Experimental study on mechanical properties of macro synthetics fibers-reinforced binary concrete made by ground granulated blastfurnace slag and fly ash

Research Article
M. Venkata Maheswara Reddy and S. Krishnaiah
Civil Engineering
Macro synthetic fibers, Fly ash, Ground-granulated blast furnace slag, Mechanical properties, Supplementary cementitious material, Fiber reinforced concrete, Binary concrete.

Concrete production involves using vast quantities of ordinary portland cement (OPC), the primary binder material. However, OPC production uses high embodied energy and emits more CO2 into the atmosphere. One of the alternatives is using industrial waste or by products such as fly ash (FA) and ground granulated blast furnace slag (GGBS) as supplementary cementitious material. However, the main drawbacks of conventional concrete with or without supplementary cementitious material are its brittleness and lower elasticity. This led to the addition of fibers to concrete. The current experimental study’s objective is to ascertain concrete’s mechanical properties before using it for pavements. The proportions of supplementary cementitious materials (SCM) such as ground granulated blast furnace slag (GGBS), fly ash (FA) and macro synthetic fiber (MSF) were tuned to assess the properties of M40 grade fiber-reinforced concrete. In this study, the effects of macro synthetic fibers (MSF), 20% FA class F, and 20%, 25%, 30%, 35%, and 40% GGBS were used as supplementary cementitious materials to produce MSF-reinforced binary concrete of grade 40 MPa. MSF of aspect ratio 36 was added to the mix at various percentages: 0%, 0.5%, 1%, 1.5%, and 2% by volume fraction. The results showed that the MSF fiber-reinforced binary concrete workability decreased with an increase in the addition of MSF. Mechanical Properties such as compressive strength, split tensile strength and flexural strength for fiber-reinforced binary concrete mix with the addition of 1.5% MSF, replacement of 20% FA and 30% GGBS of cement content yield satisfactory results compared to the control mix. Incorporating MSF, GGBS, and FA reduces OPC usage, enhances strength characteristics, and contributes to cost reduction in construction.