A Study On Behaviour Of Flexural Strength Of Fibre Reinforced Concrete Members Subjected To Alternate Wetting And Drying
Praful N K
Keywords: Fibre reinforced concrete, flexural strength, alternate wetting and drying, steel fibre, glass fibre and polypropylene fibre, percentage of fibre and aspect ratio.
ABSTRACT: Concrete is most widely used construction material in the world. However, it has low tensile strength, low flexural strength, low ductility and low energy absorption. An intrinsic cause of poor tensile behaviour of concrete is its low toughness and the presence of defects. Therefore to improve its strength, toughness and ductility fibres are used in concrete. Fibre reinforced concrete is a composite material consisting of cement based matrix with an ordered or random distribution of fibres. The addition of fibres increases the properties of concrete such as flexural strength, impact strength and shrinkage strength. In this present experimental work of investigation the main objective is to study the flexural strength of concrete using different fibres with same aspect ratio for all the fibres and to study the effect of alternate wetting and drying for 30 cycles on Flexural strength of concrete using different fibres such as steel fibre, glass fibre and Polyproplyene fibre with variation of fibre percentage from 0%, 1%, 1.5% and 2% and comparing their strength with 28 days strength of concrete without alternate wetting and drying. From the experimental investigation it is clearly observed that there is very good enhancement in flexural strength for all combinations of fibres and all percentage variation of fibres.
 P.Srinivasa Rao, Chandra Mouli .K, T. Seshadri sekhar, “Durability Studies on Glass Fibre Reinforced Concrete”, Journal of civil engineering science: An international journal, Vol.1 No 1-2, Jan-2012, pp 37-42.
 Roohollah Bagherzadeh, Hamid Reza Pakravan, Abdol-Hossein Sadeghi, Masoud Latifi, Ali Akbar Merati, “An Investigation on Adding Polypropylene Fibers to Reinforced Lightweight Cement Composites (LWC)”, Journal of Engineered Fibers and Fabrics, Volume 7, Issue 4-2012.
 G.Murali, C.M.Vivek Vardhan, R.Prabu, Z.Mohammed Sadaquath Ali Khan, T.Aarif Mohamed and T.Suresh, ”Experimental Investigation On Fibre Reinforced Concrete Using Waste Materials” , IJERA, Vol.2 Issue 2, Mar-Apr 2012, pp.278-283.
 Jain D. and Kothari A.,”Hair Fibre Reinforced Con-crete”, International Science Congress Association, Research Journal of Recent Sciences, Vol. 1(ISC-2011), 128-133 (2012).
 Vinayak B. Jatale, M. N. Mangulkar , “Flexural Behavior of Self Compacting High Strength Fibre Reinforced Concrete (SCHSFRC)”, International Journal of Engineering Research and Applications (IJERA), Vol. 3,Issue, Jul-Aug 2013,pp.2503-2505.
 Amit Rana, “Some Studies on Steel Fiber Rein-forced Concrete”, International Journal of Emerging Technology and Advanced Engineering, Vol 3, Issue 1, Jan 2013.
 Ashish K Gurav, K. B. Prakash, ”A Study on the Ef-fect of Alternate Wetting and Drying on the Strength Properties of SIFCON Produced from Waste Coiled Steel Fibres” , NBMCW, DEC-2012.
 J.S. Dali and S.N. Tande,” Performance of concrete containing mineral admixtures subjected to high temperature”, 37th Conference on OUR WORLD IN CONCRETE & STRUCTURES: 29 - 31 August 2012, Singapore.
 M Sivraja, Kandasamy, N Velmani and M Sudhakaran Pillai, “Study on durability of natural fibre concrete composites using mechanical strength and microstructural properties”, Indian Academy of Sciences, Bull. Mater. Sci., Vol. 33, No. 6, December 2010, pp. 719–729.
 Shanthappa B. C., Prahallada. M. C., Prakash. K. B., ”Effect of addition of combination of Admixture on self-compacting concrete subjected to alternate wetting and drying”, International Journal of Civil Engineering and Technology (IJCIET), ISSN 0976 – 6308(Print) ISSN 0976 – 6316(Online) Volume 2, January - April (2011), pp. 17-24.
 Vasudev R, B G Vishnuram, “Studies on Steel Fibre Reinforced Concrete – A Sustainable Approach”. International Journal of Scientific & Engineering Research, Volume 4, Issue 5, May-2013.
 A.M. Shende, A.M. Pande, M. Gulfam Pathan, “Experimental Study on Steel Fiber Reinforced Concrete for M-40 Grade”. International Refereed Journal of Engineering and Science (IRJES), Vol 1, Issue 1 (September 2012), PP. 043-048.
 Shrikant Harle, Ram Meghe,” Glass Fiber Rein-forced Concrete & Its Properties”, International Journal Of Engineering And Computer Science ISSN: 2319-7242, Vol 2, Issue 12 Dec, 2013.
 Mohammed Alias Yusof, Norazman, Ariffin, Fauzi Mohd Zain, Risby, CP Ng,” Normal Strength Steel Fiber Reinforced Concrete Subjected to Explosive Loading”, International Journal of Sustainable Con-struction Engineering and Technology, Vol 1, No 2 (2010).
 M. Tamil Selvi, T.S. Thandavamoorthy, “Studies on the Properties of Steel and Polypropylene Fibre Reinforced Concrete without any Admixture”, International Journal of Engineering and Innovative Technology (IJEIT), Vol 3, Issue 1, July 2013.
 S. K. Singh, “Polypropylene Fiber Reinforced Con-crete: An Overview”, NBMCW, DEC-2011
 A.R.Santhkumar,”CONCRETE TECHNOLOGY”, Ox-ford University Press, New Delhi, 2007.
 IS: 8112-1989:- Specification for 43 grade ordinary Portland cement.
 IS: 383-1970:- Specification for coarse and fine aggregates from natural sources for concrete.
 IS: 2386 (part –I, II, III & IV) – 1963:- Method of tests for aggregates for concrete.
 IS: 9103-1979:- Concrete admixture specifications.
 IS: 516 – 1959:- Method of test for strength of concrete.
 IS: 5816 – 1999:- Splitting tensile strength of concrete method test.
 IS: 10262 – 2009:- Recommended guide lines for concrete mix design
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