International Journal of Research e-ISSN: 2348-6848 p-ISSN: 2348-795X Available at https://edupediapublications.org/journals Volume 05 Issue 12 April 2018

A Study on Mechanical Properties of High Strength Metacem Admixtured Kondisetty Ravi Kiran & B.Ajitha 1M. Tech ( structural Engineering), Department of Civil Engineering, JNTUA College of Engineering , Ananthapuramu. 515002, India.

2 Assistant Professor of Civil Engineering , JNTUA College of Engineering , Ananthapuramu. 515002, India.

ABSTRACT manufacture have brought about pressures

The infrastructure development is an to reduce consumption through the important aspect for the overall use of supplementary materials. It reduces development of country. India is developing the cost, makes concrete more durable and it as a major hub for service industry, is eco-friendly. Concrete is probably the automobile industry and for which the most extensively used Construction material infrastructure development plays an in the world. The addition of mineral important role. In case of infrastructure admixture in cement has dramatically development construction of bridges, increased along with the development of aqueducts, high rise buildings, off shore concrete industry, due to the consideration structures, nuclear power stations, dams, of cost saving, environmental protection and and high strength concrete above M55 is conservation of resources. However, commonly adopted. The necessity of high environmental concerns both in terms of strength concrete is increasing because of damage caused by the extraction of raw demands in the construction industry. In all material and carbon dioxide emission construction works, concrete is an important during cement manufacture have brought and costly issue, which governs the total pressure to reduce cement consumption by cost of the project. Concrete can generally the use of supplementary materials. be produced of locally available Mineral admixtures such as , constituents. , , etc., are more

However environmental concerns, stemming commonly used in the development of HSC from the high energy expense and Co2 mixes. Addition of such materials indicated emission associated with cement the improvement in the strength and

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durability . The After finalizing the basic mix, five mix utilization of calcined , in the form of proportions were designed with metacem- High Reactivity metakolin (HRM) in 85C quantities varied from 0 to 20% weignt concrete has received considerable attention of cementitious materials. in recent years. Each mix 9 150mmX150mmX600mm were The mix design developed for high strength casted then kept in curing tank. After 3days, concrete, a partial replacement of cement 7days, 28 days of curing the specimens were with metakaolin a comparison is shown. The tested flexural strength is also found out. use of High strength concrete allows for the The appropriate mix proportions were construction of modern-day, high-rise obtained. For M60 grade of concrete, the buildings concrete is a cementitius material is replaced with composed of bonded together Metacem-85C in the proportion of 0%, 5%, with a fluid cement which hardens over time. 10%, 15%, 20% (by volume) in all mixes. In Concrete is the essential material that is the present investigation, cement is partially used in the major construction work. It replaced with metacem-85C of various involves the process of determining proportions in concrete. Results of this study experimentally the most suitable concrete showed that metakaolin is very effective in mixes in order to achieve the targeted mean improvement of mechanical properties of strength. In this work 53 Grade Ordinary concrete. , the locally available river KEY WORDS: High strength concrete, , 16mm grade with 60% and 10mm Metacem-85C, Admixtures, Flexural grade with 40% by volume coarse aggregate strength, were selected based on ASTM C 127 standard for determining the relative 1. INTRODUCTION quantities and proportions for the grade of Concrete is most important part in the concrete M60. In the present work, few structural construction. High strength mixes were designed and ultimately one best concrete is used more widely with each mix was treated as basic mix and water to passing year. It is important to remember cement ratio was fixed to 0.32. several things about High strength concrete.

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Initially, it is just one many mixes that have been adjusted to It has been observed that the replacement of deliver a specific property or properties. In metakaolin can be used in structural purpose this case, it is compressive strength. The in civil engineering. Based on revie of same understanding which made it possible literature is clear that among many mineral to develop High strength concrete is also admixtures available, Metakaolon (MK) is a applied when developing concrete mixes mineral admixture, whose potential is not with high flexural strengths, High durability yet fully tested and only limites studies have benefits, high skid resistance, high abrasion been carried out in india on the use of MK resistance, and super-flat characteristics. In for the development of High Strength other words, High strength concrete is just Concrete. one type of high-performance concrete. OBJECTIVES OF THE STUDY: Secondarily, High strength concrete is not a 1. To know the fresh and hard stage large part of the production output of any properties of concrete of High Strength ready mix plant. However, the ability to Concrete produce this type of concrete without 2. To know the flexural behavior of difficulty requires a higher level of concrete of HSC sophistication and skill than is considered 3. To know the modes of failure under necessary for more conventional 3000-psi flexural load. and 4000-psi concrete mixes. Replacement 4. To know the compressive strength of of cement by Metacem-85C increases the concrete of HSC strength of the concrete and enhances the 5. To know the workability of HSC. durability of the concrete. The reasons for SCOPE OF PRESENT WORK: this interesting property may be matakaolin According to the codal procedures, we have is highly efficient pozzolana and reacts to perform the tests to know the fresh and rapidly with the excess calcium silicate hardened properties of High strength hydrates and calcium aluminosilicate concrete made with metacem-85C hydrates. The particles of metakaolin are replacement. The experimental work was smaller than the cement grains. Mean grain conducted on cubes, cylinders, beams so that size is approximately 2.54µm.

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it leads to evaluate the compression and reductions of up to 30% were achieved with flexural strengths of concrete the use of this super plasticizer called mightly 150. This admixture was introduced 2. LITERATURE REVIEW into the Japanese concrete industry as a Niva john (2013) investigated the cement nominal name of “high-range water- replacement levels were 5%,10%,15%,20% reducing admixture” by weight of metakaolin. The strength of all ErhanGuneyisi (2007) reported that the metakaolin admixed concrete mixes over inclusion of metakaolin as a supplementary shoot the strength development of concrete. cementitous material in concrete helps in a Mix with 1% metakaolin is superior to all wonderful way to reduce drying shrinkage other mixes. The increase in metakaolin strain. The pore structure of concrete was content improves the compressive strength, greatly enhanced due to the utilization of flexural strength, split tensile strength up to ultrafine metakaolin which was also 15% replacement. The result encourages the accompanied by the decrease in the harmful use of metakaolin, as pozzolanic material for large pores thereby improving the overall partial replacement in producing high permeability of concrete. strength concrete. The inclusion of metakaolin results in faster early age The imperviousness was greatly seen at 20% strength development of concrete. The replacement level. The studies also revealed utilization of supplementary cementitious that the strength was dependent on the levels material like metakaolin concrete can of replacement, water cement ratio and age compensate for environmental, technical and of testing and also the strength enhancement economic issues caused by cement was in varying magnitudes. production. 3. MATERIALS USED Dr. Hattori developed formaldehyde The materials used for this experimental condensates of beta-naphthalene sulfonates work are cement, sand, water, Metakaoline, with the primary aim of significantly and super plasticizer. reducing the water demand of concrete to A. Cement: produce high strength concrete. Water

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Ordinary Portland cement of grade 53 AAC recycled concrete and geo-artificial Cement was used in this experimental work aggregates. Aggregates are the most mined the properties of cement are tabulated as materials within the world. follows: Coarse aggregate:

Crushed stone mixture of 20mm size is added from nearby . Aggregates of length greater than 20mm size are separated by using sieving. Tests are carried which will find out the

• Specific gravity = 2.98 A sample of cement • Fineness modulus = 7.5 Cement is a fine grey powder. It is mixed with water and materials such as sand and to make concrete. The cement was of uniform colour and was free from any hard lumps. Properties of this cement had been tested Coarse aggregates and listed below. Fine aggregate: 1. Fineness of cement = 5% Locally available sparkling sand, 2. Specific gravity if cement = 3.02 unfastened from natural count number is 3. Standard Consistency of cement = 33% used. The result of sieve evaluation confirms 4. Initial placing time = 50mins it to Zone-II (in step with IS: 383-1970).The 5. Final putting time = Not extra than 10 tests are carried out and results are shown hours. below. B. AGGREGATES: • Specific gravity = 2.3 Construction aggregate, or absolutely • Fineness modulus = 3.06 "aggregate", is a huge class of coarse particulate fabric used in production, including sand, gravel, beaten stone, ,

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A. Appearance of Metacem-85C

Fine aggregates Mix proportion for M60 grade concrete is 1:1.34:2.54 at w/c 0.32 C. Metakaolin 4. RESULTS AND ANALYSIS Metakaolin is a dehydroxylated form of the clay mineral kaolinite. Stone that are WORKABILITY OF HPC (Fresh concrete wealthy in kaolinite are known as china clay tests) or kaolin, historically used inside the 1. SLUMP CONE TEST manufacture of porcelain. The particle size of metakaolin is smaller than cement particles, however not as best as silica fume.

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2. COMPACTION FACTOR TEST

FLEXURAL STRENGTH OF CONCRETE (Hardened Concrete test)

A. Variation of Flexural strength of beam at 0% replacement of Metakaolin

B. Variation of Flexural strength of beam at 3. VEE-BEE TEST 5% replacement of Metakaolin

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C. Variation of Flexural strength of beam at 10% replacement of Metakaolin 5. CONCLUSIONS

From the present investigation on the effect of partial replacement of cement with metakaolin in concrete, the following conclusions were drawn.

1. The flexural strength of HSC has increased for 5% and 10% replacement of metakaolin and decreases in 15% and 20% replacements. 2. Success of HSC requires more attention D. Variation of Flexural strength of beam at on proper mix design, production, 15% replacement of Metakaolin placing and curing of concrete. For each of these operations controlling parameters should be achieved by concrete producer for an environmental that a structure has to face. 3. Even through the initial cost of HSC is comparatively higher than conventional concrete, considering the long service life of the structures and minimum maintenance required, the benefit cost ratio is very much in favor. 4. The HSC permits use of reduced sizes of structural members and increases E. Variation of Flexural strength of beam at 20% replacement of Metakaolin available usable space in building, which is an important factor in congested urban locations. 5. HSC can be advantageously used for the production of precast products which can be mass produced and which utilize effectively the high durability and strength characteristics such as electric poles in coastal areas, pipes for transportation of corrosive liquids such as sewage, effluents.

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