Application of surface free energy techniques to evaluate bitumen-aggregate bonding strength and bituminous mixture moisture sensitivity

Author:

Grenfell James R. A.1,Ahmad Naveed2,Liu Yawen3,Apeagyei Alex K.4,Airey Gordon D.5,Large David6

Affiliation:

1. Research Officer, Nottingham Transportation Engineering Centre, Department of Civil Engineering, University of Nottingham, UK

2. Assistant Professor, Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan

3. Graduate Research Assistant, Nottingham Transportation Engineering Centre, Department of Civil Engineering, University of Nottingham, UK

4. Research Fellow, Nottingham Transportation Engineering Centre, Department of Civil Engineering, University of Nottingham, UK

5. Professor of Civil Engineering, Nottingham Transportation Engineering Centre, Department of Civil Engineering, University of Nottingham, UK

6. Head of Department, Department of Chemical and Environmental Engineering, University of Nottingham, University Park, UK

Abstract

This paper presents a combination of surface free energy testing techniques for aggregates and bitumen, with mechanical moisture-sensitivity assessment techniques for identification of compatible bitumen–aggregate combinations. Results from the surface free energy measurements and calculations were compared with data from the rolling bottle test and the saturation ageing tensile stiffness test in order to establish relationships amongst the three techniques. The mineralogical composition and microstructure of the aggregates were characterised using a mineral liberation analyser. For the same bitumen type, moisture sensitivity of mixtures containing limestone aggregates were found to be lower than mixtures containing granite aggregates. The presence of high amounts of quartz and feldspar (up to 50%) in the granite compared with almost none in limestone, and the significant amount of calcite in limestone (96% or more) versus none in granite were cited as possible reasons for the differences in performance of the two aggregate types. The porosity of the worst performing aggregates was higher than the best performing aggregate. The study concludes that moisture damage in the bituminous mixture is a function of the physico-chemical surface free energy properties of bitumen and aggregates as well as the mineralogical composition of aggregates.

Publisher

Thomas Telford Ltd.

Subject

Mechanics of Materials,General Materials Science,Civil and Structural Engineering

Reference32 articles.

1. State of the Art Report on Moisture Sensitivity Test Methods for Bituminous Pavement Materials

2. Development of an accelerated durability assessment procedure for high modulus base (HMB) materials

3. AASHTO (American Association of State Highways and Transportation Officials). Resistance of compacted bituminous mixtures to moisture induced damage.2000, AASHTO, Washington, DC, USA, AASHTO T283-99.

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