Abstract
Amorphous micro-steel (AMS) fibre made by cooling of liquid pig iron is flexible, light and durable to corrosion, then to be compatible with high flowable and disperable states of mixing as well as high ductile post-cracked performances to apply in fibre-reinforced cementitious composites. In the current research, AMS fibre-reinforced cementitious composites based on cement and alkali-activated ground granulated blast furnace slag mortars were newly manufactured and evaluated for the strength and ductile characteristics mainly by direct tensile and shear transfer tests in the variation in the volume of AMS fibres with two different lengths of 15.0 and 30.0 mm. As a result, it was found that 1.0–1.25% fibre volume fractions were recommendable for AMS fibre-reinforced cementitious composites to maximize direct tensile strength, ductile tensile strain, and shear strength of the composites. However, a further fraction of AMS fibre lowered these mechanical characteristics. Simultaneously, it could be said that AMS fibre-reinforced cementitious composites exhibited up to about 3.7 times higher in direct tensile strength and up to 2.3 times higher in shear strength, compared to AMS fibre-free specimens.
Highlights
The feasibility of a new micro-steel fibre reinforced cementitious composite based on cement and alkali-activated ground granulated blast furnace slag (GGBS) mortars was experimentally assessed for the strength and ductile characteristics mainly by direct tensile and shear transfer tests in the variation in the volume of Amorphous micro-steel (AMS) fibres with two different lengths of 15.0 and 30.0 mm
The ductile capacity of AMS fibre-reinforced cementitious composites was reduced for engineered cementitious composites (ECC) and strain-hardening cementitious composites (SHCC) mixes, imposing high ductile and strain-hardening characteristics in direct tensile post-cracked region as the maximum tensile strain was above 2.0% (Fischer and Li 2003; Lee et al 2012; Choi et al 2014; Cho et al 2012)
A series of experimental programs was investigated to establish the feasibility of developing a new micro-steel fibre cementitious composite using OPC and GGBS mixing mortar and amorphous micro-steel fibres with
Summary
Attempts to utilize fibre cementitious or concrete composites mixed with metallic or non-metallic fibres had been greatly made in fields of high rise building and infra structures in order to enhance additional requirements of high ductility, performance and durability (Narayanan and Darwish 1987; Ashour et al 1992; De Hanai and Holanda 2008; Fischer and Li 2003; Kim et al 2009; Lee et al 2012; Choi et al 2014). A crystal in metal is formed when liquid metal is cooled slowly at thousands of degrees per second (Won et al 2012; Seo 2006) These crystalline steels are basically an anisotropic material, consisting of regular arrays of atoms, so that their mechanical characteristics are dependent on crystal directions, such as in exhibiting the modulus of elasticity, electrical and heat conductivities, and refractivity. The feasibility of a new micro-steel fibre (i.e. amorphous micro-steel fibre made by cooling of liquid pig iron) reinforced cementitious composite based on cement and alkali-activated ground granulated blast furnace slag (GGBS) mortars was experimentally assessed for the strength and ductile characteristics mainly by direct tensile and shear transfer tests in the variation in the volume of AMS fibres with two different lengths of 15.0 and 30.0 mm. In addition to optimize the volume of the steel fibre in the mix, the slump flow, the compressive strength, the direct tensile behavior, and the shear transfer were examined
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