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Go to Editorial ManagerThis study investigates the thermal properties of Limestone Calcined Clay Cement (LC3) concrete that includes steel fibres under elevated temperatures of 100°C, 200°C, 400°C, and 600°C. LC3 serves as an eco-friendly substitute for conventional cement, providing lower carbon emissions and enhanced durability. In this research, concrete specimens incorporating LC3 and steel fibres (The volume of taken as 0.5%, 1%, 1.5% and 2% of cement) were subjected to a range of elevated temperatures. The parameters such as residual compressive strength, mass loss, surface changes and flexural were analyzed. The Scanning Electron Microscopy (SEM) images of Ordinary Portland cement (OPC) and LC3 normal concrete at 100oC and 600oC were studied. Results indicated that steel fibre reinforcement significantly improved the residual strength and structural integrity of LC3 concrete at high temperatures. The LC3 retained 10–15% higher strength than OPC at 600°C. These findings suggest that steel fibre-reinforced LC3 concrete can be a feasible option for structural applications where thermal resistance is critical, contributing both to sustainability and fire safety in construction.
AbstractThis research includes the study of the effect of adding steel fibres resulting from cutting chicken wire (which is available in Iraqi markets now) as fibres added to the polymer concrete. These fibres were added with percentages of concrete volumes. These percentages were (0.5%) and (1%). Reference concrete mix was also made for comparative reasons. From the results, it can be noted that the increasing of compressive strength of SFPC1 comparing with RPC at 28 days equal to 9.90%, whereas the increasing of compressive strength of SFPC2 comparing with RPC at 28 days is equal to 15.48%. The increasing of splitting strength of SFPC1 comparing with RPC at 28 days equal to 15.50%, whereas the increasing of SFPC2 comparing with RPC at 28 days is equal to 21.40%. The increasing of flexural strength of SFPC1 comparing with RPC at 28 days equal to 10.80%, whereas the increasing of SFPC2 comparing with RPC at 28 days is equal to 20.63%.Results proved that adding of steel fibres with these percentages lead to improvements in compressive strength, splitting strength and flexural strength of concretes containing steel fibres, but the improvement in flexural strength appeared more clearly. Results proved also an increasing in densities of fibre concrete samples according to these made of reference mix.
This study presents an investigation of the mechanical properties of normal concrete reinforced with discarded steel fibers (DSFs) resulting from tire manufacturing. DSFs were added to concrete in two different volume fractions of (0.25 %, and 0.5 %), and these fibers have dimensions of (40 mm length×0.92 mm diameter). The results showed that the compressive strength of the concrete was enhanced by (8.8%, and 3.3%) by adding of DSFs. However, the workability of concrete decreased at all added ratios. While the density is slightly changed. Also, the results indicate that the modulus of elasticity shows slight increases by (3.06%, and 2.25%). Additionally, the incorporation of DSFs improves the splitting tensile strength and modulus of rupture significantly. For concrete mixes having volume fractions of 0.25% and 0.5%, the splitting tensile increased by (7.89%, and 23.68%), and the modulus of rupture increased by (6.67% and 25.58%), respectively. It was concluded that using this type of discarded fibers can improve the mechanical properties of concrete as an alternative type for other types of industrial fibers.