Aging properties of HMB15 with varying binder film thicknesses

Jiantao Wu, Nur Izzi Md Yusoff, Chen Jun, Liu Yun, Mohd Rosli Hainin, Gordon D. Airey

Research output: Contribution to journalArticle

Abstract

In order to cope with the ever-increasing traffic loading and to minimise the cost of road construction and maintenance, several road trials of high modulus base (HMB) materials containing a 15 penetration grade bitumen (known as HMB15) have been carried out in the UK since 1990s. It has been showed that, although HMB 15 behaved in a similar way to conventional dense bitumen Macadam with a cost saving of approximately 25%, its long-term durability (aging and moisture damage) is still a major concern of researchers as considerable deteriorations have been commonly observed during the ongoing investigations on cored samples from the sites (either with or without traffic loading). The aim of this paper was to quantitatively show the relationship between aging properties of HMBl5 and its binder film thickness (binder content), so that an optimum binder content could be determined. In order to achieve this, 5 groups of cylindrical HMB 15 specimens with different binder contents (3.5%, 4%, 4.5%, 5% and 5.5%) were fabricated and subjected to SHRP long-term oven aging test (at 85°C for 5 days), their mechanical properties both before and after aging simulation were tested using indirect tensile stiffness modulus (ITSM) tests. In addition, binders were recovered at different aging stages and their rheological characteristics were investigated with dynamic shear rheometer (DSR) tests. Based on these, aging indices of different groups were calculated and their mathematical relationship with binder film thicknesses was regressed. The results showed that the aging properties of HMB 15 mixtures were significantly affected by their binder film thicknesses. However, regression analysis between aging indices and binder film thicknesses indicated that, as the binder film becomes thicker than 9.5 μm, the change of aging indices with film thicknesses becomes minor and therefore, a film thickness of approximately 9.5 μm was recommended for HMB15 mixtures.

Original languageEnglish
Pages (from-to)1595-1603
Number of pages9
JournalSains Malaysiana
Volume41
Issue number12
Publication statusPublished - Dec 2012

Fingerprint

Binders
Film thickness
Aging of materials
Road construction
Rheometers
Ovens
Thick films
Regression analysis
Deterioration
Costs
Durability
Moisture
Stiffness
Mechanical properties

Keywords

  • Aging
  • DSR
  • Film thickness
  • HMB15
  • ITSM

ASJC Scopus subject areas

  • General

Cite this

Wu, J., Md Yusoff, N. I., Jun, C., Yun, L., Hainin, M. R., & Airey, G. D. (2012). Aging properties of HMB15 with varying binder film thicknesses. Sains Malaysiana, 41(12), 1595-1603.

Aging properties of HMB15 with varying binder film thicknesses. / Wu, Jiantao; Md Yusoff, Nur Izzi; Jun, Chen; Yun, Liu; Hainin, Mohd Rosli; Airey, Gordon D.

In: Sains Malaysiana, Vol. 41, No. 12, 12.2012, p. 1595-1603.

Research output: Contribution to journalArticle

Wu, J, Md Yusoff, NI, Jun, C, Yun, L, Hainin, MR & Airey, GD 2012, 'Aging properties of HMB15 with varying binder film thicknesses', Sains Malaysiana, vol. 41, no. 12, pp. 1595-1603.
Wu J, Md Yusoff NI, Jun C, Yun L, Hainin MR, Airey GD. Aging properties of HMB15 with varying binder film thicknesses. Sains Malaysiana. 2012 Dec;41(12):1595-1603.
Wu, Jiantao ; Md Yusoff, Nur Izzi ; Jun, Chen ; Yun, Liu ; Hainin, Mohd Rosli ; Airey, Gordon D. / Aging properties of HMB15 with varying binder film thicknesses. In: Sains Malaysiana. 2012 ; Vol. 41, No. 12. pp. 1595-1603.
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