Department of Financial Economics, Accounting and Modern Language, Rey Juan Carlos University, Paseo de los Artilleros, s/n, 28032 Madrid, Spain.
Departamento de Tecnología de la Edificación, Universidad Politécnica de Madrid, Avenida Juan de Herrera 6, 28040 Madrid, Spain.
Int J Environ Res Public Health. 2023 Feb 19;20(4):3709. doi: 10.3390/ijerph20043709.
Achieving sustainable management and efficient use of natural resources stands out as one of the goals included in the Goals for Sustainable Development in the 2030 Agenda. The construction sector is currently far from presenting an efficient model in terms of treating waste generated by it. Variations in the physical and chemical properties of recycled aggregates coming from construction and demolition waste are one of the main reasons of their limited use in the production of construction materials. This research presents a physicochemical characterization of three different types of recycled aggregates coming from different types of waste: concrete, ceramic and mixed. Physical characterization shows that recycled concrete aggregate has better physical properties compared with mixed recycled aggregate and ceramic recycled aggregate, which makes it more suitable for use in masonry mortars and concrete, due to its higher dry density (2210.33 kg/m), its lower content of fines (5.17%), its lower friability coefficient (24.60%), and its water absorption coefficient (6.70%). Chemical characterization shows that none of the tested recycled aggregates contains traces of harmful chemical agents that exceed the limits established by the reference regulations. Finally, the statistical analysis shows good homogeneity for these raw materials, obtaining low coefficients of variation and values within the recommended in each of the calculated confidence intervals.
实现自然资源的可持续管理和高效利用是 2030 年可持续发展议程目标之一。建筑行业目前远未形成处理其产生的废物的有效模式。建筑和拆除废物中再生骨料的物理和化学性质的变化是限制其在建筑材料生产中应用的主要原因之一。本研究对三种不同类型的来自不同废物的再生骨料进行了物理化学特性分析：混凝土、陶瓷和混合。物理特性分析表明，与混合再生骨料和陶瓷再生骨料相比，再生混凝土骨料具有更好的物理性能，由于其更高的干密度（2210.33kg/m）、较低的细粉含量（5.17%）、较低的易碎性系数（24.60%）和吸水率系数（6.70%），因此更适合用于砌体砂浆和混凝土。化学特性分析表明，测试的再生骨料中均不含超过参考法规规定限值的有害化学物质痕迹。最后，统计分析表明这些原材料具有良好的均一性，在每个置信区间内计算的低值和变化系数都在推荐范围内。
