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171 results on '"Navaratnam, Satheeskumar"'

31. Application of Recycled Cardboard to Construction Based on Life Cycle Assessment.

Author

Venkatesan, Srikanth, Zhang, Jingxuan, Law, David, Gravina, Rebecca, and Navaratnam, Satheeskumar

Abstract

Typical household recyclable bin in Australia contains around 60% of waste cardboard. Given the possibilities of developing a construction material, this study conducted a life cycle assessment (LCA) comparing the development of cardboard trusses with © timber trusses, encompassing production to construction. The results show that cardboard trusses offer significant environmental benefits, including a 73% reduction in climate change category, an 83% decrease in ozone-depleting potential, and almost complete avoidance of agricultural land occupation compared to timber trusses, showcasing their sustainability. In both material manufacturing and material transportation, cardboard trusses prioritize climate change mitigation, accounting for over half of the environmental impact. Timber trusses, in contrast, heavily impact land occupation and exhibit climate change dominance. A benefit analysis highlights advantages of cardboard trusses, particularly in reducing land occupation, sustainability, circular economy, and particulate matter formation. The life cycle cost analysis demonstrates an impressive 83% cost reduction for cardboard trusses compared to timber trusses, despite higher labor costs during manufacturing. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Enhancement of impact resistance of alkali‐activated slag concrete through biochar supplementation.

Author

Egodagamage, Harshani, Yapa, Hiran, Buddika, Samith, Loh, Thomas, Navaratnam, Satheeskumar, Patrisia, Yulin, and Nguyen, Kate

Subjects
RICE hulls, IMPACT strength, CRACK propagation, BIOCHAR, COMPRESSIVE strength, MORTAR
Abstract

Biochar is a well‐known sustainable and effective additive used in mortar/concrete to improve its mechanical properties. However, its potential to improve the impact resistance of concrete is still unexplored. This paper investigates biochar's effectiveness in improving the strength and impact performance of alkali‐activated slag concrete (AASC). Five AASC samples with 0%, 2%, 4%, 6%, and 8% rice husk biochar (RB) were employed in an experimental program. The strength and the impact resistance were tested, and the latter was assessed over a drop‐weight test conforming to the ACI Committee 544 guidelines. The crack propagation of the impact‐tested samples was examined using micro‐CT images. The results showed that adding RB up to 6% improved, notably the 28‐day compressive strength of AASC. At 6% RB, the strength enhancement was 44.6%, whereas no additional gain was observed at the 8% RB blend. More importantly, except for the 8% RB sample, the impact resistance was considerably augmented with the RB level increment. The increment in the impact number at the first crack and the failure in the 6% RB sample were as high as 185% and 180%, respectively. The reduction in the solution/binder ratio of the mix with the addition of biochar and the internal curing effect of biochar were deemed to be responsible for these improvements. However, possibly due to biochar's brittle characteristics, the increase in RB dosage from 6% to 8% reduced the impact resistance drastically. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Load-Carrying Capacity of Laminated Veneer Lumber Joists with Notches and Holes.

Author

Navaratnam, Satheeskumar and Rajeev, Pathmanathan

Subjects
*SHEARING force, *NOTCH effect, *LUMBER
Abstract

This study aims to assess the effect of notches and holes on the structural performance of laminated veneer lumber (LVL) joists using experimental and numerical methods. A total of 40 samples were manufactured with three different notch depths and without notch and tested under a three-point bending load. Subsequently, detailed numerical models were developed and validated with experimental results. The effect of a notch, hole, and location on the load-carrying capacity, shear and flexural stress, and flexural stiffness of the LVL joist were evaluated through the validated numerical model. Results showed that the hole and notch significantly affect the structural performance of the LVL joist. Further, the notch or hole in the middle of the bending span induces a higher load-carrying capacity reduction (i.e., more than 50%) than that of from shear span. Further, the larger hole (i.e., size beyond 33% of the joist' depth) located in the shear and bending span reduced the load-carrying capacity by more than 15% and 50%, respectively. A similar reduction was also observed in the flexural and shear stress of the LVL joist. Moreover, this study proposed a response surface-based model to predict the failure load and flexural stiffness of LVL joists with and without holes and notches. [ABSTRACT FROM AUTHOR]

Published
2023
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