mixtures

Author(s): Veena Venudharan and Krishna Prapoorna Biligiri
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 454-463
Total Pages: 10
Language : English

Abstract: The objective of this study was to investigate the effect of aggregate gradation on rutting
performance of AR-Gap mixtures. The scope included: laboratory evaluation of rutting with
the aid of wheel tracking test at high pavement temperatures on AR-Gap mixtures accounting
for six gap-gradations specified by agencies across different countries. Further, two
representative gap-gradations were chosen to evaluate the effect of binder content on rutting
characteristics of AR-Gap mixtures. It was found that the rutting performance of asphalt
mixtures was significantly influenced by the aggregate proportions in the aggregate skeletal
structure. Increased rutting resistance was found in the gradations with higher percentage of
6.4 to 12.5 mm sized aggregates. Further, higher binder content resulted in an increased rut
depth indicative of the tender mixes’ decreased rutting resistance. However, variation in the
binder content produced limited or no impact on the rutting trends of AR-Gap mixtures. It is
envisioned that the study would provide important understanding pertaining to the selection
of the aggregate gradation to improve the rutting performance of AR-Gap mixtures in the
field.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00