metakaolin pozzolanic material
Metakaolin is the anhydrous calcined form of the clay mineral kaolinite. Minerals that are rich in kaolinite are known as china clay or kaolin, traditionally used in the manufacture of porcelain. The particle size of metakaolin is smaller than cement particles, but not as fine as silica fume.
Metakaolin is a dehydroxylated form of the clay mineral kaolinite. Metakaolin is commonly used in the production of ceramics, but is also used as cement replacement in concrete. Metakaolin has a smaller particle size (∼1–2 μm) and higher surface area compared with portland cement, but a larger particle size than SF.
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.
Lime- metakaolin hydration products: a microscopy analysis
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Metakaolin (MK) is nowadays a well-known pozzolanic material being used in cement- based materials, like mortars and concretes. The reaction of MK with calcium hydroxide yields cementitious products, being calcium silicate hydrate (CSH), stratlingite (C2ASH8)
Effects of metakaolin and silica fume on properties of concrete
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Metakaolin is a relatively new mineral admixture for concrete. It is comparable to silica fume in pozzolanic reactivity, but is lower in price. The effects of metakaolin and silica fume on various properties of concrete were investigated and compared in this study. Seven
Influence of chemical and mineralogical composition of metakaolin on mortar characteristics
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Three different metakaolins processed by a Portuguese factory were studied aiming to assess the influence of chemical and mineralogical composition of metakaolin on mortar characteristics. Mineralogical analysis of both the fine and clay fractions was carried out by X
The effect of metakaolin on concrete properties
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In this paper the effect of metakaolin addition on the concrete properties is investigated. Metakaolin , produced by controlled thermal treatment of kaolin, can be used as a concrete constituent, since it has pozzolanic properties. A poor Greek kaolin has been thermally
Strength and durability properties of high performance concrete incorporating high reactivity metakaolin
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Concrete is probably the most extensively used construction material in the world. The addition of mineral admixture in cement has dramatically increased along with the development of concrete industry, due to the consideration of cost saving, energy saving
A review on use of metakaolin in concrete
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Concrete is the most commonly used material for construction. The worldwide production of cement has greatly increased since 1990. Production of cement results in a lot of environmental pollution as it involves the emission of CO2 gas. Supplementary cementitious
Properties of High-performance Concrete ContainingHigh Reactivity Metakaolin
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High Reactivity Metakaolin (HRM) is an engineered pozzolanic mineral admixture, reacting aggressively with calcium hydroxide which results in significant performance of concrete. HRM has been introduced to be a beneficial alternative for silica fume, required in the
Benefits of Metakaolin in HPC
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Metakaolin is produced by heat-treating kaolin, a natural, finely divided, aluminosiliceous mineral, which is found in abundance in North America in Georgia, South Carolina, and Saskatchewan. Heating to 1200 to 1650 F (650-900 C) alters its structure, producing a
Influence of metakaolin on resistivity of cement mortar to magnesium chloride solution
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An experimental study for the resistance of mortar specimens incorporating 0%, 5%, 10%, 15%, 20%, 25% and 30% metakaolin [produced by firing Kaolin at 820 C for 2 hrs (MK)] to the magnesium chloride solution was reported. Results confirmed that mortar specimens
High volume metakaolin as cement replacement in mortar
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The compressive strength, density and ultrasonic pulse velocity of mortar containing high volume of metakaolin (MK) as partial substitution of cement is determined. Up to 50% of MK was used to replace cement in increment of 10. After demoulding, specimens were cured in
Improvement of rheological behaviour of cement pastes by incorporating metakaolin
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An experimental rheological investigation was conducted to evaluate the performance of Algerian metakaolin MK on cement pastes. In the present work, several rheological tests were carried out at 20 C, by using the stress controlled rheometer AR2000, on the fresh
Metakaolin -Pozzolanic material for cement in high strength concrete
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The infrastructure development is an important aspect for the overall development of country. India is developing as a major hub for service industry, automobile industry and for which the infrastructure development plays an important role. In case of infrastructure
A new approach to metakaolin dealumination
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One of the millennium goals is development of energy saving processes and cleaner environment. In this study, a novel approach to metakaolin dealumination to produce alum from kaolin has been described. It majorly involves captivating the self generated energy as
Effect of temperature on hydration kinetics and stability of hydration phases of metakaolin -lime sludge-silica fume system
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The use of pozzolanic materials as a blended component of Portland-pozzolan cements production is generally associated with significant savings in energy and reducing the solid wastes . Although cost saving was probably the original reason for the development of
Metakaolin inclusion: Effect on mechanical properties of concrete
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Nowadays there is an increasing trend of utilization of waste/non-conventional materials in cement and concrete matrices. These materials are often used as a part replacement of cement reducing the cost of construction and help to overcome the deficiencies associated
Early age autogenous shrinkage of UHPC incorporating very fine fly ash or metakaolin in replacement of silica fume
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This research focuses on the development of the autogenous shrinkage of UHPC since casting time. One of the purposes of this research was to analyse the possibility to substitute the silica fume normally used in UHPC by another pozzolan in order to minimize the
Effect of composition on structure and mechanical properties of metakaolin based PSS-geopolymer
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Geopolymer is a type of cross linked long-chain inorganic compound, built in three- dimensional structures and has different attractive properties (thermal, mechanical, chemical, etc). This study elucidated the structure and mechanical properties of PSS type
Intrinsic microstructure and properties of metakaolin -based geopolymers
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Davidovits first coined the term geopolymer to describe an aluminosilicate binder formed at ambient temperatures by the reaction between alkali-silicate solutions and aluminosilicate minerals or glasses . Geopolymers are X-ray amorphous (Rahier et al. referred to
Study of hydration products in the model systems metakaolin lime and metakaolin lime gypsum
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Possible preferential formation of ettringite instead of required calcium silicate hydrate (CSH) and calcium aluminosilicate hydrate (CASH) phases when aluminosilicates were added to the blended cements was investigated on the model systems comprising of
Strength Studies on Metakaolin Blended High-Volume Fly Ash Concrete
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The usage of blended cement is growing rapidly in construction industry due to the considerations of cost saving and environmental protection. The addition of fly ash in concrete improves certain properties such as workability, later age strength development