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首页> 外文期刊>Construction and Building Materials >The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete
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The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete

机译：尾矿抗热骨料混凝土抗硫酸盐侵蚀耦合劣化的机械性能和抗性

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The objective of this study is to prepare recycled aggregate concrete (RAC) using iron ore tailings (LOTs) and test their properties. Three different types of concrete were prepared in this study: natural aggregate concrete (NAC), RAC, and tailing recycled aggregate concrete (TRAC). During testing, a digital image correlation (DIC) system was used to evaluate the transverse strain and axial strain of the concrete samples. The cubic compressive strength and uniaxial compressive stress-strain relationship were analysed, and the three-dimensional pore distribution was investigated based on computed tomography (CT) images. Moreover, the resistance of the three different concrete types to freeze-thaw (F-T) cycles in water and 5% Na2SO4 solution was investigated. Through rapid F-T cycle experiments, the surface damage, weight loss rate, residual compressive strength, and relative dynamic elastic modulus (RDEM) were analysed. The test results revealed that the incorporation of LOTs markedly enhanced the mechanical properties and improved the pore structure of RAC. Furthermore, there was an insubstantial variability of the failure modes between TRAC and control group (NAC and RAC). However, increasing the LOT content resulted in a steeper descending branch of the stress-strain curves, indicating an increase in the brittleness of the concrete. The F-T degradation degree of the concrete in the 5% Na2SO4 environment was greater than that in water. The LOT content should not exceed 20% in consideration of the coupled action of F-T cycles and sulfate attack. (C) 2020 Elsevier Ltd. All rights reserved.
机译：本研究的目的是使用铁矿石尾矿（批次）制备再生的聚集混凝土（RAC）并测试其性质。本研究制备了三种不同类型的混凝土：天然骨料混凝土（NAC），RAC和尾射回骨料混凝土（TRAC）。在测试期间，使用数字图像相关（DIC）系统来评估混凝土样品的横向应变和轴向应变。分析立方抗压强度和单轴压缩应变关系，并基于计算断层扫描（CT）图像研究了三维孔分布。此外，研究了三种不同混凝土类型对水中的冻融（F-T）循环和5％Na 2 SO 4溶液的抗性。通过快速F-T循环实验，分析了表面损坏，减肥率，残余抗压强度和相对动态弹性模量（RDEM）。测试结果表明，批次掺入显着增强了机械性能并改善了RAC的孔隙结构。此外，TRAC和对照组（NAC和RAC）之间存在失效模式的无原样变异性。然而，增加批量含量导致应力 - 应变曲线的陡峭下降分支，表明混凝土的脆性增加。 5％Na2SO4环境中混凝土的F-T降解程度大于水中的混凝土。考虑到F-T循环和硫酸盐攻击的耦合作用，批量不应超过20％。 （c）2020 elestvier有限公司保留所有权利。

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