Flexural Behaviour of Modified Weight SIFCON Using Combination of Different Types of Fibres

SIFCON is featured construction material has a high strength in addition to large ductility making it convenient for special structural applications. However, the SIFCON unit weight is higher than fibre reinforced concrete due to the heavy weight of the high steel fibre content. This paper aims to investigate the flexural behaviour of Modified Weight Slurry Infiltrated Fibre Concrete (MWSIFCON) by using combination of different types of fibres which are micro steel fibres, macro hooked end steel fibres and polypropylene fibres. For this purpose, 21 prisms and 84 cubes are casted. The volumetric ratios (7%, 4% and 3%) for micro steel fibres, macro hooked end steel fibres and polypropylene fibres respectively are used of each type alone for the purpose of comparison. Moreover, hybrid fibres from combination of two types of these fibres using 50% from ratios above of each type are used to investigate the flexure behaviour of prisms. The other related properties for resulted SIFCON are studied from cube tests. The results indicate that SIFCON of combination macro hook end steel fibres with polypropylene fibres gives a good density for SIFCON with 18.66 KN/m3 and performed adequate flexure strength with 8.09 MPa. Also, it has kindly reduced in the water absorption of SIFCON.