SHEAR BEHAVIOUR OF REINFORCED-CONCRETE BEAMS INCORPORATING IRON FILINGS AS SAND REPLACEMENT

IF 0.8 Q4 ENGINEERING, CIVIL

Advances in Civil and Architectural Engineering Pub Date : 2023-10-18 DOI:10.13167/2023.27.6

Abbas Dawood, Hayder Al-Khazraji, Dua'a Mahmood

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Abstract

This study examined the influence of partial sand replacement with iron filings on the mechanical and physical characteristics of concrete, as well as conducted experimental tests of the shear behaviour of reinforced-concrete beams. Four replacement rates were used in this study, i.e., 5 %, 10 %, 20 %, and 30 % with a reference mixture containing no iron filings. At ages 7, 14, and 28 days, mechanical property tests (slump, density, ultrasonic pulse velocity, compressive strength, and splitting strength tests) were conducted. In addition, the shear behaviour of five reinforced-concrete beams with the same replacement rates (0 %, 5 %, 10 %, 20 %, and 30 %) were experimentally tested. Tests were conducted to determine the ultimate load failure, final deflection, energy absorption, stiffness, ductility index, compressive stress, and crack formations. According to the results, the correlation between the slump test and iron filings is positive; however, that for absorption is negative. With a higher percentage of iron-filing replacement, the density and ultrasonic pulse velocity increased. For specimens with 30,00 % iron filings, the densities, pulse velocities, and slumps were raised by 6,27 %, 2,44 %, and 58,33 %, respectively, compared to the reference specimens, whereas the absorption rate decreased by 20,00 %. Having 20,00 % iron filings produced the maximum compressive and splitting strengths of 28,00 %, which was 4,60 % higher than the reference mixture, whereas 30,00 % iron filings produced the highest flexural strength, which was 9,50 % higher than the reference mix. The findings of beam testing revealed that increasing the iron-filing content in concrete beams increased the final failure load, final deflection, ductility index, and energy absorption by 6,70 %, 10,29 %, 11,30 %, and 35,00 %, respectively. The initial and secant stiffnesses decreased at rates of 12,60 % and 3,10 %, respectively.

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用铁屑代替砂子的钢筋混凝土梁的剪切性能

本研究考察了用铁屑代替部分砂子对混凝土力学和物理特性的影响，并对钢筋混凝土梁的抗剪性能进行了实验测试。在本研究中使用了四种替代率，即5%、10%、20%和30%，参考混合物中不含铁屑。在第7、14和28天进行力学性能测试(坍落度、密度、超声脉冲速度、抗压强度和劈裂强度测试)。此外，实验测试了5根具有相同替换率(0%、5%、10%、20%和30%)的钢筋混凝土梁的剪切性能。进行试验以确定极限载荷破坏、最终挠度、能量吸收、刚度、延性指数、压应力和裂纹形成。结果表明，坍落度试验与铁屑呈正相关;然而，吸收是负的。随着补铁率的提高，密度和超声脉冲速度增大。与参考样品相比，含30 %铁屑的样品密度、脉冲速度和坍落度分别提高了6.27%、2.44%和58.33%，而吸收率降低了20 %。20000%的铁屑产生的最大抗压和劈裂强度为2800%，比参考混合物高4.60%，而3000%的铁屑产生的最高抗折强度，比参考混合物高9.50%。梁试验结果表明，增加混凝土梁中的铁含量，最终破坏荷载、最终挠度、延性指数和能量吸收分别提高了6%、70%、10%、29%、11%、30%和3500%。初始刚度和割线刚度分别以12.60%和3.10%的速率降低。

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Advances in Civil and Architectural Engineering

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