International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249-8958 (Online), Volume-9 Issue-2, December, 2019 4694 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: B5130129219/2019©BEIESP DOI: 10.35940/ijeat.B5130.129219 Journal Website: www.ijeat.org Abstract---Recycled aggregates (RCA) are the aggregates which are made up of crushed, inorganic particles that are obtained from the construction demolition debris. Now a day’s protection of environment is the ultimate challenge to the society. So the usage of RCA’s is the best alternative for the aggregates which are obtained naturally in the construction activity. The scope of using these recycled concrete aggregates is increasing day by day. It reduces the cost effectively as we are using waste concrete as recycled aggregates. The main focus of this paper is to use find the strength qualities of recycled aggregates so as to use it as an alternative for the natural aggregates in high strength concrete for various construction activities. Comparison of workability, compressive strength, tensile strength, elastic modulus and flexural strength of recycled aggregate concrete is made with natural aggregate concrete. Here M25 grade concrete is taken and the natural aggregates were replaced with recycled aggregates in various percentages of 0%, 25%, 50%, 75% and 100%. The mix design for these replacement ratios are done by using code of IS 10262-2009. In order to determine the properties which were mentioned above a total of 60 cubes, 10 beams and 40 cylinders were casted. The compressive strength and tensile strength of RCA concrete have been determined for 7 days and 28 days where as the modulus of elasticity and the flexural strength of RCA concrete are determined after curing for the period of 28 days. The tests done on RCA concrete are compared with concrete which is obtained by natural aggregates As per IS codification the parameters which were determined are reducing moderately as the amount of aggregates which are recycled is being raised. Key words: Elastic Modulus, Tensile strength, compression strength, Recycled aggregates. I. INTRODUCTION Concrete, composite construction material made up of cement, sand (fine aggregate), gravel (coarse aggregate) and water. For over a century the concrete has been using as a leading construction material. It has been reckoned that the concrete production is approximately 2.5 tones i.e.; 1 m 3 per capita. After 2025 the overall world wide usage of naturally obtained aggregates will be around 10-13 billion tones. Revised Manuscript Received on December 30, 2019. * Correspondence Author S.Manasa, Civil Engineering, Malla Reddy Institute of Technology, Hyderabad, Telangana, India.(Email: [email protected]) M.Uday Bhaskar, Civil Engineering, Malla Reddy Institute of Technology, Hyderabad, Telangana, India. (Email: [email protected]) G.Naveen Kumar, Civil Engineering, Malla Reddy Institute of Technology, Hyderabad, Telangana, India (Email: [email protected]) © The Authors. Published by Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) At the same time the construction and demolition wastes are increasing significantly worldwide every year. More usage of aggregates which are obtained naturally and the increased amounts of construction and demolished wastes causing severe environmental problems and diminishing the people and the ecologist’s desire for a society which is pollution free. Fig.1. Recycled aggregates Formerly, almost all the materials which are being utilized in the construction activity are obtained naturally and all the wastes which are obtained from the demolished buildings were disposed in large unauthorized open places. Over two decades the usage of RCA’s which are acquired from demolition wastes of construction activity is having a greater importance as the availability of natural aggregates is reducing drastically year by year and the damage caused by the disposal waste is increasing. Due to advance techniques which are being used in the crushing industry and advancement in the equipment & recycling process, it became very easy to pulverise demolish waste larger boulders in to tiny pieces in order to produce recycled aggregates at reasonable cost. Now a days the quality of recycled aggregates has been drastically increased because of good demolition practices and advancement in the crushing machinery. As a result of this the recycled aggregates of best quality are available at the rates equal to that of natural aggregates and giving a tough completion to the natural aggregates. Though these aggregates are available at reasonable rates, the usage is limited because of using low strength cement and poor quality aggregates and also the limitations of the standards. So by using latest technologies in concrete technology and material production the negative impact on the recycled aggregates have to be removed and usage of RCA’s has to be increased in construction activity. a. Need for the PresentWork: Concrete is widely utilized material in the construction activity because of its easy availability of the cement, sand, gravel and water and also handled easily with low service maintenance. Performance of Recycled Aggregate Concrete for M 25 Grade Concrete S. Manasa, M. UdayBhaskar, G. Naveen Kumar
Performance of Recycled Aggregate Concrete for M25 Grade Concrete
May 22, 2023
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