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Effect of iron tailings and slag powders on workability and mechanical properties of concrete
Frontiers in Materials ( IF 3.2 ) Pub Date : 2021-06-24 , DOI: 10.3389/fmats.2021.723119
Wu Ruidong , Shen Yu , Liu Juanhong , Cheng Linian , Zhang Guangtian , Zhang Yueyue

Tailings are one of the largest solid wastes in stock at present. In order to improve the comprehensive utilization rate of tailings, especially to solve the difficult problems of the fine-grained tailings, the concrete composite admixture was prepared by using iron tailings powder and slag powder. In order to study the influence of iron tailings powder on the workability and long-term mechanical properties of concrete, C30 and C50 concrete with different iron tailings powder dosage were prepared, and the slump, expansion, flexural strength, splitting tensile strength and compressive strength of concrete at different ages were tested. The results show that the proper addition of iron tailing powder is beneficial to the working performance of concrete and can effectively reduce the time-loss of concrete fluidity.When the content of iron tailings powder in the composite admixture is 50%, the 1080d long age strength of C30 and C50 concrete can reach 50.3MPa and 80.7MPa. Based on the 28d compressive strength, the relative strength-age prediction model of iron tailings powder concrete was established. The calculation and experimental results show that the model can accurately predict the compressive strength of micro-powder concrete of iron tailings at long age, and the error rate is less than 1%. The results lay a theoretical foundation for the utilization of iron tailings in concrete.

中文翻译:

铁尾矿和矿渣粉对混凝土和易性和力学性能的影响

尾矿是目前存量最大的固体废物之一。为提高尾矿综合利用率,特别是解决细粒尾矿难解决的问题,采用铁尾矿粉和矿渣粉制备混凝土复合外加剂。为研究铁尾矿粉对混凝土和易性和长期力学性能的影响,制备了不同铁尾矿粉用量的C30和C50混凝土,并对其坍落度、膨胀、弯曲强度、劈裂抗拉强度和抗压强度进行了研究。对不同龄期的混凝土进行了测试。结果表明,适量添加铁尾矿粉有利于混凝土的工作性能,可有效减少混凝土流动性的时间损失。当复合外加剂中铁尾矿粉的含量为50%时,C30和C50混凝土1080d长时效强度可达50.3MPa和80.7MPa。基于28d抗压强度,建立了铁尾矿粉混凝土的相对强度-龄期预测模型。计算和试验结果表明,该模型能够准确预测铁尾矿微粉混凝土长龄期抗压强度,误差率小于1%。研究结果为铁尾矿在混凝土中的利用奠定了理论基础。计算和试验结果表明,该模型能够准确预测铁尾矿微粉混凝土长龄期抗压强度,误差率小于1%。研究结果为铁尾矿在混凝土中的利用奠定了理论基础。计算和试验结果表明,该模型能够准确预测铁尾矿微粉混凝土长龄期抗压强度,误差率小于1%。研究结果为铁尾矿在混凝土中的利用奠定了理论基础。
更新日期:2021-06-24
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