The microstructural and mechanical properties of geopolymer composites containing glass microfibres |
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| Affiliation: | 1. Laboratoire de Physico chimie des Matériaux Minéraux, Université de Yaoundé 1, Faculté des sciences, B.P. 812 Yaoundé, Cameroon;2. Laboratoire de Chimie Analytique, Université de Douala, Faculté des Sciences, B.P. 24157 Douala, Cameroon;1. VNR Vignana Jyothi Institute of Engineering & Tahnology, Bachupally, Hyderabad-500090, India;2. GITAM University, Rushikonda, Vishakapatnam-530045, India;1. Department of Imaging & Applied Physics, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. Department of Physics, Umm Al-Qura University, P.O. Box 715, Makkah, Saudi Arabia;3. Department of Civil Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;1. Sir Lawrence Wackett Aerospace Research Centre, School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Melbourne, Australia;2. Polymer Joining Technology Group, Singapore Institute of Manufacturing Technology (SIMTech), 71 Nanyang Drive, Singapore 638075, Singapore;3. Department of Engineering Science and Mechanics, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA;1. Rm. 123 Lowry Hall, Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA;2. Rm. 220 Lowry Hall, Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA |
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| Abstract: | This paper presents the effects of microfibre contents on mechanical properties of fly ash-based geopolymer matrices containing glass microfibres at 0, 1, 2 and 3 mass%. The influence of glass microfibres on the fracture toughness, compressive strength, Young's modulus and hardness of geopolymer composites are reported, as are the microstructural properties investigated using scanning electron microscopy. Results show that the addition of 2 mass% glass microfibres was optimal, exhibiting the highest levels of fracture toughness, compressive strength, Young's modulus and hardness. The results of the microstructural analysis indicate that the glass microfibres act as a filler for voids within the matrix, making a dense geopolymer and improving the microstructure of the binder. This leads to favourable adhesion of the composites, and produces a geopolymer composite with good mechanical properties, comparable to pure geopolymer. The failure mechanisms in glass microfibre-reinforced geopolymer composites are discussed in terms of microstructure. |
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| Keywords: | Composites Fibres Mechanical properties Structural applications |
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