Considered to have twice the reactivity of most other pozzolans, metakaolin is a valuable admixture for concretecement applications. In this thesis paper, studies on partial replacement of cement with metakaolin as different percentage in m30 mix. Replacement level of pc will depend on the nature of the constituents and the to and reaction time. In this study an attempt is made to design a m70 grade hpc mix with metakaolin.
The optimum percentage for replacement of cement with metakaolin and marble powder was 9% and 10 % respectively for both cubes and cylinders. Pdf strength properties of metakaolin admixed concrete. Effect of metakaolin content on the properties of high. Metamax hrm reduces concretes vulnerability to chemical attack by densifying concrete and lowering its lime content. In this study dealing with concrete incorporating flyash and metakaolin and fibre replacing ordinary portland cement in concrete with various percentages of flyash and constant percentage of metakaolin. Powerpozz hrm an amorphous aluminosilicate, is white in color and is a proven alternative to silica fume. The dosages of metakaolin were 0 %,10% and 20% of the cementations materials. Strength and duriabilty properties of concrete with. Water permeability, absorption was much improved in use of metakaolin. The result obtained from the test is compared with normal specimens without replacement. Effects on compressive strengths of mortars and economics presented by.
Concrete is the most commonly used material for construction. Supplementary cementitious materials scms have been widely used all over the world in concrete due to their economic and environmental benefits. About ecosmart the objective of the ecosmart concrete project ecosmart is to minimize the ghg signature of concrete by maximizing the replacement of portland cement in the concrete mixtures with scms while maintaining or improving cost, performance, and. Partial replacement of cement with metakaolin in high. This quality also improves pumpability and can be used to impart detailed surface textures to cast surfaces6. Advanced cement technologies metakaolin and silica fume. Geopolymer concrete depending on metakaolin and the recycled concrete aggregate can be used as lightweight concrete, with density less than 1905 kgm3 with acceptable resistance.
The maximum sulfate expansion values after 18 month of sulfate exposure and compressive strength reduction of mk concrete decreased with decreasing the wb ratio. Metakaolin geopolymer composite is composed of flyash and this investigation is from ennore thermal power station, chennai, india and metakaolin is procured under the brand name metacem from 20 microns, mumbai. Metakaolin is a valuable admixture for concrete andor cement applications. Tests were conducted to study the strength of hardened concrete such as compressive strength, flexural strength, split tensile strength. Metakaolin in concrete tend to reduce the size of pores which consequently lead to obtain more strength, higher density, and more resistance to acid.
Thus, it decreases permeability and increase durability of the concrete. Metacem 85c high reactivity metakaolin hrm is a scientifically processed reactive allumino silicate pozzolan formed by calcining purified clay in an externally fired rotary kiln. 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. Metakaolin is commonly used in the production of ceramics, but is also used as cement replacement in concrete. This study investigates the coupled substitution of metakaolin and limestone in portland cement pc. The present study aims to evaluate the mechanical and. Mk mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 mpa and 100 25 mm. Study on metakaolin and fly ash based geopolymer concrete. Strength properties of concrete specimens with metakaolin. The consumption of cement is also very high to meet the requirements.
Concrete mixes with different percentages of metakaolin as a cement replacement material were investigated. The mechanical properties were studied in mortars and the microstructural development in pastes by xray diffraction, thermogravimetry analysis, mercury intrusion porosimetry and isothermal calorimetry. Concrete is the extensively used construction material in the world. For high strength concrete silica fumemicro silica is used. Effects of metakaolin and silica fume on properties of concrete article pdf available in aci materials journal 994. Concrete is a basic material for the construction industry. Due to infrastructure development in the developing countries, consumption of concrete is very high. The interest of use of metakaolin in cement mortar and concrete is of high. Cement substitution by a combination of metakaolin and.
The replacement levels were 10%, 15%, 20%, 25%, upto 30% by weight for metakaolin. Concrete with metakaolin can be placed, finished and cured in pretty much the same manner as concrete without hrm. The compressive flexural and tensile strength of concrete obtained at 7 and 28days. From elegant interior concrete fixtures, to large high performance concrete infrastructure projects, powerpozz hrm has exceeded the design and performance criteria demanded by architects.
The admixture metakaolin when used at optimum quantity tend to increase the strength of concrete mix when compared with conventional concrete. Performance concrete using high reactivity metakaolin, the indian concrete journal, may 2003, 10771085. The study on bagasse ash with geopolymer concrete is done to check the best percentage replacement of bagasse ash bagasse ash is a mineral admixture which has been produced as a waste material from the sugarcane industry. Similarly for 15% and 20% of addition of metakaolin the compressive strength is increased by 11.
The worldwide production of cement has greatly increased since 1990. Given the small amount of concrete involved in countertops, a 40pound bag is enough to provide countertops for two or three average kitchens, so the material cost is. Concrete is the high volume of fly ash and metakaolin as a partial replacement of ordinary portland cement. Pdf effects of metakaolin and silica fume on properties. The conventional concrete m60 was made using opc 53 with metakaolin and fly ash. Metakaolin increased the compressive strength, split tensile strength and flexural strength of concrete. Using metakaolin in decorative concrete mixes concrete. Jeffrey girard, president of the concrete countertop institute, raleigh, n.
Furthermore, metakaolin improves concrete resistance to alkali silicate reactions and sulfate attack. Because metakaolin consumes calcium hydroxide, it takes away the alkali and the reaction does not occur. However, environmental concerns both in terms of damage caused by the extraction of raw material and co2 emission during cement manufacture have brought pressure to reduce cement. Metakaolin concrete tends to exhibit a creamy texture, resulting in better finishes7 compared to other finely divided standard concrete mixes. Durability of metakaolin concrete to sulfate attack pdf. To study the effect of the metakaolin in the concrete, several compositions were prepared. It complies with astm c 618 specification for coal fly ash and raw or calcined natural pozzolan for use as a mineral admixture in concrete, class n and is accepted under aci 318 building code requirements for structural. Replacing portland cement with 820% by weight metakaolin produces a concrete mix that exhibits favorable engineering properties, including. This clearly shows the optimum percentage of metakaolin used in the concrete is 10%. Use of metakaolin in high strength concrete the use of metakaolin becomes ample ingradients in the production of concrete of more than 40mpa or where service environments, exposure conditions or life cycle cost considerations dictate the use of high performance concrete. Metakaolin consist of silica and alumina in an active form and as other mineral admixtures, it reacts with the calcium hydroxide at room temperature and form calcium silicate hydrate cshgel which increases the density of concrete and reduces porosity. Produces significant pore refinement modifies water transport properties and diffusion rates of harmful ions. Production of cement results in a lot of environmental pollution as it involves the emission of co 2 gas. Raleigh, nc 27607 the concrete countertop institute you complete resource for concrete countertop success.
Cements with additions such as limestone, slag and natural pouzzolana are produced in cement factories in algeria. Metakaolin, which is a relatively new material in concrete industry, is effective in increasing the compressive strength. To evaluate optimize ratio and mechanical properties of metakaolin based on concrete and compare with conventional mix. Experimental investigation on the strength properties of. Kaolin products making concrete stronger, brighter and. From the results, it was observed that 10 % replacement level was the optimum level in terms.
The use of additions in cement in manufacturing, mortar and concrete offers economic and ecological advantages. The heat of geopolymerization process is always less than the heat of hydration of portland cement. Several studies analyzed the effect of these additions on the physical and mechanical properties as well as the durability of concrete. Metakaolin is clay mineral product and it shows higher strength properties in concrete 12.
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