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Full-Text Articles in Engineering
Frontier Technologies In Design And Construction For Sustainable Transport Infrastructure, Buddhima Indraratna, Sanjay Shrawan Nimbalkar, Cholachat Rujikiatkamjorn
Frontier Technologies In Design And Construction For Sustainable Transport Infrastructure, Buddhima Indraratna, Sanjay Shrawan Nimbalkar, Cholachat Rujikiatkamjorn
Faculty of Engineering - Papers (Archive)
Railways are expected to be one of the main modes of future transport in rapidly developing countries with high population densities, including Sri Lanka. In spite of recent advances in rail track geotechnology, ballasted tracks progressively degrade under heavy cyclic and impact loading. Field studies often provide significant knowledge to better understand track performance and to extend the current state-of-the-art in design. Therefore, comprehensive field trials were carried out on two instrumented rail tracks in Bulli and in Singleton, New South Wales, Australia. In these studies, several track sections were reinforced with different types of geosynthetics placed beneath the ballast …
Constriction-Based Retention Criterion For Granular Filter Design, Buddhima Indraratna, A. K. Raut, H. Khabbaz
Constriction-Based Retention Criterion For Granular Filter Design, Buddhima Indraratna, A. K. Raut, H. Khabbaz
Faculty of Engineering - Papers (Archive)
The filter design criteria in practice are currently based on laboratory tests that were carried out on uniform base soil and filter materials. These criteria mostly involve specific particle size ratios, where the system of base soil and filter is represented by some characteristic particle sizes. Consequently, these criteria have limitations when applied to nonuniform materials. In filters, it is the constriction size rather than the particle size that affects filtration. In this paper, a mathematical procedure to determine the controlling constriction size is introduced, and subsequently, a constriction-based retention criterion for granular filters is presented. The model also incorporates …
Highly Processable Method For The Construction Of Miniature Conducting Polymer Moisture Sensors, Scott T. Mcgovern, Geoffrey M. Spinks, G G. Wallace
Highly Processable Method For The Construction Of Miniature Conducting Polymer Moisture Sensors, Scott T. Mcgovern, Geoffrey M. Spinks, G G. Wallace
Faculty of Engineering - Papers (Archive)
A polymer blend incorporating polyaniline (PAn) was used as a sensing medium in the construction of a resistance based humidity sensor. Aniline monomer was polymerised to PAn emeraldine salt (ES) in the presence of poly (butyl acrylate-co-vinyl acetate) and the processable blend was developed by redissolving 1-2 w/w% of the resulting sensing polymer residue in dichloromethane (DCM). Some of this residue was washed in ammonia solution to de-dope the PAn to emeraldine base (EB) to act as a protective layer on the surface of the sensing polymer. This residue was then washed with distilled water until a neutral pH was …