Steel Fiber Addition in Eco-Friendly Zero-Cement Concrete: Proportions and Properties

Abstract

The main objective of this paper is to study the behavior of eco-friendly zero-cement concrete, its proportions, and its properties. The experimental program involves casting and testing many specimens divided into three main groups according to the percentage of added steel fibers in order to investigate the effect of steel fibers on the density, compressive strength, modulus of elasticity, and splitting tensile strength of concrete. The experimental outcomes indicated that the percentage of steel fibers has a small impact on the dry density: adding 0.5% and 1% of steel fibers increased the dry density by about 0.9% and 1.6% respectively. The percentage of steel fibers has an important impact on the compressive strength: after 28 days, steel fibers increased the compressive strength by about 4.9% and 12.8% for added steel fiber percentages of 0.5% and 1%. Also, the results indicated that steel fiber had an important impact on the splitting tensile strength in concrete after 28 days of curing: adding 0.5% and 1% steel fibers increased the splitting tensile strength by about 11.8%and 23.2% respectively. Finally, adding steel fibers has an impact on the modulus of elasticity: after 28 days, adding 0.5% and 1% steel fibers improved the modulus of elasticity approximately by 1.7% and 5%.

The Influence of UHPFRC Jacket Steel Fiber Content on Strengthening Damaged Columns

“…Since the MSF content included in the UHPFRC was 0, 0.5, 2.0, and 2.5%, the compressive strength increased by 147.7, 169.1, 218.49, and 193.03%, respectively. These results corroborate previous studies [18][19][20][21]. However, compressive strength was observed to increase with MSF content of 0.5-2.0%, while it slightly decreased when using more than 2%.…”

The Effect of Different Curing Methods on the Properties of Reactive Powder Concrete Reinforced with Various Fibers

“…For MSF and WSF mixes (Figure 18), the results were almost convergent with the MSF mix results being a little higher due to the higher surface area offered by the MSF, which increases the attached surfaces and the Interfacial Transition Zone (ITZ) and hence augments the resistance to the tensile loads by effectively transferring loads from the matrix to the fibers. The results are in accordance with [20][21][22]. Regarding the effect of different fibers on the splitting strength of RPC, the increase after 28 days of curing for AC was 24.75, 39.37, and 71.19% for WF-RPC, CF-RPC, and MF-RPC, respectively, while for CC it was 34.29, 50.4, and 59.75% for WF-RPC, CF-RPC, and MF-RPC, correspondingly, and for WC it was 32.89, 61.33, and 87.25%, respectively.…”

“…Reportedly, deformed steel fibers give 3 to 7 times the fiber-matrix binding strength of straight fibers. Several factors, including fiber shape, fiber length, and curing conditions, influence the degree to which the mechanical properties are enhanced [21,22]. Curing of concrete is an important factor in getting the required properties, such as strength and durability.…”