Concrete usage in recent decades has skyrocketed, which has led to immense pressure on the natural resources such as sand and aggregates involved in its production. The circular economy concept, i.e., usage and recycling of waste products, can be incorporated into concrete production to alleviate the overutilization of natural resources. LD slag is presently dumped as a landfill, aggravating limited land availability and polluting groundwater by leaching heavy metals in it. Previous studies employed Linz-Donawitz (LD) Slag as an alternative to natural aggregates in concrete production. However, none of the studies has focused on the comparative behavior of weathered LD slag incorporated in normal concrete (NC) and metakaolin-based high-strength concrete (HSC). The present experimental study focuses on determining the optimum replacement level of coarse aggregates with LD Slag. Coarse aggregates were replaced with LD Slag at 25, 50, 75 and 100%. Mechanical and durability properties such as hardened concrete density, ultrasonic pulse velocity, compressive strength, split tensile strength, flexural strength, modulus of elasticity, drying shrinkage, water absorption, sorptivity and abrasion resistance were evaluated. Results showed that replacing 75% of coarse aggregates with LD Slag displayed better results for said properties compared to the control mix, both for NC and HSC. Compressive strength, split tensile strength, flexural strength and modulus of elasticity were improved in the range of 7–9%, 19–29%, 6–11% and 7–16% for 75% replacements at 90 days of testing, respectively. Along with lower water absorption, abrasion, and drying shrinkage, the sorptivity coefficient was also reduced compared to control mixes at all testing ages. The usage of LD slag in concrete will result in waste elimination and management and prevent soil contamination.

近几十年来，混凝土的使用量猛增，这对其生产所涉及的沙子和骨料等自然资源造成了巨大压力。循环经济概念即废品的使用和回收，可以纳入混凝土生产，以缓解自然资源的过度利用。LD 矿渣目前作为垃圾填埋场倾倒，加剧了有限的土地可用性，并通过浸出其中的重金属污染地下水。以前的研究使用林茨-多纳维茨 (LD) 矿渣作为混凝土生产中天然骨料的替代品。然而，没有一项研究集中在普通混凝土 (NC) 和偏高岭土基高强度混凝土 (HSC) 中加入的风化 LD 矿渣的比较行为。本实验研究的重点是确定 LD 渣粗骨料的最佳替代水平。粗骨料用 25%、50%、75% 和 100% 的 LD 炉渣代替。机械和耐久性性能，例如硬化混凝土密度，抗压强度、劈裂强度、弯曲强度、弹性模量、干燥收缩率、吸水率、吸水性和耐磨性进行了评价。结果表明，与对照混合物相比，对于 NC 和 HSC，用 LD 炉渣替代 75% 的粗骨料显示出更好的上述性能结果。在 90 天的测试中，75% 的替代品的抗压强度、劈裂强度、弯曲强度和弹性模量分别提高了 7-9%、19-29%、6-11% 和 7-16%。除了较低的吸水率、磨损和干燥收缩率外，与所有测试年龄的对照混合物相比，吸附系数也降低了。在混凝土中使用 LD 矿渣将导致废物的消除和管理，并防止土壤污染。