Aging properties of HMB15 with varying binder film thicknesses

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...

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Main Authors:	Wu, Jiantao, Nur Izzi Md. Yusoff, Chen, Jun, Liu, Yun, Gordon D. Airey
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2012
Online Access:	http://journalarticle.ukm.my/5678/ http://journalarticle.ukm.my/5678/ http://journalarticle.ukm.my/5678/1/14%2520Wu%2520Jiantao.pdf

id	ukm-5678
recordtype	eprints
spelling	ukm-56782016-12-14T06:39:10Z http://journalarticle.ukm.my/5678/ Aging properties of HMB15 with varying binder film thicknesses Wu, Jiantao Nur Izzi Md. Yusoff, Chen, Jun Liu, Yun Gordon D. Airey, 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 HMB15 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 HMB15 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 HMB15 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 85oC 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 HMB15 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. Universiti Kebangsaan Malaysia 2012-12 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/5678/1/14%2520Wu%2520Jiantao.pdf Wu, Jiantao and Nur Izzi Md. Yusoff, and Chen, Jun and Liu, Yun and Gordon D. Airey, (2012) Aging properties of HMB15 with varying binder film thicknesses. Sains Malaysiana, 41 (12). pp. 1595-1603. ISSN 0126-6039 http://www.ukm.my/jsm/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	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 HMB15 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 HMB15 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 HMB15 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 85oC 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 HMB15 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.
format	Article
author	Wu, Jiantao Nur Izzi Md. Yusoff, Chen, Jun Liu, Yun Gordon D. Airey,
spellingShingle	Wu, Jiantao Nur Izzi Md. Yusoff, Chen, Jun Liu, Yun Gordon D. Airey, Aging properties of HMB15 with varying binder film thicknesses
author_facet	Wu, Jiantao Nur Izzi Md. Yusoff, Chen, Jun Liu, Yun Gordon D. Airey,
author_sort	Wu, Jiantao
title	Aging properties of HMB15 with varying binder film thicknesses
title_short	Aging properties of HMB15 with varying binder film thicknesses
title_full	Aging properties of HMB15 with varying binder film thicknesses
title_fullStr	Aging properties of HMB15 with varying binder film thicknesses
title_full_unstemmed	Aging properties of HMB15 with varying binder film thicknesses
title_sort	aging properties of hmb15 with varying binder film thicknesses
publisher	Universiti Kebangsaan Malaysia
publishDate	2012
url	http://journalarticle.ukm.my/5678/ http://journalarticle.ukm.my/5678/ http://journalarticle.ukm.my/5678/1/14%2520Wu%2520Jiantao.pdf
first_indexed	2023-09-18T19:44:49Z
last_indexed	2023-09-18T19:44:49Z
_version_	1777405829963579392

Aging properties of HMB15 with varying binder film thicknesses

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