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Tensile strength of gabion wires against simulated weathering and field conditions

Tan, Kok Keong and Chan, Chee Ming and Liew, Allan (2018) Tensile strength of gabion wires against simulated weathering and field conditions. In: Sustainable Environmental Technology. Penerbit UTHM, pp. 101-114. ISBN 978-967-2216-44-5

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Abstract

Gabions can be applied in both civil and hydraulic engineering, it implies that gabions will be found in or on soil as retaining structures, along the streams and sea coast as erosion control structures. With such wide applications, the gabions must be built durable enough to withstand all possible site conditions that might weaken and damage the structure. However, the durability of the gabions relies greatly on the durability of the wire mesh as limited life of the wire basket is the major drawback of gabions [1]. To overcome, present coating technology which applies a polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE) guaranteed the durability of gabions [2]. Gabions can be formed by hexagonal woven wire mesh or welded wire mesh. For wire mesh, the materials must satisfy high mechanical properties and corrosive resistance. Galvanized wires are normally used to reduce corrosion. The wires may be also coated with PVC or other materials to prevent corrosion which can damage the wire mesh [3]. When individual units are stacked, it forms a reinforced cellular structure, known as gabions wall. Coatings play a significant role in corrosion control which are later applied in major corrosion-control methods include sacrificial protection and barrier protection, but very often they are used in conjunction [4]. Sacrificial protection, cathodic protection or zinc-rich coating is a method to prevent corrosion galvanically. In contrast, barrier protection is usually applied in the form of impermeable coatings to suppress the transmission of oxygen and water from contacting the metal surface, to a sufficient extend that corrosion may be prevented [5]. Weathering is a universal phenomenon that occurred in plastic materials when they are subjected to external environments and exposed to the outdoor thermal, radiation moisture and chemical conditions [6]. The effects of weathering can be shown in various forms including change in colour, texture and dimensions, weakening of molecular chains, altering the mechanical, electrical and physical properties. Worse, weathering may cause materials to completely deteriorate. Weathering factors include heat, light, oxygen, water/humidity and pollutants [7]. Weathering test is a scientific process of exposing polymeric materials to a natural environment or accelerated in a weathering chamber. Weathering techniques generally involve comparative technique which expose materials together with a benchmark material of known performance or measure the change in properties of an exposed material [6]. Weathering test is a variable science as the weather is variable, hence the exposed materials are facing constant change of environment [6]. The objectives of this study are to determine the anti-corrosion characteristics of a proprietary plastic-based coating material for gabion steel wire and to identify the rate of corrosion under various weathering conditions in dry and soaked conditions. Study was conducted to examine the effectiveness of a proprietary plastic-based protective coating for gabion wires against corrosion in exposure to weathering elements. Material is based on the Industrial Collaborator, i.e. United Glory Industry Sdn. Bhd, Batu Pahat recommendation and supply. Weathering elements examined include UV exposure and heat in both dry and soaked conditions. The effectiveness of the protecting coating would be determined by tensile properties tests. Material samples are subjected to natural weathering for 750 hours. is a

Item Type: Book Section
Subjects: T Technology > T Technology (General)
Depositing User: Mr Abdul Rahim Mat Radzuan
Date Deposited: 31 Oct 2019 02:44
Last Modified: 31 Oct 2019 02:44
URI: http://eprints.uthm.edu.my/id/eprint/11914
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