Influence of Fibers and Fly Ash on Mechanical Properties of Concrete

J.N. Akhtar^1, , T. Ahmad¹, M.N. Akhtar² and H. Abbas³

¹Civil Engineering Department, Aligarh Muslim University, Aligarh, P.O. Box, India

²Civil Engineering Department, Fahad Bin Sultan University, Tabuk Saudi Arabia P.O. Box, K.S.A.

³Specialty units for safety and Preservation of Structures, Civil Engineering Department, King Saud University, Saudi Arabia P.O. Box, K.S.A.

Cite this paper:
J.N. Akhtar, T. Ahmad, M.N. Akhtar and H. Abbas. Influence of Fibers and Fly Ash on Mechanical Properties of Concrete. American Journal of Civil Engineering and Architecture. 2014; 2(2):64-69. doi: 10.12691/ajcea-2-2-2

Abstract

The Present study was carried out to evaluate the influence of addition of Fibres and Class ‘C’ Flyash on the mechanical properties of concrete. Fibre Reinforced Concrete (FRC) is very useful in extreme climate where shrinkage of concrete causes cracks. The Fibre Reinforced Flyash concrete (FRFAC) has been successfully used to minimize cavitations / damages in hydraulics structures. The FRC with and without Fly ash was tested with the fraction of volume of the steel Fibre in concrete which varied from 0.0 to 1.0%. For determining, the compressive strength & permeability cubes of 150 mm size were prepared. Nine cubes of each series were prepared; out of nine, three were used for determining the strength & permeability of cracked & un-cracked concrete. The formation of additional calcium silicate hydrates in the hydrated cement matrix because of the addition of fly ash in FRFAC results in its improved characteristics. The initial tangent modulus of FRC and FRFAC is found to be independent of the quantity of Fibers. The experimental investigation shows that the increase in the Fibre content increases the compressive strength, crushing strain and Poisson’s Ratio of FRC and FRFAC. While increasing the Fibre content, the permeability of concrete reduced. The mode of cracking has been discussed.

Keywords:
FRC steel fiber fly ash permeability

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