Glass Fibre Lab Report

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2.2 Characteristics on Glass Fibre Reinforced Concrete (GFRC) Glass fibre reinforced concrete is defined as a concrete composition that consist material such as cement, sand, water and admixtures with short length discrete glass fibre were dispersed (Amit Rai et al,2014). It had been using in many countries. Part of research study on the effect of stirrup spacing with 50mm,75mm and 100mm by adding various weight percentage of glass fibre that 0.75% and 1.5% respectively. Based on experimental result shown that the shear strength of tested beam increased as well as the weight percentage of glass fibres (Soliman et.al,2012). The main factor that makes glass fibre was used in construction were it possessed high compressive strength on concrete…show more content…
The glass fibre shape exist in round and straight with diameter of 0.005 to 0.015mm. Glass fibre length 35mm are used in spray application and 25mm length in premix application. Meanwhile, glass fibre had high tensile strength (2-4Gpa) and elastic modulus (70-80Gpa) but had brittleness problem on stress-strain characteristic with (2.5-4.5% elongation at breaking) and low creep at room temperature. (Srinivasa et al,2012) The glass fibre had alkalinity problem. Generally, glass fibre reinforced concrete (GFRC) had intermediate characteristics between rigidity and compressive strength of cement and high tensile strength of glass fibre. Besides that, GFRC shown 20 times of its impact of asbestos cement. This fibre gave two to three times of flexural strength of normal reinforced concrete (Neal et al, 1978). Based on theoretical mechanics of cement and concrete stated that tensile failure began with micro crack and microcrospic separation. As a result, cohesive crack existed where it will produce break on concrete. Glass fibre also acted as crack arrester. This can be explained when the first crack occur in the matrix where the strong fibre pick up the load. In other words, it meant the support was stronger than the matrix itself where more load will only produce new crack but glass fibre will immediately arrest the crack in order to avoid first crack from propagating…show more content…
This method need minimum capital outlay. However, the strength level is in modest state as high fibre concentration is difficult and the fibre are oriented in three dimension. The premixed material is usually placed into a mould and vibrated but it can alternatively be applied by using trowel or spray. Thus, the glass fibre added at the end of concrete mix cycle in order to avoid glass fibre strength from decreasing. (Neal et, al, 1978) Figure 2.7: Premixed Method. From GRC & Construction Pte Ltd,n.d,Retrived Jan 29,2015, From http://www.grcconstruct.com/products.html 2. Automatic Spray Suction Automatic spray suction uses spray head mixing process which can be adapted to continuous line factory production. This process contain wet cement slurry that will be sprayed and chop fibre strands that will be put onto perforated pan covered with filter media. The suction help to remove excess water and help to compact the material. Glass fibre product that produced from this method was in two dimension of it orientation. This method also allowed fibre to be used with good distribution and permits use of longer fibre. (Wallace et,

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