Abstract

The addition of Electric Arc Furnace Dust (EAFD) in concrete is a good solution to encapsulate its potential toxic elements and to contribute to the valorisation of industrial wastes. This paper investigates the feasibility of using EAFD as an addition to concrete production. Four experimental mixes have been produced (one of traditional concrete and three introducing a 5, 10 and 15% of EAFD per cement weight without replacing any material). The mechanical properties of the resultant concrete mixtures (compressive strength, elastic modulus and density) were evaluated. In addition, the natural carbonation of EAFD concrete mixtures was studied. Finally, a microstructural campaign was carried out to study the morphology and microstructure of the considered concrete mixtures. Results showed that concrete with an addition of 15% of EAFD per cement weight had a higher compressive strength and elastic modulus and a lower carbonation depth in comparison with traditional concrete.

摘要

在混凝土中添加电弧炉粉尘 (EAFD) 是一种很好的解决方案，可以封装其潜在的有毒元素并有助于工业废物的增值。本文研究了使用 EAFD 作为混凝土生产的补充的可行性。已经生产了四种实验混合物（一种是传统混凝土，三种是在不更换任何材料的情况下，每水泥重量分别引入 5%、10% 和 15% 的 EAFD）。对所得混凝土混合物的力学性能（抗压强度、弹性模量和密度）进行了评估。此外，研究了 EAFD 混凝土混合物的自然碳化。最后，进行了微观结构研究，以研究所考虑的混凝土混合物的形态和微观结构。