Hybrid Fiber Reinforced Concrete Containing Pumice and Metakaolin

Document Type : Research Papers


1 M.Sc. Student, Department of civil engineering, Amirkabir University of Technology, Tehran, Iran.

2 Professor, Department of civil engineering, Amirkabir University of Technology, Tehran, Iran.


Fiber reinforced concrete (FRC) has been widely used due to its advantages over plain concrete such as high energy absorption, post cracking behaviour, flexural and impact strength and arresting shrinkage cracks. But there is a weak zone between fibers and paste in fiber reinforced concretes and this weak zone is full of porosity, especially in hybrid fiber reinforced concretes. So it is necessary to apply a material that reduces porosity and consolidates this transition zone. In this research first, the flexural and impact resistance tests were carried out on hybrid fiber reinforced concretes to choose the optimum percentage of steel and polypropylene fibers based on flexural toughness, modulus of rupture and impact resistance. Finally, compressive strength tests were conducted on selected hybrid fiber reinforced concretes containing pumice and metakaolin to choose the better pozzolan and replacement level based on compressive strength test. Results showed that, metakaolin with 15% substitution for cement had a significant role in increasing compressive strength. However, pumice did not act on the same basis.


ACI 544.2R-89, (1996). Measurement of properties of fiber reinforced concrete reported. ACI Farmington Hills, MI, US: American Concrete Institute.
Badr, A. and Ashour, A.F. (2005). “Modified ACI drop weight impact test for concrete”, ACI Material Journal, 102(4), 249-255
Balaguru, P.N. and Shah, S.P. (1992). Fiber reinforced cement composite, MCGraw_Hill Inc., New York.
Banthia, N. and Bindiganavil, V. (2002). “Fiber reinforced cement based composites under drop weight impact loading: test equipment and material influence”, ACI Special Publication,  Vol. 206, 411-428.
Banthia, N. and Nadakumar, N. (2003). “Crack growth resistance of hybrid fiber cement composite”, Cement and Concrete Composite, 25(1), 3–9.
Banthia, N. and Sappakittipakom, M. (2007). “Toughness enhancement in steel fiber reinforced concrete through fiber hybridization”, Cement and Concrete Research, 37(9), 1366–1372.   
Bentur, A. and Mindess, S. (1990 ). “Fiber reinforced cementitious composite”, Elsevier Science Publishers Limited, Essex, England, p. 449.  
Bindiganavile, V. and Banthia, N. (2001). “Machine effect in the drop weight impact testing of plain concrete beams”, Proceeding of 3rd International Conference on Concrete under Severe Conditions, UBC, Vancouver, Canada.
Khaloo, A.R., Afshari, M. (2005), “Flexural behaviour of small steel fibre reinforced concrete slabs”,  Cement & Concrete Composites, 27, 141-149.
Klieger, P. and F. Lamond, J. (1992). “Significant of test and properties of concrete and concrete making material”, ASTM-1916, Race Street, Philadelphia.
Meddah, M.S. and Bencheikh, M. (2009). “Properties of concrete reinforced with different kinds of industrial waste fibre materials”, Construction and Building Materials, 23(10), 3196–3205.
Pourmoghaddam, A., Taghaddos, H., Mahmoodzadeh, F. and Shekarchi, M. (2005). “Distribution of fibers in steel fiber reinforced concrete”, Journal of Faculty of Engineering, University of Tehran, 39(3), 311-318, (in Persian).
ASTM C1609/C1609M – 10, Standard test method for flexural performance of fiber-reinforced concrete (using beam with third-point loading), West Conshohocken, PA, US: ASTM International, 2010.