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The IUP Journal of Structural Engineering :
A Study on the Properties of Concrete with Coconut Fiber, Steel Fiber and Polypropylene Fiber
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The paper describes the enhancement in the strength of the conventional concrete by the addition of fibers. Coconut fibers, steel fibers and polypropylene fibers were used in the study. For all fibers, at optimum values, compressive strength increased for coconut fiber 5.5% and 7.2%, for steel fiber 2.5% and 9.5%, and for polypropylene fiber 4% and 6%. Split tensile strength increased for coconut fiber by 11.5% and 13.6%, for steel fiber 15% and 17.5% and polypropylene fiber 10% and 11%. Flexural strength increased for coconut fiber by 15.8% and 17%, for steel fiber 19% and 23%, and for polypropylene fiber 14% and 15.5% for M30 and M60 grades of concretes respectively. Durability tests like acid attack and alkaline attack were conducted on concrete with and without fibers. The results indicated a loss in all the strength parameters in varying percentages.

 
 

Concrete is the most widely used construction material all over the world. With innovations in science and technology in construction industry, the importance of concrete as a structural material has widened. Basically, concrete is weak in tension and flexure to overcome this failure and requires a reinforcing material such as steel bars. However, the usage of steel reinforcement is expensive these days. Considerable efforts have been made worldwide to add various types of fibers to concrete so as to make it more strong, durable and economical. Fibers such as coconut fiber, steel fiber and polypropylene fiber have certain physical and mechanical characteristics that can be utilized effectively in the development of reinforced concrete material. The primary goal of this paper is to conduct experimental studies for enhancement of properties of concrete by reinforcing it with coconut fiber, steel fiber and polypropylene fiber.

 
 

Coconut fiber, Steel fiber, Polypropylene fiber, Silica fume, Acid water curing, Alkaline water curing, Durability factor, Superplasticizer, Compressive strength, Split tensile strength, Flexural strength