Abstract
Concrete is weak in tension and strong in compression which results in brittle failure. This is obviously unacceptable for any construction materials. Thus, concrete requires some type of tensile reinforcement to balance its brittle behavior and improves its tensile strength. Adding of fibers is one of the most prevalent techniques to enhance the tensile behavior of concrete. Fiber slows cracking phenomena and increases energy absorption capacity of the structure. Majority researchers focus on mechanical performance of fiber reinforced concrete. In this research, the influence of various dosages of steel fibers (0%, 1.0%, 2.0%, 3.0%, and 4.0% by weight of cement) is investigated on the mechanical and durability properties of concrete. Mechanical properties such as compressive strength and split tensile strength are studied at 7- and 28-days curing. To evaluate the durability aspects of each mix, various parameters such as water absorption, acid attack resistance, and permeability are investigated. Results indicate that strength was increased up to 2% addition of steel fiber and then reduced gradually. It also indicates that, durability parameter of concrete for example water absorption, permeability, and acid attack resistance considerably improved with incorporation of steel fibers at 2.0% incorporation of steel fibers. Therefore, it is recommended to mix steel fibers up 2.0% by weight of cement to achieved maximum benefits.
Highlights
In construction industries, concrete is highest used material for its high compressive strength
Compressive strength is the measure of greatest compressive loading that concrete can withstand
The compressive strength test is performed under the standard procedure of ASTM as ASTM C39/C39M [31] for cylindrical samples having standard dimensions as 150mm diameter and 300mm length as shown in Figure 1 at the ages of 7 and 28 days
Summary
Concrete is highest used material for its high compressive strength. The study showed that uneven incorporation of steel fiber would affect the fluidity and uniformity of concrete mixing and even result in fiber bonding, which eventually affects the reinforcement effect of mechanical properties” [7,8,9].”. Research displayed that unequal adding of SFs will affect the concrete uniformity and fluidity in mixing & even bonding of fiber, which influence mechanical performances [11]. Adding of SFs in concrete raise the strength and the ductility [13].They realized that fiber increased the peak pull-out load [21].SFs can enhance the tensile strength of concrete to almost 40% [22].
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