ORCID Profile
0000-0002-2346-8250
Current Organisation
University of Leeds
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Civil Engineering | Civil Geotechnical Engineering |
Road Infrastructure and Networks | Construction Design not elsewhere classified | Rail Infrastructure and Networks | Environmentally Sustainable Construction not elsewhere classified | Civil Construction Design
Publisher: Thomas Telford Ltd.
Date: 10-2019
Abstract: This study involved the laboratory evaluation of the effectiveness of lignosulfonate (LS) admixture in improving engineering properties (i.e. swell potential, unconfined compressive strength, durability, compaction characteristics, permeability, consolidation characteristics and shrinkage behaviour) of a remoulded expansive soil. Standard geotechnical laboratory tests performed on untreated and LS-treated soil specimens compacted at optimum moisture content and maximum dry unit weight showed significant and consistent improvements in the engineering properties of the soil. The swell potential of the soil decreased by 23% while maintaining its ductility and pH value. The improved soil resistance to repeated freeze–thaw/wet–dry cycles was also observed in the LS-treated specimens. Likewise, the compressive strength, consolidation characteristics and shrinkage limit improved appreciably. However, the compaction characteristics and permeability of the treated soil remained relatively unchanged. With over 50 Mt of global annual production of LS, the successful use of LS as an alternative admixture for expansive soil stabilisation provides viable solutions to the sustainable use of the lignin by-products from paper manufacturing industry.
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2016
Publisher: Thomas Telford Ltd.
Date: 10-2022
Abstract: Generation of acidic groundwater attributed to pyrite oxidation in low-lying acid sulfate soil has caused substantial damage to the soil-water environment and civil infrastructure in coastal Australia. The installation of permeable reactive barriers (PRBs) is a frontier technology in the field of acid neutralisation and removal of toxic heavy metal cations – for ex le, soluble iron (Fe) and aluminium (Al). This study aims to assess the potential of limestone (calcite) aggregates as the PRB’s main reactive material in low-lying pyritic land. During long-term laboratory column experiments, a significant capacity of limestone for removing contaminant chemical species was observed. Nevertheless, the formation of secondary mineral precipitates upon geochemical reactivity within the granular media in the PRB caused armouring and chemical clogging, which diminished the rate of reactivity – that is, the treatment capacity of calcite aggregates – mainly at the entrance zone of the porous media. Flow properties were altered due to blockage of pores for instance, hydraulic conductivity was reduced by 25% at the inlet zone. Non-homogeneous clogging towards the outlet was analysed, and the time-dependent effect on the longevity of a limestone column was studied and quantified.
Publisher: Elsevier BV
Date: 03-2019
Publisher: Thomas Telford Ltd.
Date: 02-2022
Abstract: Recycling waste materials for transport infrastructure such as coal wash (CW), steel furnace slag (SFS), fly ash (FA) and recycled tyre products is an efficient way of minimising the stockpiles of waste materials while offering significant economic and environmental benefits, as well as improving the stability and longevity of infrastructure foundations. This paper presents some of the most recent state-of-the-art studies undertaken at the University of Wollongong, Australia on the use of waste materials such as (a) CW-based granular mixtures (i.e. SFS + CW, CW + FA) for port reclamation and road base/subbase and (b) using recycled tyre products (i.e. rubber crumbs, tyre cell, under-sleeper pads and under-ballast mats) to increase track stability and reduce ballast degradation. Typical methods of applying these waste materials for different infrastructure conditions are described and the results of comprehensive laboratory and field tests are presented and discussed.
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2018
Publisher: American Society of Civil Engineers
Date: 17-03-2015
Publisher: Springer Singapore
Date: 2019
Publisher: CRC Press
Date: 20-07-2017
Publisher: Springer Singapore
Date: 2019
Publisher: Elsevier
Date: 2015
Publisher: Thomas Telford Ltd.
Date: 09-2019
Abstract: Strengthening soft and weak soil by way of root reinforcement is a well-known strategy that is adopted worldwide. In Australia, native gum trees remain evergreen throughout the year and have been utilised to stabilise transportation corridors by way of reinforcement provided by the roots and the suction generated within the root domain as a function of evapotranspiration through the canopy. A mature gum tree can induce a missive total suction pressure exceeding 30 MPa through its root water and solute uptake in terms of matric plus osmotic suction. This cumulative effect of matric and osmotic suctions contributes to the overall shear strength of the soil, but the significant osmotic suction is often ignored in classical geotechnical engineering that does not consider the presence of trees. This study is an attempt to demonstrate the important role of osmotic suction, because it is directly proportional to the solute concentration in the soil and the solute uptake mechanisms of the surrounding vegetated ground.
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2020
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: EDP Sciences
Date: 2019
DOI: 10.1051/E3SCONF/20199206004
Abstract: The practical application of waste materials such as steel furnace slag (SFS) and coal wash (CW) is becoming more prevalent in many geotechnical projects. It was found that the inclusion of rubber crumbs (RCs) from recycled tyres into mixtures of SFS and CW not only solves the problem of large stockpiles of waste tyres, it also can provide an energy-absorbing medium that will reduce track degradation. In order to investigate the influence of RC on the geotechnical properties of the granular waste matrix (SFS+CW+RC), a series of monotonic consolidated drained triaxial tests were conducted on waste mixtures. The test results reveal that the inclusion of RC significantly affects the geotechnical properties of the waste mixtures, especially their critical state behaviour. Specifically, the waste matrix can achieve a critical state with a low RC content ( %), whereas those mixtures with higher RC contents (20-40%) cannot attain a critical state within the ultimate strain capacity that can be applied to specimens using the traditional triaxial equipment. Therefore, for the waste matrix with higher RC contents extrapolation of the measured volumetric strains had to be adopted to obtain the appropriate critical state parameters. Moreover, the influence of energy absorbing property by adding RC on the critical state behaviour has also been captured through an empirical equation.
Publisher: Thomas Telford Ltd.
Date: 03-2023
Abstract: Vegetated ground is strengthened by the suction generated during evapotranspiration as well as physically and mechanically by the reinforcement effect induced by tree roots. When suction suddenly decreases during flooding or intense rainfall, the shear strength of the soil–plant system relies mainly on the physical root reinforcement. In this paper, the pull-out behaviour of simulated roots embedded in a compacted soil is investigated to assess how the soil–plant system is mechanically strengthened. An analytical framework is developed to estimate the pull-out force and it is validated using a series of pull-out tests. The tests are carried out on simulated roots embedded in a box of compacted soil having different water contents and equivalent dry unit weights. The results show that the pull-out capacity of this root system is mainly influenced by the initial (as-compacted) suction, and the length and diameter of the roots. The model predictions agree reasonably well with the experimental observations.
Publisher: Elsevier BV
Date: 09-2014
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2018
Publisher: Springer Singapore
Date: 2019
Publisher: American Society of Civil Engineers
Date: 24-02-2014
Publisher: Thomas Telford Ltd.
Date: 08-2019
Abstract: In this paper, a sustainable approach for reducing lateral displacement in a track by increasing the confining pressure in the track substructure is demonstrated by placing a cellular rubber (tyre) membrane infilled with crushed ballast, as an alternative to a traditional capping layer of compacted granulates. Plate-load tests on a single tyre filled with gravel and subjected to a vertical load were carried out to investigate the interaction between tyre and gravel. A track model with tyre reinforcement was created to evaluate the performance of a tyre-reinforced capping layer under cyclic loading, and a numerical model was developed to determine the benefit that tyres would provide to railway substructure, especially when spent ballast is recycled as capping layer materials.
Publisher: ASTM International
Date: 02-07-2018
DOI: 10.1520/GTJ20160234
Publisher: Springer Singapore
Date: 2019
Publisher: American Society of Civil Engineers
Date: 30-03-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2020
Publisher: ASTM International
Date: 14-05-2015
DOI: 10.1520/GTJ20140047
Publisher: Canadian Science Publishing
Date: 02-2013
Abstract: Small-strain behavior is a key indicator for assessing the performance of compacted fills. Compaction conditions, i.e., initial moisture content and applied energy, govern compaction effectiveness and thus, the structure and matric suction of compacted soil. This paper presents an experimental study of the small-strain behavior of compacted silty sand prepared with different compaction conditions. Specimens with varying initial moisture contents and compaction energies were tested with bender elements to determine the small-strain shear modulus (G 0 ), while the post-compaction matric suction was measured using the filter paper method and tensiometer. The experimental data suggest a pronounced relationship between G 0 and the degree of saturation (S r ) of the as-compacted soil specimens. X-ray computed tomography (CT) scans were performed to examine structural changes of selected specimens upon compaction. The laboratory results are also examined in light of common end-product specifications, which show that it is beneficial to compact the soil slightly dry of optimum moisture content from the modulus point of view.
Publisher: Informa UK Limited
Date: 31-10-2021
Publisher: Thomas Telford Ltd.
Date: 11-2019
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2021
End Date: 03-2024
Amount: $570,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2017
End Date: 03-2020
Amount: $590,000.00
Funder: Australian Research Council
View Funded Activity