— 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 …

 — 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).

 — To explore the potential of modified recycled aggregate concrete for use in construction projects, the evolution of its properties in the combined effects of environment and loading was investigated. This paper considered various factors, including the replacement amount of metakaolin (0 %, 15 %), dry-wet cycles (0, 20, 60, and 120 …

DOI: 10.1016/j.dibe.2024.100332 Corpus ID: 267011116; Study on mechanical properties and mesoscopic damage mechanism of metakaolin modified recycled aggregate concrete @article{Bai2024StudyOM, title={Study on mechanical properties and mesoscopic damage mechanism of metakaolin modified recycled aggregate concrete}, author={Wei Feng Bai …

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 …

 — Abstract. This study aims to enhance the durability, cost-effectiveness, and sustainability of recycled fine aggregate concrete (RFAC) subjected to the combined …

 — The experimental investigation is done on the fresh concrete (slump test) and hardened concrete (compressive strength, split tensile strength and flexural strength) of flyash-metakaolin based geopolymer concrete. 5.1 Mix Design. In this study M30 grade conventional concrete was used as control mix.

 — Metakaolin appears to have an excellent potential as a supplementary cementitious material in structures made of high-performance concrete, because it …

 — 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]

Request PDF | On May 1, 2024, Mengya Li and others published Using metakaolin to improve properties of aged Portland cement: Effectiveness and the mechanism | Find, read and cite all the research ...

 — 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. …

 — Dissolution behaviors and mechanisms of metakaolin in acidic activators. Author links open overlay panel Mengxin Bu a, Qingrui Yang a, Penghui Wang a, Biqin Dong a, Dongshuai Hou b, Yanshuai Wang a. Show more. ... A damage constitutive model for concrete under uniaxial compression capturing strain localization. Cement and …

 — Sulfate attack is a significant durability concern for cement-based materials that threatens many concrete structures. Although this is not a new issue, in the last couple of decades, a myriad of structural members including dams, concrete pavement, bridge piers, concrete piles, buried concrete foundations, highway or railway tunnels, and floor …

 — 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.

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 …

 — 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}, …

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

 — Metakaolin-containing concretes exhibit behaviour similar to those of silica-fume-containing concretes; that is, the mechanical resistance is improved, and the permeability and shrinkage of concrete are significantly reduced . However, whether metakaolin effectively impacts water sensitivity is not known.

 — Effect and mechanism of coal gangue concrete modification by fly ash. Constr. Build. Mater., 294 (2021), p. 123563. View PDF View article View in Scopus Google Scholar [30] ... Study on composite salt Corrosion resistance of concrete by metakaolin. Nonmetallic Ores, 201, 44(01):78-80+95. Google Scholar [41] Chaohua Jiang, Ke Fan, …

 — 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 …

 — 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 …

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 …

 — 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 …

 — 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 ...

 — Geopolymers, which belong to the family of inorganic polymers, have emerged as a promising alternative to traditional cement-based materials due to their …

 — 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 …

 — 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 carefully …

 — 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 ...

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...

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).