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The optimization of metakaolin (MK) in pre-cured geopolymer concrete involves developing predictive models to capture the interplay of various influencing factors and guide …
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As a starting material for the production of the geopolymer metakaolin, slag or alumosiliceous fly ash are commonly used [7,8]. Metakaolin is a dehydroxylated form of the clay mineral kaolinite and its structure is based …
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Metakaolin, produced by calcining kaolinite at high temperature, is a pozzolanic material, suitable to be used in concrete mixes. This paper reviews the research published on …
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Metakaolin which is commonly used as an admixture or partial replacement of cement owing to its most effective pozzolanic properties, which improve the microstructure and strengthen the mechanical ...
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The role of chemistry and fineness of metakaolin on the fresh properties and heat resistance of blended fly ash-based geopolymer
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Due to the high pozzolanic reactivity and small fineness, metakaolin plays a considerable role in the pore structure evolution of cementitious materials through a number of physical and chemical effects.
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As it is known, Kaolinite is calcined to yield Metakaolin. For improving mortars and concrete's mechanical and durability properties, pozzolanic materials have been extensively used. This...
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1 1 The Role of Zinc in Metakaolin-Based Geopolymers 2 Lei Wang1,2,3, Daniel A. Geddes1, Brant Walkley1,4, John L. Provis1, Viktor Mechtcherine3, 3 Daniel C.W. Tsang2, * 4 5 1 Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield 6 Building, Mappin St, Sheffield S1 3JD, United Kingdom. 7 2 Department of Civil and …
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As a low-carbon alternative to the traditional portland cement, geopolymers are produced via the alkali-activation of aluminosilicate precursor powders, normally metakaolin or fly ash. By eliminating the processes of limestone decomposition and high-temperature calcination during the cement manufacturing, the production of geopolymers could ...
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The substitution of 10 and 15% by weight of cement by metakaolin in the concrete with 12% of cement which provided, respectively, an increase of 12 and 6% in compressive strength compared to ...
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The microstructure properties of Metakaolin-UHPC play a crucial role in determining its overall performance, including its strength, durability, and resistance to cracking. ... Adding 5 wt% nano-metakaolin to cement mortar with 30 wt% FA reduced the water permeability coefficient by 73 % at 7 days compared to cement mortar with 30 wt% FA added, ...
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While most research focuses on the effect of SCMs on cement hydration, the role of the cement on SCM pozzolanicity should also be acknowledged. ... J. Skibsted, Aluminum incorporation in the C–S–H phase of white Portland cement–metakaolin blends studied by 27Al and 29Si MAS NMR spectroscopy, J. Am. Ceram. Soc. 97 (2014) 2662–2671, http ...
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Cement concrete is the most widely applied building material worldwide, with more than 30 billion tons annually (Monteiro et al., 2017). The CO 2 emissions, energy, and natural resources consumption for concrete constructions are massive (Andrew, 2018). Every ton of cement production consumes about 1.3 tons of raw materials (e.g., clay and limestone) and …
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In this study, the effects of metakaolin (MK), as a replacement for the Portland cement, in the ratios of 0%, 10% and 20% by cement weight and steel fiber (SF) dosages of 0%, 0.25%, 0.5%, and 1% ...
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TG results showed that metakaolin promoted the formation of additional hydration products at 3d, implying that the pozzolanic reaction of metakaolin was accelerated. MIP …
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Metakaolin has been shown to play a significant role in the pore structure evolution of cementitious materials due to its high pozzolanic reactivity and small fineness. In this work, the early-age evolution of pore structure of moderate heat Portland cement (MHPC) pastes incorporating metakaolin is studied using an innovative impedance approach.
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Blended cement mortars were prepared from ordinary Portland cement (OPC), with different contents of metakaolin (MK) that produced by firing Kaolin at 820oC for 2 hrs in the ratios of 0, 10, 15 ...
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Metakaolin improves the mechanical properties and durability of MPC. Metakaolin decreases the early-term hydration heat of MPC and the total porosity. Mechanisms of …
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The present study reports the results of investigation on the role of metakaolin in the formation of ettringite in a model relevant to Portland cement. The model consists of ternary system () metakaolin–lime–gypsum. Five samples of defined ternary system were cured at different temperatures 20, 30, 40, 50 and 60 °C. Conduction calorimeter TAM AIR was mainly …
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After 112 days of curing in 50% relative humidity, the drying shrinkage of controlled concrete was higher than metakaolin concrete by approximately 20%. Figure-4 show the drying shrinkage of both controlled and metakaolin …
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9 HPC Bridge Views Issue 67 May/June 2011 Reaction in Concrete," Cement and Concrete Research, Vol. 30, 2000, pp. 339‐344. 7.
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Hence, there is an increased need for alternate binder systems with the ability to reduce the effects of chloride attack in concrete. This paper presents a critical review of the …
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There is a considerable need for promoting the use of cement replacement materials. This study investigates the effect of variable percentages of metakaolin (MK) on the …
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either cement or sand in percentages of 10% or 20% by weight of the control cement content by metakaolin. The efficiency factor (k-value) was used to evaluate the strength development of metakaolin concrete. The produced metakaolin as well as the commercial one imparts a similar behavior with respect to the concrete strength. Both
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In recent years, the utilization of supplementary materials has played an important role in development of high strength concrete, improving the overall properties of concrete and rendering sustainability to concrete construction. ... Compressive strength, chloride diffusivity and pore structure of high performance metakaolin and silica fume ...
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This research demonstrated the influence of integrating glass aggregate and metakaolin wherein coarse aggregate was substituted by 10%, 15%, 20%, 25%, and 30% glass cullet (by weight), and cement ...
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THE 9TH INTERNATIONAL CONFERENCE ON ALKALI-AGGREGATEREACTION IN CONCRETE 1992 ROLE OF METAKAOLIN IN SUPPRESSING ASR IN CONCRETE CONTAINING REACTIVE AGGREGATE AND EXPOSED TO SATURATED NaCl SOLUTION ... Portland cement (OPC) in a concrete mixture was replaced by metakaolin. Only 10% …
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The methodology involved replacing cement with metakaolin at varying percentages by mass (0%, 5%, 10%, 15%, 20%, and 25%), maintaining a consistent water-to-cement ratio of 0.35, and utilizing the superplasticizer Aeromax 400 to ensure adequate workability. ... The results depict that metakaolin can play an important role in enhancing the …
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The findings in this paper contribute to understanding of the roles of metakaolin in. ... Metakaolin Blends. Cement Concr. Compos. 2011, 33, 46–54. [CrossRef] 43.
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Chloride binding is investigated for Portland cement–metakaolin–limestone pastes exposed to CaCl 2 ... that calcium in the exposure solution plays an important role in enhancing chloride binding for both hydrated Portland cement and blended cements. The role of calcium on chloride binding will be further discussed in Section 3.5. Download ...
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