Highly Reactive Metakaolin Concrete – Properties and Applications
Fig.4: Drying Shrinkage of Controlled Concrete and Metakaolin Concrete. Durability of Hardened Concrete Incorporating Highly Reactive Metakaolin Air entrained concrete containing about ten percent of metakaolin by mass supremely withstand ingression of chloride ions and has outstanding durability to repeated cycles of freezing and thawing ...
The effect of metakaolin on alkali–silica reaction in concrete
— 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 …
Mechanical and Durability Evaluation of Metakaolin as …
— This study investigates the effect of variable percentages of metakaolin (MK) on the mechanical and durability performance of concrete. Kaolin clay (KC) was used in the current research to prepare the MK by the calcination process; it was ground in a ball mill to its maximum achievable fineness value of 2550 m 2 /Kg.
Utilization of nano-metakaolin in concrete: A review
— 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 …
Use of metakaolin as a supplementary cementitious …
metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigated concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali‐Silica Reaction (ASR), and
Effects of metakaolin on properties and microstructure of …
— 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]
Mechanical properties prediction of metakaolin and fly ash
— Geopolymers, which belong to the family of inorganic polymers, have emerged as a promising alternative to traditional cement-based materials due to their …
Durability study and mechanism analysis of red mud-coal metakaolin …
Download Citation | On Dec 1, 2023, Wei Song and others published Durability study and mechanism analysis of red mud-coal metakaolin geopolymer concrete under a sulfate environment | Find, read ...
Shrinkage Mechanism of Laterite Modified by Lime and Metakaolin
— 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.
Study on mechanical properties and mesoscopic damage mechanism …
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 …
Optimization mechanism of metakaolin on micro …
— 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
(PDF) A Comprehensive Effects Review of Using …
— 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 ...
Chapter2 Metakaolin
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 …
Study on macroscopic mechanical properties and …
— 1. Introduction. Concrete material is extensively used in modern construction industry duo to its economy, reliability and applicability [1].In the various components of concrete, aggregate accounts for more than 60% of the total volume [2].The world consumes about 40 billion tons of aggregate every year [3], and the mining of …
The preparation, property and hydration mechanism of ultra …
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).
Improvement in chloride immobilization of cement-metakaolin system …
— 1. Introduction. In the construction of marine concrete structure, the substitution of river sand by sea sand and coral sand is conducive to reduce the transporting cost and enhance construction efficiency (Bendixen et al., 2019).However, the free chloride ions introduced from sea sand and coral sand would cause the corrosion of …
Understanding the dissolution of metakaolin in sodium …
— 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 …
(PDF) Geopolymer concrete with metakaolin for …
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...
Improving the sulfate attack resistance of concrete by using
— 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 …
Nanomaterial in cement industry: a brief review
— 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 …
Geopolymer concrete with metakaolin for sustainability: a …
— 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).
Study on multi-scale dynamic mechanical properties of metakaolin
— 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 …
The Effect of Volcanic Stone and Metakaolin on the …
— 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 …
Engineering performance of metakaolin based concrete
— 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 …
Study on macroscopic mechanical properties and …
— The sodium sulfate resistance of recycled concrete (RC) under dry-wet (DW) cycle was studied, and the mesoscopic damage mechanism of RC under uniaxial compression was revealed by using statistical damage theory. The substitution rate of metakaolin (MK) and the number of DW cycles were considered in the test variables. …
Influence of metakaolin on the properties of mortar and concrete…
— The influence of calcium hydroxide content was due to different hydration mechanisms: ... In concrete mixtures, metakaolin replaced either cement or sand in percentages of 10% or 20% by weight of the control cement content. The strength development of metakaolin concrete was evaluated using the efficiency factor (k value).
Study on mechanical properties and mesoscopic damage mechanism …
— 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 …
Red mud-metakaolin based cementitious material for …
— 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.
Metakaolin in Concrete: Its Properties, …
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 …
Durability analysis of metakaolin recycled concrete under
— Abstract. This study aims to enhance the durability, cost-effectiveness, and sustainability of recycled fine aggregate concrete (RFAC) subjected to the combined …
Metakaolin
— Metakaolin appears to have an excellent potential as a supplementary cementitious material in structures made of high-performance concrete, because it …
Metakaolin
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 …
Dissolution behaviors and mechanisms of metakaolin in …
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 …
Influence of pozzolanic addition on strength and …
— 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 …