This work analyzes the experimental behavior of electric arc furnace slag (EAFS) concretes in terms of full stress-strain behavior under uniaxial compression. Tests are carried out on samples cured for 28 days and for more than 6 years, representing both short- and long-term conditions. Results are discussed in terms of main mechanical strength (compressive and indirect tensile strength), deformative properties in the axial and transverse direction, i.e., secant modulus and Poisson’s coefficient, stress-strain relations during the load history, damage evolution and critical stress. Furthermore, two models for predicting the stress-strain behavior of concrete under repeated cycles are shown, for both natural aggregate concrete (NAC) and EAFS concrete. Results indicate that EAFS concrete has higher compressive and tensile strength than the reference, as well as better deformative properties. The aggregates type influences the deformability of the concrete also beyond the elastic regime, both in the longitudinal and transverse direction, with a different extent depending on the applied stress. Specifically, EAFS concrete attained higher secant modulus particularly at low-stress levels, while such improvement is less pronounced at high stresses. Instead, no significant differences were recorded concerning Poisson’s coefficient between NAC and EAFS concrete. The analytical models proposed hereafter well predict the experimental behavior for both concrete types.

中文翻译：

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单轴压缩下电弧炉矿渣混凝土的应力应变行为：短期和长期评估

这项工作分析了电弧炉矿渣（EAFS）混凝土在单轴压缩下的全应力-应变行为的实验行为。测试对固化 28 天和 6 年以上的样品进行，代表短期和长期条件。从主要机械强度（压缩和间接拉伸强度）、轴向和横向变形特性（即正割模量和泊松系数）、载荷历史过程中的应力-应变关系、损伤演化和临界应力方面对结果进行了讨论。此外，还显示了天然骨料混凝土 (NAC) 和 EAFS 混凝土两种用于预测重复循环下混凝土应力应变行为的模型。结果表明，EAFS 混凝土具有比参考混凝土更高的抗压和抗拉强度，以及更好的变形性能。骨料类型对混凝土变形能力的影响也超出弹性范围，无论是纵向还是横向，其程度取决于所施加的应力。具体而言，EAFS 混凝土获得了更高的割线模量，特别是在低应力水平下，而这种改进在高应力水平下不太明显。相反，NAC 和 EAFS 混凝土之间的泊松系数没有显着差异。下面提出的分析模型很好地预测了两种混凝土类型的实验行为。