Flexural performance of reinforced concrete beams made by using recycled block aggregates and fibers
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Flexural performance of reinforced concrete beams made by using recycled block aggregates and fibers Wadhah M. Tawfeeq1 · Taghreed Khaleefa Mohammed Ali2 · Yousuf Al‑Kumzari1 · Mouza Al‑Hosni1 · Kholod Al‑Fazari1 · Mariam Al‑Bedwawi1 · Abeer Al‑Bashkardi1 Received: 12 June 2020 / Accepted: 9 November 2020 © Springer Nature Switzerland AG 2020
Abstract This article analyzes the flexural performance of reinforced concrete beams produced by granulated blast furnace slag (GBFS) as a substitute for cement, recycled block aggregates (RBA) as an alternate for ordinary coarse aggregate, normal steel fiber and staplers and polypropylene fibers. Ten reinforced concrete beams with a cross section. 90 mm wide, 150 mm depth and a length of 1000 mm were designed and tested. For this study, a total of 10 mixtures were prepared with different substitutes (in terms of weight) for RBA (0%, 25%, 50% and 100%) and GBFS (0%, 25%, 50% and 70%), while normal steel fiber (0%, 0.5%, 1.0% and 1.5%), 0.5% stapler pin steel fiber and 0.5% polypropylene fibers were added (in terms of volume). The compressive strength and flexural tensile strength were tested for each concrete mixture. Here, the compressive strength and flexural tensile strengths were reduced when using GBFS, RBA and fibers, and the extreme reduction of compressive strength and flexural tensile strength was 50% and 55%, respectively, for 70% GBFS, 25% RBA and 0.5% normal steel fiber. The less decreasing in compressive strength and flexural tensile strength was for a mix of 25% GBFS, 25% RBA and 0.5% stapler pin steel fiber. The role of fiber, GBFS and RBA was more promised in the behavior of reinforced concrete beams. There was an enhancement in flexural capacity for all reinforced concrete beams reaching 27.7%, furthermore when made via using 25%GBFS, 25% RBA and 1.5% normal steel fiber. According to the obtained test data, the utilization of GBFS, RBA, and fibers made the reinforced concrete beams more ductile compared with reference one. Keywords Flexure · Granulated blast furnace slag · Reused block aggregate · Polypropylene and steel fiber · Concrete beam
Introduction * Taghreed Khaleefa Mohammed Ali [email protected]
Wadhah M. Tawfeeq [email protected]; [email protected]
Yousuf Al‑Kumzari [email protected] Mouza Al‑Hosni [email protected] Kholod Al‑Fazari [email protected] Mariam Al‑Bedwawi [email protected] Abeer Al‑Bashkardi [email protected] 1
Faculty of Engineering, Sohar University, 311 Sohar, Oman
Department of Architecture Engineering, Faculty of Engineering, Koya University, Koya KOY45, Kurdistan Region‑F.R., Iraq
2
The concrete was used in the world as a construction material and as a standard material because of its properties like strength, durability, reflection and versatility. These properties make it a solid long-term option for many local and commercial settings. Approximately three-quarters of the concrete volume is composed of aggregates which were extr
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