— Under high temperature, compressive and flexural strength of concrete incorporated with nano metakaolin shows increase in strength values up to temperature exposure of 250 °C . TiO 2 ... Literature witnessed that size of pores and particles geometry is responsible for the capillary water absorption mechanism. Addition of nanomaterial …
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— Possible mechanism of metakaolin influencing MPC was proposed by multi-analysis. ... Relative strength, pozzolanic activity and cement hydration in superplasticised metakaolin concrete. Cem. Concr. Res., 26 (10) (1996), pp. 1537-1544. View PDF View article View in Scopus Google Scholar [27]
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— The strength development of metakaolin concrete was evaluated using the efficiency factor (k value). ... Mechanism of hydration of the metakaolin-lime-water system. Cement and Concrete Research, 31 (2001), pp. 177-182. View PDF View article View in Scopus Google Scholar. g et al., 1995.
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— Fly ash and silica fume is used to improve the resistance of concrete to the attack in aggressive environments [2], [3]. Recently, some activated materials such as metakaolin, which is produced by heating kaolinite, have been shown to be an excellent pozzolan. ... To study the mechanism of the metakaolin–lime reaction, measurements of …
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— DOI: 10.1016/j.matchemphys.2024.129499 Corpus ID: 270009976; Optimization mechanism of metakaolin on micro-mechanical properties and pore characteristics of steel fiber-cement matrix interface
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Use of Metakaolin in concrete accelerates the initial setting time of concrete. 02. It helps in development of the early age strength of concrete which allows the early removal of formwork and thus enhances the …
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— While metakaolin, a widely used active admixture in concrete, has been extensively studied, its interaction with ground quartz and wollastonite is not as well …
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— This paper presents a critical review of the engineering properties of metakaolin (MK) based concrete exposed to chloride attack. The key advantages and …
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— Nano-metakaolin (NMK) is currently developed and applied in the concrete, and there are a mass of literatures on the properties of concrete with NMK until now. …
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— Fig. 7 demonstrates that arsenic is released due to the partial oxidation of lollingite, and the immobilization mechanism of the released arsenic can be described as follows: (i) ... Microstructural studies on eco-friendly and durable Self-compacting concrete blended with metakaolin. Appl. Clay Sci., 124–125 (2016), pp. 143-149.
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— Abstract. This study aims to enhance the durability, cost-effectiveness, and sustainability of recycled fine aggregate concrete (RFAC) subjected to the combined …
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— This paper delves into an in-depth exploration of the diverse applications of fly ash and metakaolin in geopolymer concrete, highlighting its contributions to the construction industry, environmental sustainability, and technological advancements. ... Liu JC, Wu B (2021) Mechanical properties and reaction mechanism of one-part geopolymer ...
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In recent years, there has been a growing body of research on the use of metakaolin (MK) in Ultra-High Performance Concrete (UHPC) to address the issue of unstable production yields and quality of industrial by-product Silica fume (SF). However, the current scientific literature tends to focus primarily on performance enhancements, often neglecting to …
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— Since the middle of the 20th century, extensive research work has been carried out on the production and characterization of metakaolin, on the hydration reaction mechanism, as well on the study ...
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— Metakaolin-based geopolymer concrete requires lesser temperature for curing in comparison to fly ash-based geopolymer concrete. A study reported that in the case of metakaolin geopolymer concrete, an optimum range of the temperature for curing is 32–48 °C such as exposure under sunlight or at room temperature (Al-Shether et al. 2016b).
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— This experimental study aims to investigate the engineering properties of metakaolin (MK) based concrete exposed to chloride attack. The investigation was conducted for different w/b ratios of 0.54–0.61. The MK, utilised as cementitious material, was varied from 0 to 20% with an increment of 5% and ages of concrete from 7 to 56 …
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— Metakaolin appears to have an excellent potential as a supplementary cementitious material in structures made of high-performance concrete, because it …
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— Nano materials have been widely used to improve the properties of cementitious materials.Nano-metakaolin (NMK) is currently developed and applied in the concrete, and there are a mass of literatures on the properties of concrete with NMK until now. However, a systematic review of the utilization of NMK in concrete is lacked, which …
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— Over the past few decades, ultrahigh-performance concrete (UHPC) has been widely studied and applied because of its outstanding mechanical properties, such as its high strength and notable durability. However, because of its high cost and easy shrinkage cracking during early pouring in mass concrete construction, to reduce the cost of UHPC …
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— The intent of this study is to explore the physical properties and long-term performance of concrete made with metakaolin (MK) as a binder, using microsilica (MS) and nanosilica (NS) as substitutes for a portion of the ordinary Portland cement (OPC) content. The dosage of MS was varied from 5% to 15% for OPC-MK-MS blends, and the dosage …
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— The type of precursor material affects geopolymerization. For instance, the mechanisms of halloysite and metakaolin are pretty different. The higher strength of MGP acid than that of MGP alkali is attributed to the higher reaction degree which also depends on many factors. While discussing the section about influence of various factors, the ...
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— The dissolution kinetics of metakaolin are examined at room temperature in NaOH solutions at concentrations of (0.1, 5, or 10) mol L−1 and at liquid-to-solid mass ratios (L/S) of 50 or 1000. Both the dissolved Si and Al concentrations as well as the morphology and structure of the solid are reported at various times. The dissolution rate is …
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— 1. Introduction. The proportion of construction waste in urban waste is as high as 40%, of which waste concrete blocks account for more than 60% of building waste (Xiao et al., 2012).Concrete waste recycling provides a direction for sustainable development, which can help mitigate the ecological impact of building waste and alleviate the …
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2.2 Hydration Reaction Mechanism 43 Table 2.1 Physical properties of metakaolin () Property Value Specific gravity 2.60 Bulk density (g/cm3) 0.3–0.4 Physical form Powder Color Off-White GE Brightness 79–82 Table 2.2 Typical chemical composition of metakaolin (Ambroise et al., 1994) Ingredients % by weight SiO 2 51.52 …
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— This paper presents a critical review of the engineering properties of metakaolin (MK) based concrete exposed to chloride attack. The key advantages and limitations of using MK for concrete ...
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Supplementary cementing materials. Daman K. Panesar, in Developments in the Formulation and Reinforcement of Concrete (Second Edition), 2019 3.1.4 Metakaolin. Metakaolin is an amorphous aluminosilicate that is a highly reactive natural pozzolan produced by the calcination and dehydroxilation of kaolinitic clay at temperatures …
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— DOI: 10.1016/j.conbuildmat.2023.133990 Corpus ID: 265174612; Durability study and mechanism analysis of red mud-coal metakaolin geopolymer concrete under a sulfate environment @article{Song2023DurabilitySA, title={Durability study and mechanism analysis of red mud-coal metakaolin geopolymer concrete under a sulfate environment}, …
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In recent years, there has been a growing body of research on the use of metakaolin (MK) in Ultra-High Performance Concrete (UHPC) to address the issue of unstable production yields and quality of industrial by-product Silica fume (SF).
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— When 10, 20, 40, 80, and 120 cycles were reached, the compressive strength and the mass of various groups of metakaolin concrete were tested. And the compressive-strength operation was performed according to GB/T50081-2002 specifications (GB/T 50081-2002, 2002).Since the test samples adopted in this test are …
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— Geopolymers, which belong to the family of inorganic polymers, have emerged as a promising alternative to traditional cement-based materials due to their …
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DOI: 10.1016/j.cemconres.2024.107442 Corpus ID: 267342853; Dissolution behaviors and mechanisms of metakaolin in acidic activators @article{Bu2024DissolutionBA, title={Dissolution behaviors and mechanisms of metakaolin in acidic activators}, author={Mengxin Bu and Qingrui Yang and Penghui Wang and Biqin Dong and …
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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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— 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 effects of using...
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