Journal of Asian Ceramic Societies
ISSN: (Print) 2187-0764 (Online) Journal homepage: http://www.tandfonline.com/loi/tace20
Effect of glass microfibre addition on the mechanical performances of fly ash-based geopolymer composites Thamer Alomayri To cite this article: Thamer Alomayri (2017) Effect of glass microfibre addition on the mechanical performances of fly ash-based geopolymer composites, Journal of Asian Ceramic Societies, 5:3, 334-340, DOI: 10.1016/j.jascer.2017.06.007 To link to this article: https://doi.org/10.1016/j.jascer.2017.06.007
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Journal of Asian Ceramic Societies 5 (2017) 334–340
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Full Length Article
Effect of glass microfibre addition on the mechanical performances of fly ash-based geopolymer composites Thamer Alomayri Physics Department, Faculty of Applied Science, Umm Al-Qura University, P.O. Box 21955, Makkah, Saudi Arabia
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Article history: Received 13 May 2017 Received in revised form 15 June 2017 Accepted 21 June 2017 Available online 2 July 2017 Keywords: Geopolymers Composites Mechanical properties
a b s t r a c t In the present study, various amounts of glass microfibres were introduced into a geopolymer for reinforcement purposes. The influence of these microfibres on the performance of the geopolymer composites was investigated. Results show that the appropriate addition of glass microfibres can improve the mechanical properties of geopolymer composites. In particular, the flexural strength, flexural modulus and impact strength increase at an optimum fibre content of 2 wt%. Further, adding glass microfibres to a plain geopolymer matrix has a significant effect on the pre-cracking behaviour. It substantially enhances the post-cracking response. © 2017 The Ceramic Society of Japan and the Korean Ceramic Society. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
1. Introduction Ordinary Portland cement (OPC) is a binder used in concrete and cement-based materials. Whilst OPC has served an important role in construction, its production is associated with environmental consequences including significant greenhouse gas emission. The production of one ton of OPC has been found to emit a ton of gaseous CO2 and the cement industry is believed to cause approximately 6% of global emissions of CO2 [1]. Moreover, CO2 emissions are believed to be responsible for anthropogenic effect on climate change. In such a context, there is a need for more sustainable construction materials and production processes. Supplementary cementitious materials and alternatives to OPC have attracted attention. One such example are inorganic cementitious binders known as “geopolymeric cements”. Geopolymers are formed by reacting an alkaline solution such as sodium silicate or sodium hydroxide with an aluminosilicate source such as fly ash, metakaolin, or slag. Fly ash-based geopolymer concrete, in particular, with its excellent engineering properties, is reported to be a sustainable alternative construction material [2]. Geopolymer technology offers an economically workable alternative to inorganic cements in a range of applications including refractory and fire-proof adhesives [3,4]. Geopolymers exhibit high chemical and thermal stability, and have excellent adhesive behaviour, mechanical strength, and long-term durability. The production of geopolymers involves a fraction of CO2 emission making it an environmentally superior process [5]. Such attributes ensure
that geopolymers continue to attract attention as a material of promise concerning the fabrication and application of new materials. Geopolymers suffer brittle failure and sensitivity to cracking as do other ceramics [6–9]. On loading, short disturbed microcracks form. Such microcracks combine to create macrocracks where the composite fails to withstand additional load. The brittle failure and inherent sensitivity to cracking of geopolymers imposes constraints on structural design and undermines durability [10]. Reinforcement of cementitious composites with microfibres has been applied as a useful technique for overcoming material property drawbacks. Microfibres directly impede fracture evolution through arresting and delaying the growth and propagation of microcracks, and indirectly by impeding the coalescing of such to form macrocracks. Microfibres addition also serves to improve the post-peak tension-softening behaviour of brittle materials under tensile load [11]. Microfibres obstruct crack pathways transmitting stress to the interfacial bond between the matrix and the microfibres [12]. Polyvinyl alcohol microfibres have been found to improve material performance in cementitious composites through limiting crack width and quantity in concrete [12]. Recent research has focused of microscopic reinforcement of brittle materials as a means to improve mechanical properties, reduce cracking tendency, and ultimately enhance toughness and ductility. Banthia and Dubeau studied the effect of the carbon and steel micro-fibre reinforcement on cement composite properties [13]. The pair found that it was the carbon micofibres, as opposed to the steel microfibres, that provided strengthening and toughening. Carbon microfibre-reinforced composites exhibited peak loads at greater displacements compared to such of steel
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T. Alomayri / Journal of Asian Ceramic Societies 5 (2017) 334–340
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Table 1 Properties of glass fibre.
Glass fibre
Tensile strength (MPa)
Modulus of elasticity (GPa)
Water absorption
Alkali resistance
Corrosion resistance
Color
1700
72
