Volume No. 2 Issue No.: 2 Page No.: 180-187 October-December 200

 

MECHANICAL PROPERTIES OF FIBER REINFORCED CONCRETES PRODUCED FROM BUILDING DEMOLISHED WASTE

 

M.L.V. Prasad* and P. Rathish Kumar

Department of Civil Engineering, National Institute of Technology, Warangal, (India)

 

Received on : July 4, 2007

 

ABSTRACT

 

In virtually every field of industry, studies are being conducted to find ways and means to decrease burden on the environment as well as to make effective use of our limited natural resources. Preservation of the environment and conservation of the rapidly diminishing natural resources should be the essence of sustainable development. The enormous amounts of demolished concrete produced from deteriorated and obsolete structures create severe ecological and environmental problems. One of the ways to solve this problem is to use this Building Demolished Waste (BDW) concrete as aggregates. The brittleness of concrete can be overcome by spreading fibers discretely in concrete. In the present work, Fiber Reinforced Recycled Aggregate Concrete (FRRAC) was developed independently using two different types of fibers namely Glass Fiber and Polypropylene Fiber having individual applications. The mechanical properties were evaluated for a grade of concrete (M20), for different replacements of Recycled Concrete Aggregate (RCA) in Natural Aggregate (NA). It was observed that there was 15-17 % increase in split tensile strength and about 14 % improvement in flexural strength with addition of fibers in recycled aggregate concrete. The values obtained were also compared with the Indian Standard Codal Provisions. The increased energy absorption capacity in FRRAC indicates higher toughness and better post elastic deformations in the event of seismic actions.

 

Keywords : Building Demolished waste (BDW), Fiber Reinforced Recycled Aggregate concrete (FRRAC), Sustainability, Fiexural strength, Mechanical properties

 

 

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