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Subject: search.filters.subject.corrosion

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Now showing 1 - 3 of 3
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    PublicationOpen Access
    Development of Coir Fiber Reinforced Polymer Reinforcing Bars for Concrete Structures
    (Sri Lanka Institute of Information Technology, 2023-03-25) Tharmarajah, G; Wimalasuriya, W.B.U
    At present, global warming increment and petroleum reserve depletion have been a major threat to the environment. These occur due to various human activities. Construction industry contributes 40 % for the global carbon emission. From that 10% is contributed from the manufacture of cement and the rest is contributed by the other requirements in the construction industry. Therefore, scientists are now more focused to involve bio-based products to minimize the emission of carbon. This resulted in, paying more attention towards the natural composite materials that can be used instead of artificial materials. Scientists are eager to find natural materials which are locally available. The structures built today, does not survive the entire service life of the structure. This is due to corrosion of steel, especially in coastal areas. So, in order to overcome this, use of a natural material which can provide the same tensile strength can be used. Over the past few decades engineering materials like composites, plastics, ceramics has dominated the engineering industry. There are new polymer materials introduced such as glass fiber, carbon fiber and aramid but they are not eco-friendly. The main problem associated with these is the high production cost. Therefore, new composites which are environmentally friendly should be found in order to replace other materials. Even though there has been much research published on different natural fiber composite materials, here an attempt has been made to use coir to produce reinforcement bars in order to combat corrosion
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    PublicationOpen Access
    Durability of Cold Formed Steel Structures used in residential and industrial construction
    (Sri Lanka Institute of Information Technology, 2023-03-25) Cooray, K.P.; Tharmarajah, G
    Cold formed steel is an attractive alternative to traditional construction materials such as masonry and concrete owing to the advantages such as easy fabrication, light weight, reusability of the material and higher level of recyclability. Cold formed steel buildings are also appreciated for better insulation and lower energy consumption during operation. However, durability of the steel was the main concern for stakeholders as corrosive conditions can damage the material and deteriorate the condition of the building. Therefore, it is important to understand the durability of cold formed steel coated with zinc and zinc alloys. In this study, experimental data related to durability studies available in literature was collected and presented through an analysis. The data obtained from literature indicate that if the building envelop was designed appropriately to protect the steel from exposure conditions, the steel can fulfil the expected service life of residential buildings independent of environmental and climatic conditions. Therefore, this study helps to alleviate concerns regarding durability of cold formed steel in residential construction.
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    PublicationOpen Access
    Experimental and Numerical Investigation of Compressive Membrane Action in GFRP-Reinforced Concrete Slabs
    (MDPI, 2023-02-28) Tharmarajah, G; Taylor, S; Robinson, D
    Experimental and numerical analyses of eight in-plane restrained slabs (1425 mm (length) × 475 mm (width) × 150 mm (thickness)) reinforced with glass fiber-reinforced polymer (GFRP) bars are reported in this paper. The test slabs were installed into a rig, that provided 855 kN/mm in-plane stiffness and rotational stiffness. The effective depths of the reinforcement in the slabs varied from 75 mm to 150 mm, and the amount of reinforcement changed from 0 to 1.2% with 8, 12, and 16 mm bar diameters. A comparison of the service and ultimate limit state behavior of the tested one-way spanning slabs shows that a different design approach is necessary for GFRP-reinforced in-plane restrained slabs that demonstrate compressive membrane action behavior. Design codes based on yield line theory, which considers simply supported and rotationally restrained slabs, are not sufficient to predict the ultimate limit state behavior of restrained GFRP-reinforced slabs. Tests reported a higher failure load for GFRP-reinforced slabs by a factor of 2, which was further validated by numerical models. The experimental investigation was validated by a numerical analysis, and the acceptability of the model was further confirmed by consistent results obtained by analyzing in-plane restrained slab data from the literature.