Effect of Aggregate Gradation on Moisture Susceptibility and Creep in HMA

Authors: Haider H. Aodah, Yassir Nashaat A. Kareem, Satish Chandra

Abstract:

The present study explains the effect of aggregate gradation on moisture damage in bituminous mixes. Three types of aggregate gradation and two types of binder; VG-30 and Polymer modified bitumen (PMB-40) are used. Moisture susceptibility tests like retained stability and tensile strength ratio (TSR) and static creep test are conducted on Marshall specimens. The creep test was also conducted for conditioned and unconditioned specimens to observe the effect of moisture on creep behaviour. The results indicate that Marshall stability value is higher in PMB-40 mix than VG-30 mixes. Moisture susceptibility of PMB-40 mixes is low when compared with mix using VG-30. The reduction in retained stability, and indirect tensile strength and increase in creep are evaluated for finer, coarser and normal gradation of aggregate to observe the effect of gradation on moisture susceptibility of mixes. The retained stability is least affected when compared with other moisture susceptibility parameters

Keywords: Aggregate gradation, Creep ratio, Retained stability, Stripping, Tensile strength ratio.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1057883

References:

[1] Abo-Qudais, S. A, (2007) "The effects of environmental damage evaluation techniques on the prediction of environmental damage in asphalt mixtures". Science Direct, building and environmental journal U.K, volume 42, pp 288 - 296.
[2] Abo-Qudais, S. A and Haider Al-Shweily (2007) "Effect of Antistripping Additives on Environmental Damage of Bituminous Mixtures". Science Direct, building and environmental journal U.K, volume 42, pp 2929 - 2938.
[3] Brown, E.R. and Bassett, C.E., (1989) "The Effects of Maximum Aggregate Size on Properties of Asphalt Aggregate Mixes", Report submitted to Highway Research Center, Harbert Engineering, Auburn University, Alabama.
[4] Cominsky, R., Leahy, R. B. and Harrigan, E. T., (1994), "Level One Mix Design: Material Selection, Compaction, and Conditioning". Report SHRP-A-408. Strategic Highway Research Program, National Research Council. USA.
[5] Eliana, P. and John E.P. (2006)," HMA Pavement Performance and Durability" Joint Transportation Research Program, School of Civil Engineering, Purdue University, USA. Pp.7.
[6] IS 73 (2006), "Paving Bitumen Specifications", Indian Standards Institution, New Delhi, India.
[7] Kandhal, P., (1992), "Moisture Susceptibility of HMA Mixes: Identification of Problem and Recommended solutions", NCAT Report No. 92-1. National Center for Asphalt Technology, pp.11.
[8] Kanitpong, K. and Bahia, H.U. (2003)," Evaluation of the Extent of HMA Moisture Damage on Wisconsin as it Relates to Pavement Performance", Final Report No. WHRP 03-07, University of Wisconsin- Madison.
[9] Kumar, P., Chandra, S. and Bose, S., (2006)," Strength Characteristics of Polymer Modified Mixes". International Journal of Pavement Engineering (IJPE), Vol. 7, No. 1, pp. 63-71.
[10] Mc Gennis, R. B., Anderson, R. M., Kennedy, T. W. and Solaimanian, M. (1994), "Background of Superpave Asphalt Mixture Design and Analysis". Report SA-95-003. Federal Highway Administration, U.S. Department of Transportation
[11] Pan, C., L., and White, T. (1999), "Conditions for Stripping Using Accelerated Testing". FHWA/IN/JTRP-97/13 HPR-2068. Indiana Department of Transportation.
[12] Roberts, F. L., Kandhal, P. S., Brown, E. R., Lee, D., and Kennedy, T., (1996), "Hot Mix Asphalt Materials, Mixtures, Design, and Construction" NAPA Education Foundation, Lanham, Maryland. Second Edition, pp. 241-250.