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
Experimental Investigation on Concrete by Replacing Natural Coarse Aggregate Partially with Recycled Coarse Aggregate (RCA) & Addition of Natural Coir Fibres Salahuddin Shakeeb S M1, Sd Farhanuddin2, Shaik Adnan Sameer3, Mohd Irfanullah Khan 4 1
Assistant Professor, Department of Civil Engineering, NSAKCET, Hyderabad, Telangana, India 2BTECH Student, Department of Civil Engineering, NSAKCET, Hyderabad, Telangana, India 3 BTECH Student, Department of Civil Engineering, NSAKCET, Hyderabad, Telangana, India 4 BTECH Student, Department of Civil Engineering, NSAKCET, Hyderabad, Telangana, India
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Abstract - This thesis aims to find the possibility of the
structural usage of recycled aggregate concrete in lieu or mixed with natural aggregates along with addition of natural coir fibres, based on better understanding of behavior of recycled aggregate with coir fibre in concrete structures. To identify the effects on workability and mechanical strength properties due to the addition of these recycled coarse aggregate and coir fibres, workability tests such as slump test, and the mechanical strength tests on standard specimens such as compressive strength and split tensile strength were conducted on the different ratios. The standard cubes and cylinders for conventional concrete were prepared and tested under compressive and tensile loads. Based on the experimental results of workability and mechanical strength studies, a constant length of 50 mm of coir fibre and diameter 0.34, 1% by weight of cement were used along with varying percentages of recycled coarse aggregate as 0%. 10%, 20%, 30%, 40%. It is found that by replacing 20 % natural aggregate by recycled aggregate, the compressive strength and tensile strength yielded best results. It has been noticed that a increase of 24% and 8% of compressive strength and tensile strength has been noticed respectively. Key Words: RCA, Coir Fibres, Compressive Strength, Split Tensile Strength‌ 1. INTRODUCTION One of the major challenges of the present society is the protection of environment. Some of the important elements in this respect are the reduction in the consumption of energy, natural materials and extensive use of waste materials. Nowadays these are getting considerable attention under sustainable development. In addition to the environmental benefits in reducing the demand of land for disposing the waste, the recycling of demolition wastes can also help to conserve the natural resources.
1.1 RCA (Recycled Concrete Aggregate)
In India, a huge quantity of construction and demolition wastes is produced every year. India is presently generating construction and demolition waste Š 2017, IRJET
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Impact Factor value: 5.181
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of 23.75 million tons annually and these figures are likely to double in the next 7 years. . And the continuous use of natural resources for making conventional concrete leads to the reduction in their availability and results in the increase of the cost of the coarse aggregate and fine aggregate. The possible use of recycling demolition waste as coarse aggregate in the construction industry is thus increasing importance. When recycled coarse aggregate is used in structural concrete, the assessment of physical, mechanical and durable characteristics of recycled coarse aggregate is very important. The physical and mechanical properties of concrete with the recycled coarse aggregate (RCA) are to be evaluated to assess its application as structural concrete. Properties of the recycled concrete aggregates depend on the source, quality of the waste material, percentage ratio of components and also on the sievefraction of aggregate.
1.2 Coir Fibres Coconut fibre is a natural fibre extracted from the husk of coconut. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut. Brown coir harvested from fully ripened coconuts is thick, strong and has high abrasion resistance. Total world coir fibre production is 250,000 tones. India, mainly in Pollachi and the coastal region of Kerala State, produces 60% of the total world supply of coir fibre. Over 50% of the coir fibre produced annually throughout the world is consumed in the countries of origin, mainly India. Together, India and Sri Lanka produce 90% of the coir produced every year. This research is aimed at putting into effective use of recycled coarse aggregate and coir fibre in a good proportion to reduce the high cost of structural concrete. Coir fibre is an agricultural waste product, and how to dispose of it is a problem to waste managers. The most expensive concrete material is its aggregates and if such all-important expensive material is partially replaced with more natural, local and affordable material like RCA and coir fibre will not only take care of waste management but will also reduce the problem of high ISO 9001:2008 Certified Journal
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