International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
An Experimental Investigation on Partial Replacement of Cement with Metakaolin and Fine Aggregate with Robo Sand O.Hemanth Rama Raju1, P.Sravani Ramya Singam 2 1Post 2Asst.
Graduate student, Gudlavalleru Engineering College, Gudlavalleru, India
Professor, Dept. of Civil Engineering,, Gudlavalleru Engineering College, Gudlavalleru, India
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Concrete is a compound material made from cement, water, fine aggregate and coarse aggregate. But present researchers are in significance of finding new concrete by using different alternative materials or products produced from industries which are harmful to atmosphere. An attempt has been made in the present investigation to evaluate the compressive strength and split tensile strength and flexural strength properties by replacing cement partially with metakaolin and by using Robo Sand instead of river sand by variable percentages. In this project, experimental study was carried out on M-35 grade of concrete. In this concrete mixes sand was replaced by Robo sand in various percentages such as 10%, 20%, 30% 40%, 50%, 75%, 100% and cement was replaced by metakaolin in various percentages such as 5%, 10%, 15% and 20%.The results thus obtained were compared and examined with respect to the control sample. From the test outcomes, it was found that 15% of the Ordinary Portland cement could be beneficially replaced with the metakaolin to improve compressive, split tensile and flexural strengths of concrete. For strength parameters for each grade of concrete Cubes, Cylinders and beams are tested at the age of 7 and 28 days. Key Words: Robo Sand, Metakaolin, Compressive strength, Split tensile strength, Flexural strength. 1. INTRODUCTION Concrete is perhaps the most extensively used construction material in the world. With the advancement of technology and greater than before field of application of concrete and mortars, the strength, workability, durability and other characteristics of the ordinary concrete can be made suitable for any situation. For this, definite magnitude of cement, water, fine aggregate, coarse aggregate, mineral admixtures and chemical admixtures are required. The demand for Portland cement is increasing significantly in developing countries. Portland cement production is one of the major reasons for CO2 emissions into environment. Metakaolin when used as a partial replacement substance for cement in concrete, it reacts with Ca(OH)2 one of the by-products of hydration response of cement and results in additional C-S-H gel which results in increased strength. Metakaolin is obtained by thermal commencement of kaolin clay. This creation will cause a substantial loss of water in its constitution causing a reorganization of its structure. For © 2017, IRJET
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obtaining adequate thermal activation, the temperature range should be in between 600 to 750ºC. The principle reasons for the use of clay-based pozzolans in mortar and concrete have been due to availability of materials and durability enrichment. Accumulation depends on the calcining temperature and clay type. It is also possible to obtain improvement in strength, particularly during the strength of curing. The very early strength enrichment is due to a combination of the filler effect and acceleration of cement hydration. 2. MATERIAL STUDY 2.1 MATERIALS 2.1.1 CEMENT: The physical properties of the cement used in present investigation i.e. Ordinary Portland cement of 53 grade (KCP cement) confirming to IS 8112: 2013. 2.1.2 FINE AGGREGTE: Locally available river sand of size less than 4.75 mm was used. The specific gravity of fine aggregate is 2.64, Fineness modulus is 3.2 and Grading Confirming to Zone-II. (Specifications as per IS 383:1970). 2.1.3 COARSE AGGREGATE: The material whose particles are of size as are retained on IS. Sieve 4.75 mm is termed as coarse aggregate. The size of coarse aggregate depends upon the nature of work. The Coarse aggregate used in this experimental investigation is 20 mm size, crushed and angular in shape. Specific gravity of coarse aggregate for 20 mm size is 2.71. 2.1.4 WATER: Water should be easily available and it should be clear and tap water also satisfactory to mix the ingredients and it should not be any alkali and should be free from chlorides of calcium and magnesium. 2.1.4 ROBO SAND: Robo Sand is collected from “Donabanda Quarry” crushing unit. It was initially dry in stipulation when collected and was sieved by IS 4.75 mm. It has shape of particles as Cubical Particle. The specific gravity of Robo Sand is 2.68, Fineness modulus is 3.34. Grading Confirming to Zone-II. 2.1.5 METAKAOLIN: Metakaolin is brought from Astro chemicals, Chennai. Specific gravity of metakaolin 2.5 is used in replacement of cement. Metakaolin is a chemical phase that forms upon thermal treatment of kaolinite. Kaolinite’s chemical composition is Al2O3:2SiO2. 2H2O and as a result of ISO 9001:2008 Certified Journal
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