ORCID Profile
0000-0003-1130-5400
Current Organisations
University of New South Wales
,
Indian Institute of Science
,
Biochar Innovations Pte. Ltd
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Civil Engineering | Environmental Technologies | Construction Materials |
Cement and Concrete Materials | Environmentally Sustainable Construction not elsewhere classified
Publisher: Springer Science and Business Media LLC
Date: 05-01-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 04-2019
DOI: 10.1016/J.SCITOTENV.2019.01.269
Abstract: This study explores influence of biochar particle size and surface morphology on rheology, strength development and permeability of cement mortar, under moist and dry curing condition. Experimental results show that the flowability and viscosity of cement paste is more affected by macro-porous coarser (or 'normal') biochar particles of size 2-100 μm (NBC) compared to fine (or 'ground' biochar), which is in the size range of 0.10-2 μm (GBC). Addition of both GBC and NBC accelerated hydration kinetics and improved early (1-day) and 28-day strength by 20-25% compared to the control. Water permeability, measured by capillary absorption was reduced by about 50% compared to control mortar, due to the addition of 0.50-1% NBC and GBC respectively. GBC is found to be more effective in minimizing loss in strength and water tightness under dry curing condition compared to the control and mortar with NBC and quartz filler respectively. In summary, findings from the study show that finer biochar particles offer superior performance in improving early strength and water tightness compared to normal biochar (with macro-pores), while 28-day properties are similar for mortar with both GBC and NBC respectively.
Publisher: Elsevier BV
Date: 11-2020
Publisher: Thomas Telford Ltd.
Date: 05-2018
Abstract: Curing of cementitious composites is critical to development of strength and impermeability. However, sufficient and complete curing cannot be achieved in many practical construction cases due to the complexity of construction and limited accessibility. Supplying moisture internally through presoaked superabsorbent polymer (SAP) is a viable option to minimise manual curing. This study investigates the effect of internal curing by presoaked SAP on the strength and permeability of cement mortar, subject to wet curing and air curing over 7 d, 28 d and 56 d respectively. Experimental results show that presoaked SAP with up to 30 g of contained water per gram of dry SAP (g/g) is effective as an internal curing agent in mortar under wet curing and dry air curing conditions. Deployment of presoaked SAP in mortar results in a significantly lower reduction in compressive strength compared to plain mortar, when no external water is available. Presoaked SAP has been found to minimise evaporative moisture loss from mortar while maintaining compressive strength and sorptivity at the desired level under both air curing and wet curing conditions. The findings from this study suggest that the use of SAP with pre-absorbed water has the potential to reduce the manual curing process, which also implies significant reduction in water consumption by the construction sector.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 12-2019
Publisher: Wiley
Date: 19-07-2012
DOI: 10.1111/J.1365-2222.2011.03823.X
Abstract: Food allergy is a growing clinical and public health problem world-wide. The rising incidence is occurring more rapidly than changes to the genome sequence would allow, but it is yet to be determined whether environmental factors might act in interaction with genetic risk. That is to say, are environmental factors more likely to affect those genetically at risk? Family history is a strong risk factor for the development of food allergy as it co-aggregates with other atopic diseases and as such genetic factors do play an important role in food allergy risk. However, significant interest has now turned to the role of epigenetic modifications of the genome as the major mediator of gene-environment interaction. The consideration of the role of epigenetics in food allergy is likely to provide an insight into aetiological and biological disease mechanisms. This paper discusses the current state of knowledge regarding genetic and environmental risk factors for food allergy, and considers the potential for furthering our understanding of food allergy aetiology by examining the role of epigenetic variation.
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.SCITOTENV.2017.11.044
Abstract: Landfilling of food waste due to its low recycling rate is raising serious concerns because of associated soil and water contamination, and emission of methane and other greenhouse gases during the degradation process. This paper explores feasibility of using biochar derived from mixed food waste (FWBC), rice waste (RWBC) and wood waste (mixed wood saw dust, MWBC) as carbon sequestering additive in mortar. RWBC is prepared from boiled plain rice, while FWBC is prepared from combination of rice, meat, and vegetables in fixed proportion. Carbon content in FWBC, RWBC and MWBC were found to be 71%, 66% and 87% by weight respectively. Results show that addition of 1-2wt% of FWBC and RWBC in mortar results in similar mechanical strength as control mix (without biochar). 1wt% of FWBC led to 40% and 35% reduction in water penetration and sorptivity respectively, indicating higher impermeability of mortar. Biochar from mixed wood saw dust performed better in terms of mechanical and permeability properties. Increase in compressive strength and tensile strength by up to 20% was recorded, while depth of water penetration and sorptivity was reduced by about 60% and 38% respectively compared to control. Both FWBC and MWBC were found to act as reinforcement to mortar paste, which resulted in higher ductility than control at failure under flexure. This study suggests that biochar from food waste and mixed wood saw dust has the potential to be successfully deployed as additive in cement mortar, which would also promote waste recycling, and sequester high volume carbon in civil infrastructure.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 03-2018
Publisher: Springer International Publishing
Date: 08-11-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2016
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Thomas Telford Ltd.
Date: 04-2018
Abstract: Polypropylene (PP) fibres are commonly used to restrict early shrinkage and control micro-crack propagation in mortars. However, increased porosity along with reduction in mechanical properties due to PP fibre addition is a concern. The study explores application of superabsorbent polymers (SAPs) to improve mechanical properties and permeability of PP fibre-reinforced mortar. The effect of SAP addition on fresh and hardened properties of fibre-reinforced mortar including flow, mechanical strength, elastic modulus and permeability are investigated. Experimental results show that a combination of SAP and PP fibre offers about 20% improvement in compressive strength. SAP addition increases the resistance of mortar to water penetration by up to 60%, whereas water absorption and coefficient of sorptivity is reduced by up to 46% and 66%, respectively, compared to the control. Improvement in permeability is linked to increased hydration due to SAP addition and blocking of voids by swelled SAP particles upon contact with incoming moisture. In a nutshell, a combination of SAP and PP fibre offers improvement in mechanical properties and permeability of cementitous composite, which is crucial to the serviceability and longer service life of civil infrastructure.
Publisher: Elsevier BV
Date: 11-2019
Start Date: 2021
End Date: 2023
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2021
End Date: 12-2021
Amount: $450,000.00
Funder: Australian Research Council
View Funded Activity