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The use of gypsum and waste gypsum for electrical grounding backfill

Amizatulhani, Abdullah and Nurmazuria, Mazelan and Mohd Yuhyi, Mohd Tadza and Rahisham, Abd Rahman (2021) The use of gypsum and waste gypsum for electrical grounding backfill. In: Proceedings of the 11th National Technical Seminar on Unmanned System Technology 2019 (NUSYS’19), 2-3 December 2019 , Universiti Malaysia Pahang, Gambang Campus, Kuantan, Pahang, Malaysia. pp. 1213-1226., 666. ISBN 978-981-15-5280-9

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Large quantities of gypsum arise from the production of titanium dioxide and from construction waste plasterboard. Due to strict legislation, alternative applications for both gypsum are desperately required. Gypsum-based compounds have been shown to improve the electrical conductivity of materials. In this study, both red gypsum and plasterboard gypsum were investigated for the use as grounding enhancement backfill material. The current investigation undertaken aimed to develop gypsum-based grounding enhancement material that has low resistivity. Tests included determination of geotechnical properties, plasticity characteristics and the electrical resistivity corresponding to different state and water content. Test results showed that, the geotechnical properties of RG vary to that of white gypsum. RG is classified as extremely high plastic whereas gypsum is classified as high plastic. The plasticity index (PI) of RG was found to be 240% greater due to surplus Fe ions. When mixed with water, both material can exist in four different state, ranging from solid, semi-solid, plastic and liquid. Surprisingly, the electrical resistivity of gypsum is lower under wet conditions irrespective of the state. However for long-term and from practical perspective, RG is a better material for grounding purposes as the plasticity of gypsum was found to be short lived and hardened instantaneously due to exothermic reaction. Once hardened, the gypsum resistivity behaviour behave similar to its dry state.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Lecture Notes in Electrical Engineering
Uncontrolled Keywords: Gypsum; Titanium Dioxide; Red Gypsum; Plasticity; Grounding; Electrical Resistivity
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty/Division: Faculty of Civil Engineering & Earth Resources
Institute of Postgraduate Studies
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 21 Jul 2020 03:12
Last Modified: 21 Jul 2020 03:12
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