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Effects of Calcium on Setting Mechanism of Metakaolin-based Geopolymer Xu Chen‡†, Andre Sutrisno§, Leslie J. Struble‡ ‡ Department of Civil and Environmental Engineering, University of Illinois at Urbana Champaign, 205 N. Mathews Ave., Urbana, IL 61801 §NMR/EPR Laboratory, School of Chemical Sciences, University of Illinois at Urbana
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mechanism. Furthermore, the results obtained indicate that the use of FA and MK, for partial replacement of cement in concrete, is effective in the inhibition of expansion by DEF. 1. INTRODUCTION The use of supplementary cementing materials, like fly ash (FA) and metakaolin
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This paper presents the mechanism and chemistry behind the geo-polymerization and its application in development of Geo-polymer concrete. In this paper, guidelines to develop a geo-polymer concrete is discussed along with the factors affecting the geopolymerization process in concrete. It is concluded that curing temperature, ratio of alkaline liquids, chemical ratio of silicate and sodium in
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This paper presents the mechanism and chemistry behind the geo-polymerization and its application in development of Geo-polymer concrete. In this paper, guidelines to develop a geo-polymer concrete is discussed along with the factors affecting the geopolymerization process in concrete. It is concluded that curing temperature, ratio of alkaline liquids, chemical ratio of silicate and sodium in
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test on concrete were carried out by replacing 0 to 30% cement by metakaolin with 10% increment. Consistency of cement paste was found increased with enhancing of metakaolin percentage while reduction occurred in the workability of concrete. Compression,
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suitability of partially replacing cement with metakaolin in self curing concrete is also studied. 1.2 Mechanism of Self Curing It is important to know the mechanism behind the process of internal curing. In normal concrete what usually happens is the continuous evaporation of moisture from an exposed surface due to the difference in
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5.10.2020· Three sample groups were created: an ordinary concrete mix (0% metakaolin), concrete containing 8% MK235 (by mass), and concrete containing 8% MK349 (by mass). Superplasticisers were added to the MK235 and MK349 mixes to achieve a slump of 76–102 mm, with the dosage of superplasticiser increasing as the ratio decreased.
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7.7.2015· Usage of metakaolin (MK) significantly improves properties of concrete, especially those related with durability. The addition of MK to concrete influences also rheological properties (and therefore workability) of fresh mix.
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test on concrete were carried out by replacing 0 to 30% cement by metakaolin with 10% increment. Consistency of cement paste was found increased with enhancing of metakaolin percentage while reduction occurred in the workability of concrete. Compression,
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5.10.2020· Three sample groups were created: an ordinary concrete mix (0% metakaolin), concrete containing 8% MK235 (by mass), and concrete containing 8% MK349 (by mass). Superplasticisers were added to the MK235 and MK349 mixes to achieve a slump of 76–102 mm, with the dosage of superplasticiser increasing as the ratio decreased.
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The admixture metakaolin when used at optimum quantity tend to increase the strength of concrete mix when compared with conventional concrete. Metakaolin increased the compressive strength, split tensile strength and flexural strength of concrete.Akasha et al., (2008) studied the effect of metakaolin by 0%, 10%, 15% and20% replacement of Portland
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strength concrete. The inclusion of metakaolin results in faster early age strength development of concrete. The utilization of supplementary cementitious material like metakaolin concrete can compensate for environmental, technical and economic issues caused by cement production. Dhinakaran (2012) studied the strength increases by MK
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metakaolin in concrete to improve the mechanical properties of standard and high strength concrete. The Nano particle like Nano Alumina and pozzolanic material like metakaolin were partially replaced with cement by 1% and 15% respectively in the concrete mixtures for different grades of concrete.
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The admixture metakaolin when used at optimum quantity tend to increase the strength of concrete mix when compared with conventional concrete. Metakaolin increased the compressive strength, split tensile strength and flexural strength of concrete.Akasha et al., (2008) studied the effect of metakaolin by 0%, 10%, 15% and20% replacement of Portland
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3) Uses of metakaolin Metakaolin finds its usage in many aspects of concrete: High performance, high strength and lightweight concrete Precast concrete for architectural, civil, industrial, and structural purposes Fiber cement and ferrocement products Glass fiber reinforced concrete Mortars, stuccos, repair material, pool plasters Improved finishability, color & appearance.
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The role of metakaolin in the protection of concrete against the deleterious action of chlorides . C. P. Figueiredo I F. B. Santos II O. Cascudo II,III H. Carasek I,III P. Cachim I,V A. Velosa I,II. I Departamento de Engenharia Civil, Universidade de Aveiro, Portugal: [email protected]; [email protected] II Escola de Engenharia Civil, Universidade Federal de Goiás, Brasil
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18.3.2017· Metakaolin. Pozzolanic Action: The additive act in three ways. Filler; Nucleating; Pozzolanic; 1. Filler: These additives/admixtures are finer than cement, so when added to concrete they occupy the small pores previously left vacant. 2. Nucleating: These fine particles accelerate the rate of hydration and precipitation starts. 3. Pozzolanic:
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MK in concrete demands a good understanding of impact that these factors have on the hydration mechanism and the microstructure of the concrete. II. METAKAOLIN. Metakaolin consists of 50- 55% silica and 40-45% alumina. [3], [4]. It is obtained by calcining kaolin clay. Kaolin is a layered silicate mineral, with one tetrahedral sheet of silica
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8% metakaolin, increase in elastic modulus by 5-19% as compared to control concrete is observed. 13. Conclusion The following conclusions are drawn on the use of metakaolin in concrete making: 1. Metakaolin reduces workability. However, in certain cases with appropriate doses of plasticizers the effect is not much. 2.
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8% metakaolin, increase in elastic modulus by 5-19% as compared to control concrete is observed. 13. Conclusion The following conclusions are drawn on the use of metakaolin in concrete making: 1. Metakaolin reduces workability. However, in certain cases with appropriate doses of plasticizers the effect is not much. 2.
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