Metakaolin is in widespread use all over the world in the concrete industry. The main aim of the present investigation to study the effect of metakaolin and flyash on strength of concrete with partial replacement of cement, focused on the use of less energy intensive materials such as fly ash. The high strength, high performance, fiber reinforced, polymer concrete composites and ready mixed concrete have been progressively introduced for specific applications. The use of permeable concrete for ground water recharge pdf. Effect of metakaolin on the chloride ingress properties of concrete vol. Metakaolin is a dehydroxylated form of the clay mineral kaolinite. M25 grade of concrete was designed as per the indian standard code of practice. Concrete is a mixture of cement blended with water and various sizes of aggregates. Effect of metakaolin content on the properties of high. Minerals that are rich in kaolinite are known as china clay or kaolin, traditionally used in the manufacture of porcelain. Of these metakaolin is one mineral admixture that appears to have significant potential for the production of highstrength and highperformance concretes. The influence of metakaolin on the modulus of elasticity of. Such a concrete exhibits favorable engineering properties.
Mk mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 mpa and 100 25 mm. In the past limebased cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as a calcium aluminate cement or with portland cement to form portland cement concrete for its visual resemblance to. The future and use of supplementary cementitious materials metakaolin presented by a. Durability of hardened concrete incorporating highly reactive metakaolin. Increasing the compressive strength of portland cement. Acid stain needs the calcium hydroxide to react, and without enough of it in the concrete, the acid stain color might not develop enough, or even not develop at all. The pozzolan for decorative concrete concrete decor. Usually 8% 20% by weight of portland cement replaced by metakaolin. This study explores the complex causes of instability in foamed concrete by. Metakaolin is a pozzolan, probably the most effective pozzolanic material for use in concrete.
The implication of metakaolin in quarry dust concrete in terms of strength and corrosion resistive properties was investigated by various experiments and the results are discussed below. Compressive strength of previous concrete at 7, 14, and 28 days properties. Sep 10, 20 this study presents the effect of incorporating metakaolin mk on the mechanical and durability properties of high strength concrete for a constant waterbinder ratio of 0. Concrete is a mixture of cement, water and aggregate. The particle size of metakaolin is smaller than cement particles, but not as fine as silica fume. The compressive, split tensile and flexural strength results obtained after 3, 7, 28 and 90 days are shown in fig. Concrete is the second largest material consumed by human beings after food and water as per who. Powerpozz hrmwill also enhance the concrete rheology, providing a smoother, creamier mix that improves the handling and finishing characteristics of the concrete. The material is purified to remove compounds that could discolor concrete, and then calcined under controlled heat to create an amorphous aluminosilicate that is reactive in concrete. Pdf on dec 11, 2019, sakthi prasanth and others published mechanical properties of. Measurement of setting time american concrete institute. Strength and duriabilty properties of concrete with partial. The significant breakthrough in metakaolin mixtures.
Mar 01, 2006 the use of mineral admixtures is widely accepted, because of several improvements possible in concrete composites and the overall economy. In its most basic form, concrete is a mixture of portland cement, sand, coarse aggregate and water. The use of glass as a fine aggregate in portland cement concrete has been studied and some countries currently use this material. Today, most concrete mixtures contain supplementary cementitious materials that make up a portion of the cementitious component in concrete. Cement substitution by a combination of metakaolin and limestone. Bridge deck highreactivity metakaolin hrm concrete overlay effective. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. Effect of metakaolin on strength and efflorescence quantity. From the optimization 20% cement replacement by metakaolin superior than all the mixes. Drying shrinkage of controlled concrete and metakaolin concrete. The aggregate consists of a mixture of various sizes of gravel and sand. Mechanical properties for cement replacement by metakaolin. The slump is a measure representing the workability of concrete. Advanced cement technologies metakaolin and silica fume.
The advantages of metakaolin are not only the many concrete performance benefits, both in. Concrete is a composite material composed of fine and coarse aggregate bonded together with. Compressive strength and efflorescence quantify using matrix. Concrete is the most wellknown, prevalent and comprehensively used building material worldwide with its usage almost doubling the mutual utilization of other materials like wood, steel and plastics. Aac is a light building material obtained by bringing of. Feb 27, 2005 metakaolin is produced from kaolinite, a mineral found in kaolin clay also known as china clay. Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement cement paste that hardens cures over time. Metakaolin is a valuable admixture for concrete andor cement applications. Based on the experimental investigations carried out, the following conclusions are taken 1.
Metakaolin, available in our country indigenously, is used for paint industries, but scarcely for concrete applications. Highly reactive metakaolin has become available as a considerably reactive pozzolanic material in concrete. This work shall consist of the preparation of the existing concrete bridge deck and the construction of a highreactivity metakaolin hrm concrete overlay to the specified thickness. The principal cementitious material in concrete is portland cement. This study aimed to use metakaolin and blast furnace slag as main raw materials in the production of autoclaved aerated concrete aac. Astm c 989 ggbfs, astm c 1240 silica fume, and astm c 618 class n metakaolin have the potential to mitigate alkalisilica reaction in concrete containing. Publishers pdf, also known as version of record includes final page. If this resource can be tapped for concrete application, the cost of highperformance concrete the cost of highperformance concrete can be brought down significantly. Metakaolin pozzolanic material for cement in high strength.
Effect of metakaolin dispersion on the fresh and hardened. Volume 2, issue 8, august 2016 effect of metakaolin and. Dhinakaran 2012 studied the strength increases by mk concrete is effective only at the early age of concrete and in the long term the strength increase is only marginal. This study investigated the basic mechanical and microscopic properties of cement produced with metakaolin and quantified the production of residual white efflorescence. It is a product that is manufactured for use rather than a byproduct and is formed when china clay, the mineral kaolin, is heated to a temperature between 600 and 800. It is obtained by calcination of kaolinitic clay at a temperature between 500c and 800c. The target 28 day strengths for normal and high strength concrete were 34 and 68 mpa, respectively. Strength and duriabilty properties of concrete with.
Experimental study on strength of concrete by using metakaolin. Mechanical properties and chloride permeability of normal and high strength concrete containing a mineral admixture called metakaolin are presented in this paper. One of them is the ability to disperse the mk particles throughout the concrete matrix in order to obtain the best results. Concrete is a composite material, which is made from a mixture of cement, aggregate sand or gravel, water and sometimes admixtures in. Introduction concrete is a vital ingradient in infrastructure development with its versatile and extensive applications. The various ingredients for one cubic meter of m25 grade concrete is shown in table 4. Pdf mechanical properties of concrete with metakoalin as an. An important achievement in the use of fly ash in concrete is the development of high volume fly ash hvfa concrete that.
This dissertation is organized following the university of arizonas graduate college manual for. There have been remarkable advances in the field of concrete technology also. The pozzolanic reaction starts soon and continues between 7 to 28 days. Fundamentals of concrete materials testing and inspection. Because metakaolin aggressively consumes calcium hydroxide, acid staining concrete with metakaolin added to it might lead to disappointment. Shrinkage of the concretes containing mk is not significantly different from the concrete mkc20 but. Marisca, regional sales manager, basf kaolin 312017 1 virginia concrete conference march 23, 2017. The effect of irans metakaolin in enhancing the concrete. Several aspects must be considered in order to achieve this work objective, the study of the effect of mk on the fresh and hardened state properties of concrete. Contractors are finding it difficult to obtain class f fly ash for concrete paving projects, but cdot specifications do not currently. Highly reactive metakaolin concrete properties and applications the reactivity of metakaolin is based on chemical composition and reactive surface. This study shows coupled substitutions of metakaolin and limestone for portland cement can give excellent performance at relatively early ages. From the beginning of researches in concrete, the researchers and scientists have. As the nanosilica is available in the colloidal form, the quantity of water required for making concrete is adjusted to account for the water available in.
Strengthening of cement concrete using fly ash and metakoline. Metakaolin is the anhydrous calcined form of the clay mineral kaolinite. The substitution of 10 and 15% by weight of cement by metakaolin in the concrete with 12% of cement which provided, respectively, an increase of 12 and 6% in compressive strength compared to. In this experimental work, the slump value of fresh concrete was in the range of 40 mm to 63 mm.
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