DOI: 10.1016/j.jclepro.2024.142382 Corpus ID: 269476274; Utilization of carbonated alkaline solid wastes in ordinary Portland cement-metakaolin-limestone ternary mixture: underlying the role of low grade-sustainable calcium carbonate sources
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DOI: 10.1016/j.cemconres.2020.106194 Corpus ID: 224903099; The role of zinc in metakaolin-based geopolymers @article{Wang2020TheRO, title={The role of zinc in metakaolin-based geopolymers}, author={Lei Wang and Lei Wang and Lei Wang and Daniel A. Geddes and Brant Walkley and John L. Provis and Viktor Mechtcherine and …
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Learn about highly reactive metakaolin, a pozzolanic material produced from calcined kaolin clay, and its effects on fresh and hardened …
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The role of Zn, a known retardant used in Portland cement, in geopolymer systems is not well understood. ... (2020) The role of zinc in metakaolin-based geopolymers. Cement and Concrete Research, 136. 106194. ISSN 0008-8846 Abstract. Geopolymers are low-calcium, sustainable cementitious materials. The role of Zn, a known retardant used in ...
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What is Metakaolin? Metakaolin is a pozzolan, probably the most effective pozzolanic material for use in concrete. It is a product that is manufactured for use rather than a by-product and is formed when china clay, the mineral kaolin, is heated to a temperature between 600 and 800ºC. Its quality is controlled during manufacture, resulting in ...
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Recent studies have demonstrated that in the presence of limestone (CaCO3), carbonate-AFm phases (i.e., hemi- and/or mono-carboaluminate) may be stabilized at the expense of sulfate-AFm, which is more commonly found in cement systems. This suggests that enhancing AFm phase formation may be a novel way of incorporating increased …
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Metakaolin on reaction with Ca(OH) 2, produces CSH gel at ambient temperature and reacts with CH to produce alumina-containing phases, including C 413, C 2 ASH 8, and C 36 (g et al., 1995, Zhang and Malhotra, 1995). Metakaolin had 99.9% particles < 16 µm with a mean particle size of about 3 µm (Table …
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Long term durability properties of concrete modified with metakaolin and polymer admixture. Construction and Building Materials, Volume 172, 2018, pp. 41-51 ... Adel Al Menhosh, …, Levingshan Augusthus-Nelson. The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach. …
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1. Introduction. Manufacturing of Portland cement is a major source of global carbon dioxide (CO 2) emissions, making up approximately 5%–7% of global CO 2 emissions from industrial and energy sources [1].Geopolymer can be considered as an alternative material to Portland cement [2] owing to its benefits in terms of energy …
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Influence of Metakaolin in Concrete as Partial Replacement of Cement, International ... In the today's world concrete plays an important role in the construction works like dams, buildings ...
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The utilisation of calcined clay in the form of metakaolin as a pozzolan for concrete has received considerable interest in recent years. The use of metakaolin as a mineral admixture for concrete is a well-documented practice. Metakaolin is a quality enhancing pozzolan for concrete. In this review paper the work done by various …
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This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of 0.3. MK mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was …
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Metakaolin is a supplementary cementitious material that conforms to ASTM C 618, Class N pozzolan specifications 1. Sinngu et al. 1 evaluated South African metakaolin as a cement extender. In ...
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Concrete with the metakaolin powder presented a strength of 609 kgf/cm2 (59.7 MPa), which corresponds to M9 (concrete containing 15% metakaolin), consistent with 116% improvement with respect to ...
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DOI: 10.1016/J.CONBUILDMAT.2019.116675 Corpus ID: 202216449; Roles of metakaolin in magnesium phosphate cement: Effect of the replacement ratio of magnesia by metakaolin with different particle sizes
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The dead burnt magnesia used in this study was obtained through calcination at a temperature of 1500 °C. Its specific surface area is 163 m²/kg, and the laser particle size analysis results are shown in Fig. 1.The chemical composition of the dead burnt magnesium oxide is presented in Table 1.Additionally, Table 2 displays the chemical …
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This can be ameliorated by adding small quantities of lime and cement, which creates a strongly alkaline environment; unfortunately, the improvement is not long-lasting. ... We attempted to counteract this by adding metakaolin, which can capture calcium ions and form a stable binder in the solidified soil. The resulting material proved …
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It was shown that concrete containing metakaolin produced higher strengths and improved durability when compared to the control (Figure 7). 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) …
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DOI: 10.1016/J.CEMCONCOMP.2021.103999 Corpus ID: 233567290; The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach @article{Cai2021TheRO, title={The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach}, …
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Huseien et al. [] found a deceleration of the initial and final setting time of AAS mortar mixtures activated with NaOH and sodium silicate solution by partially replacing slag with 5–15% MK.The incorporation of 5%, 10% and 15% MK decelerated the initial setting time by ~169%, ~236% and ~284%, respectively, whilst the final setting time was …
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The current article highlights the positive effects of metakaolin on the mechanical and durability properties of cementitious materials. Metakaolin reacts with …
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However, with the ongoing hydration process of cement-metakaolin blended mixture, the compressive strength of cement mortar with the rise of metakaolin became obvious higher in relative to the reference cement mortar without metakaolin at the age of 3 d. ... The role of particle size on the performance of pumice as a supplementary …
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The suggested mechanism for colloidal stability and fluidity of metakaolin-based cements (e.g. Portland cement blends and alkali-activated cements) is explained by changes in the distribution and ...
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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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Based on the results obtained, the optimum proportion of metakaolin replacement in cement sand bricks making is 15% by virtue of its having the lowest thermal conductivity value of 0.580 W/mK and ...
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Adding 0.3 % silica gel to concrete and replacing cement with metakaolin by 0, 10 & 15% by weight of cement can improve the mechanical properties of concrete View Show abstract
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1. Introduction. High-reactivity metakaolin 1 () is a mineral admixture, which is relatively new to the concrete industry that has the potential for improving the durability of concrete. differs from the more commonly used mineral admixtures, such as fly ash and silica fume, in that it is not a by-product; it is manufactured under a …
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Metakaolin was added to the mixture of high performance concrete in the range from 0 to 25% weight of cement. The comparison of metakaolin and microsilica, which is often used by concrete ...
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observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments. Keywords: Metakaolin; Concrete penetrability; Alkali‐Silica Reaction; Carbonation Introduction Metakaolin, also referred to as highly reactive calcined clay, is
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DOI: 10.1016/J.CEMCONRES.2017.02.003 Corpus ID: 99533858; Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends @article{Shi2017RoleOC, title={Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends}, author={Zhenguo Shi and Mette Rica Geiker …
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1. Introduction. Cement significantly contributes to CO 2 emissions due to high energy consumption during its production [1], [2].The direct CO 2 emissions intensity increased from 0.54 tCO 2 to 0.59 tCO 2 per ton cement production between 2015 and 2021 [3].CO 2 emissions could be reduced by using alternative green materials and …
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This work researched into the use of metakaolin as a partial substitute for cement in concrete, metakaolin was obtained by the calcination of kaolin clay to about 700 0C Cement was replaced with ...
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Metakaolin (MK) is an effective cementing material to improve the workability of concrete and reduce the usage of cement (Siddique and Klaus, …
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Geopolymers are low-calcium, sustainable cementitious materials.The role of Zn, a known retardant used in Portland cement, in geopolymer systems is not well understood.This study scrutinises the effect of Zn on metakaolin-based geopolymer reaction mechanisms and kinetics, and investigates the incorporation mechanism of Zn …
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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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Metakaolin is an anhydrous aluminosilicate obtained by the thermal decomposition of kaolin, a naturally occurring clay. It is used as a pozzolanic additive in cement and …
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