Design of fibre reinforced concrete using dramix steel fibres

Nayaka, Ramesh and Vandana, C P and Prabhakaran, T (2015) Design of fibre reinforced concrete using dramix steel fibres. In: International Conference On Engineering and Technology, March 17, 18 2015, Colombo, Srilanka.

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Abstract

Fibre reinforced concrete leads to improvements of both the strength and flexural toughness characteristics of concrete. In this investigation, the effect of dramix steel fibres on the compressive strength and flexural toughness of fibre reinforced concrete was studied by targeting the characteristics strength at 7 days. Designed a mix to achieve 20 MPa compressive strength at seven days and a slump of 100 mm for M35 grade concrete. The comparison on the above said properties between the specimens prepared and found the optimum mix design and required dramix steel fibre to reach the targeted slump and compressive strength at seven days. The experimental results showed that the targeted compressive strength of fibre reinforced concrete about 20 MPa was achieved by the mix with 0.3% dramix steel fibres for M35 grade of concrete. The variation of compressive strength in 3 trial mixes were found up to 30 MPa and lesser than required workability for plain concrete, 26 MPa and more workability obtained by using 0.28% dramix steel fibre by volume of cement and 0.25% superplasticizer by volume of cement and 24 MPa achieved for same quantity of steel fibre without using of superplasticizer respectively. However, the mixes with 0.28% steel fibres by volume of cement produced negative effects on required target on both the compressive strength and workability. Flexural toughness also studies, the results on the toughness indices showed that the 0.3% steel fibre by volume of cement possess no post-cracking flexural toughness. Though, the flexural deflection and toughness of the dramix steel fibre was significantly enhanced by the addition of superplasticizer and variation of water/cement ration; the dominance of the steel fibre on the first crack flexural deflection and toughness of 0.3% steel fibres by volume of cement was evident. The mixes with 0.3% steel fibres and 0.53 water/cement ratio of fibre reinforced concrete reported the optimization of strength parameter of mix design for FRC with 20 MPa compressive strength at 7 days and a slump of 100 mm.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Compressive strength, Dramix steel fibres, Flexural Toughness and Workability
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 12 Feb 2016 10:15
Last Modified: 12 Feb 2016 10:15
URI: http://eprints.manipal.edu/id/eprint/145325

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