The waste engine oil is used as additive in the concrete. In this paper, an alkali activated metakaolin based geopolymer was prepared with metakaolin, sodium hydroxide, sodium silicate and water. In its dehydroxylated form, metakaolin can be used in concrete to enhance mechanical properties and increase durability 1216, while also. The study focuses on the possibility of the use of recycled aggregate as a structural material keywords. The formula of metakaolin in the silicate chemistry is as 2 al 2 o 3. Metakaolin is the anhydrous calcined form of the clay mineral kaolinite. Evaluation of sustainable metakaolingeopolymer concrete. Use of metakaolin in concrete is of 25% in replacement of cement gave good strength results and durability improvement. Strength and duriabilty properties of concrete with partial. Abstract concrete is widely used construction materials. When used in concrete, metakaolin undergoes a pozzolanic reaction and refines the microstructure of the hydrated cement paste. Influence of metakaolin on mechanical properties of concrete. It has also been used successfully for the development of high strength self compacting concrete using mathematical 7. Metakaolin in concrete beneficial impact on performance parameters.
To study these properties following parameters were examined in the research work. The levels of replacement for cement with mk were at 0, 5, 10, 15 and 20 percent while the gp. Firstly coarse aggregate, fine aggregate are mixed. As compressive, flexural strengths and water absorption are the most significant properties for concrete paver blocks the same have been studied for various concrete mixes with varying percentages of metakaolin. The total binder used 300 kgm3 is composed of metakaolin and fly ash in percentages up to 30%, resulting in concrete with significant compressive strength and enhanced durability performance. Pozzolanic materials like metakaoline when used as cement replacement materials in concrete improves the. The use of metakaolin increases the mechanical strength of concrete. The aim of this research is to examine the mechanical properties of concrete by incorporating metakaolin in various amount percent. Also, the compressive and splitting tensile strength reduce with the increase of cwcb content, the percentage reduction is 53. Pdf evaluation of metakaolin for use in concrete ijsrd. Metakaolin are used as supplementary cementitious materials in various proportions.
An experimental investigation on metakaolin modified. Values of compressive strength of concrete with metakaolin after 28 days can be higher by 20%. Concrete metakaolin durability permeability pore size distribution abstract in this paper the effect of metakaolin on concrete durability is investigated. Two different type of mixing water were used in this study, potable water from. This is because, the use of metakaolin in concrete reduces the excessive bleeding by international journal of structural and civil engineering research vol. While silica fume is the pozzolan most commonly used when high strength concrete is required, it generally not suitable for use in lightcolored concrete. An experimental investigation on metakaolin modified concrete. Metakaolin is a dehydroxylated form of the clay mineral kaolinite.
Particulars unit value standard setting time initial minutes compressivestrength days nmm 2 days nmm 2 days nmm 2 t. Use of metakaolin as a supplementary cementitious material in. Sep 30, 2020 nowadays, nano metakaolin nmk has not been used in recycled concrete. Effects of metakaolin and silica fume on properties of concrete. Fly ash is one of the residues generated in the combustion of coal. The effects of metakaolin and silica fume on various properties of concrete were investigated and compared in this study. Metakaolin is a pozzolanic material that can be utilized to produce highly durable concrete composites. In this paper metakaolin was used to replace in four different proportion of 5%, 10%,15% and 20% and red soil by 5%,10%,15%,20%,25% and 30%.
Metakaolin is commonly used in the production of ceramics, but is also used as cement replacement in concrete. When metakaolin is added in the hydration process, it reacts with the free lime to form additional csh material, thereby making the concrete stronger and more durable. When used in concrete it will fill the void space between cement particles resulting in a more impermeable concrete. Therefore, nano metakaolin will be added into recycled concrete to form nano metakaolin recycled concrete hereinafter referred to as nanorecycled concrete, and the improvement of nano metakaolin in the mechanical properties of recycled concrete will be studied.
The concrete countertop institute your complete resource. The concrete countertop institute your complete resource for. The main objective of this thesis is to investigate the. Such a concrete exhibits favorable engineering properties. Research article the mechanical properties of the concrete. The percentage of metakaolin is varies from 0 to 20 % with as increment of 5% used in the concrete. The results showed that the use of metakaolin obtained from waste in processing kaolin, can foster greater progress in resistance and durability in dry concrete from 28 days of cure. From the literature it is clearly shows the lot of research is going on the supplementary. The cement was replaced by 5%, 10%, and 15% of metakaolin and named as mk5, mk10, and mk15 respectively. Effect of nano metakaolin on compressive strength of recycled.
Minerals that are rich in kaolinite are known as china clay or kaolin, traditionally used in the manufacture of porcelain. Metakaolin is used as the cement replacing material 5%, 10%, 15% and 20%, and foundry sand is used as sand replacing material 10%, 20%, 30% and 40% in the scc mix to improve the compressive strength and split tensile strength of concrete without any e ect on its workability with various replacement levels and chemical admixture. Understanding the benefits of high reactivity metakaolin. Strength and durability of high performance concrete using. Group leader, product development engelhard corporation introduction the purpose of this presentation is to present the unique benefits of high reactivity metakaolin hrm in cementbased systems. Super plasticizer was 3 kgm3 used in the all concrete mixes. Effect of metakaolin content on the properties of high. Concrete is the most commonly used material for construction.
Evaluation of sustainable metakaolingeopolymer concrete with. Geopolymer concrete mix with 30% cwcb showed a reduction in fresh and dry densities of 3. The interest of use of metakaolin in cement mortar and concrete is of high. Metakaolin was used as partial replacement of cement in the study and three percentages 5%. Metakaolin is a relatively new mineral admixture for concrete. Metakaolin is a pozzolan, probably the most effective pozzolanic material for use in concrete.
It also reduces the hardened concrete permeability. Furthermore, metakaolin improves concrete resistance to alkali silicate reactions and sulfate attack. Metakaolin concrete mixes over shoot the strength of opc and hence the increase in metakaolin content improved the compressive strength and split tensile strength up to 15% cement replacement, thus encouraged the use of metakaolin, as a pozzolanic material for partial replacement in producing high performance concrete. Preparation and properties of alkali activated metakaolin. Compressive, tensile and flexural strength and elastic modulus will be measured at various concrete ages.
Characteristics of metakaolin and its use in concrete metakaolin. Metakaolin in concrete tend to reduce the size of pores which consequently lead to obtain more strength, higher density, and more resistance to acid. An experimental study on strength properties of concrete by. Metakaolin, which is a relatively new material in concrete industry, is effective in increasing the compressive strength. The mix proportions are calculated based on the is 10262 10 and sp 23 11. Metakaolin is a valuable admixture for concrete andor cement applications. Impact of metakaolin a new supplementary material on the.
The study investigated concrete durability properties. Mechanical properties for cement replacement by metakaolin. By using this mineral admixtures with opc cement, different five types of cement were prepared and same were used to find compressive strength of concrete cubes at 3,7,14,28 and 56 days. Khatib and others published metakaolin find, read and cite all the research you need on researchgate. The csh gel that is made in the following reaction see 2 and 3 is responsible for the strength growth in cementbased concrete 36.
Grain size of metakaolin is between cement and microsilica, and. Characteristics of metakaolin and its use in concrete. Effect of metakaolin content on the properties of high strength. This paper presents experimental studies conducted on hpc mix of m60 grade using mineral and chemical admixtures in various proportions.
The particle size of metakaolin is smaller than cement particles, but not as fine as silica fume. Considered to have twice the reactivity of most other pozzolans, metakaolin is a valuable admixture for concrete cement applications. The study was carried out using target mean strength of grade 25 nmm2. Mixing, casting and curing all the materials are mixed in pan mixer. Effect of metakaolin on the properties of concrete irjet. Seven concretes were cast at a waterbinder ratio of 0.
It is comparable to silica fume in pozzolanic reactivity, but is lower in price. The used engine oil was obtained from car workshop at farin gada, plateau state nigeria. Numerous research efforts on metakaolin as a supplementary cementitious material scm have been undertaken in the past 20 years. Manufacture of cement results in a lot of ecological pollution as it involves. Metakaolin can be used as a concrete constituent, replacing part of the cement content, since it has pozzolanic properties.
The mk proportion was varied from 0 to 15% with an increment of 5% and ages of concrete from 3 to 90 days were considered andexperiments performed accordinglyincorporating metakaolin mk as mineral admixture in concrete. Metakaolin is a mineral material of aluminosilicate. Through a proprietary calcining process, powerpozz hrm is specifically manufactured to optimize pozzalanic reactivity and to exceed industry standards. Mk and gp were used as cement replacement in concrete production. Metakaolin, produced by controlled thermal treatment of kaolin, can be used as a concrete constituent, since it has pozzolanic properties. However, industry remains tentative in considering metakaolin in concrete. To rectify this major problem,methylcellulosemc will be used to increases the strength of the concrete specimen. It is a highly efficient pozzolana and react rapidly with the excess calcium hydroxide resulting from opc hydration by a pozzolanic reaction, to produce calcium silicate hydrate and calcium alum inosilicate. An experimental study on mechanical properties of paver. Understanding the benefits of high reactivity metakaolin extraordinary performance in concrete, mortar and grout sharad mathur, ph. The water used was potable, colourless and odourless that is free from organic impurities of any type. They found that, the addition of 5% optimized polymer and 15% cement replacement using metakaolin generates an optimized concrete mixture for both strength and durability.
Usually 8% 20% by weight of portland cement replaced by metakaolin. Replacing portland cement with 820% by weight metakaolin produces a concrete mix that exhibits favorable engineering properties, including. Metakaolin is used while constructing dams, bridges and water retaining structures, offshore structure etc. The worldwide manufacture of cement has deeply increased since 1990. Metakaolin can be used as a concrete constituent, replacing part of the cement. Metakaolin densities and reduces the thickness of the interfacial zone, thus improving the adhesion between the hardened cement paste and particulars of sand or aggregate. Pdf use of metakaolin as supplementary cementitious. In todays world concrete is probably the most extensively used construction material in the world. Metakaolin is one of the byproduct used in the geopolymer concrete. When used in concrete, metakaolin undergoes a pozzolanic reaction and refines the microstructure of the hydrated cement. Metakaolin which is obtained by the calcinations of pure or refined kaolinitic clay at a temperature of between 6500c and 8500c, followed by grinding to achieve a fineness of 700900 kg exhibits high pozzolanity. Study on metakaolin and fly ash based geopolymer concrete. Therefore, alkali activated metakaolin based geopolymers may also have potential application prospects in concrete surface protection 19,20. Moreover, the consistency and workability of concrete is also.
Effect of metakaolin and fly ash on properties of self. However, similar dosage rates of metakaolin equal or outperform silica fumes contribution to concrete strength. The pozzolanic reaction starts soon and continues between 7 to 28 days. In recent years, there has been a growing interest in the use of supplementary cementitious materials and polymers to produce highperformance concrete. In this content metakaolin was a pozzolanic mater ial used in wide range in partial replacement of cement in concrete which was treated as economical and also due to its pozzolanic action increases strength and durability properties of concrete. This paper shows the results of a study on the effect of metakaolin and polymer admixture on mechanical behaviour and durability properties such as permeability. Strength and duriabilty properties of concrete with. In addition, a commercial metakaolin of high purity was used. The use of cement supplementary materials in structural concrete is now widely accepted by the construction industry for technical, economical. Geopolymer concrete using metakaolin, flyash and their.
Slurry of metakaolin combined with limestone addition for. Metakaolin when used as a partial replacement substance for cement in concrete, it reacts with caoh 2 one of the byproducts of hydration reaction and results in additional csh gel leading to increase in various strength properties of concrete. The durability of concrete with metakaolin was also assessed by sulphate resistance and rapid. Water permeability, absorption was much improved in use of metakaolin which leads to increase in density of concrete. Powerpozz hrm will also enhance the concrete rheology, providing a smoother, creamier mix that improves the handling and finishing characteristics of the concrete.
The use of mc as an admixture in cement paste or concrete was found to increases the bond strength between the concrete and reinforcement. The inclusion of metakaolin increased the compressive and flexural strength. It is obtained by calcination of kaolinitic clay at a temperature between 500c and 800c. Study the in uence of metakaolin and foundry sand on self. An experimental study on strength properties of concrete. It is also used in high rise buildings to achieve high strength concrete. In this content metakaolin was a pozzolanic material used in wide range in partial replacement of cement in concrete which was treated as economical and also. Metakaolin complies with astm c618 specifications for coal fly ash and raw or calcined natural pozzolan for use as a mineral admixture in concrete, class n, and is accepted under. Below is information about what metakaolin is, how it works, and how to use it in concrete countertop mixes. It is produced by controlled thermal treatment of kaolin. An experimental program was designed to produce a high strength concrete by adding several combinations of mk.
The optimum dosage of metakaolin, as a partial cement replacement is 15 to 20% for the used fineness in this study at wcm ratio 0. In this current paper, metakaolin is used as admixture to produce high strength concrete. Aesthetic effects of metakaolin hrm can be used in integrally colored concrete to lighten and intensify its color hrm is used in white portland cement concrete without compromising brilliance mixed into ordinary gray portland cement, hrm gives the concrete a lighter value that can create new aesthetic opportunities 312017 17. It is used in the manufacturing of high strength, high performance and lightweight concrete. However, the production of portland cement releases significant amount of co2 carbon dioxide, a.
The influence of metakaolin addition on durability will. To study the different mechanical properties of geopolymer concrete with varying percentages of ggbs and metakaolin. Previously, researchers have shown a lot of interest in mk as it has been found topossess both pozzolanic and micro. Metakaolin used in concrete blends fills the void space between the cement particles to produce a more impermeable concrete structure. Strength properties of concrete specimens with metakaolin.
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