Martínez-García Rebeca, Guerra-Romero M Ignacio, Morán-Del Pozo Julia M, Brito Jorge de, Juan-Valdés Andrés
Department of Mining Technology, Topography and Structures, University of León. Campus de Vegazana s/n, 24071 León, Spain.
Department of Agricultural Engineering and Sciences, University of León, Avenida de Portugal 41, 24071 Léon, Spain.
Materials (Basel). 2020 Feb 14;13(4):868. doi: 10.3390/ma13040868.
The use of construction and demolition wastes (C&DW) is a trending future option for the sustainability of construction. In this context, a number of works deal with the use of recycled concrete aggregates to produce concrete for structural and non-structural purposes. Nowadays, an important number of C&DW management plants in the European Union (EU) and other countries have developed robust protocols to obtain high-quality coarse recycled aggregates that comply with different European standards in order to be used to produce new concrete. The development of self-compacting concrete (SCC) is another way to boost the sustainability of construction, due to the important reduction of energy employed. Using recycled aggregates is a relatively recent scientific area, however, studies on this material in the manufacture of self-compacting concrete have proven the feasibility thereof for conventional structural elements as well as high-performance and complex structural elements, densely reinforced structures, difficult-to-access formwork and difficult-to-vibrate elements. This paper presents an original study on the use of coarse recycled concrete aggregate (CRA) to obtain self-compacting concrete. Concrete with substitution ratios of 20%, 50% and 100% are compared with a control concrete. The purpose of this comparison is to check the influence of CRA on fresh SCC as well as its physical and mechanical properties. The parameters studied are material characterization, self-compactability, compressive strength, and tensile and flexural strength of the resulting concrete. The results conclude that it is feasible to use CRA for SCC production with minimal losses in the characteristics.
使用建筑和拆除废物（C&DW）是建筑可持续发展的一种未来趋势选择。在此背景下，许多研究致力于利用再生混凝土骨料来生产用于结构和非结构用途的混凝土。如今，欧盟（EU）和其他国家的大量C&DW管理工厂已经制定了完善的协议，以获得符合不同欧洲标准的高质量粗再生骨料，用于生产新的混凝土。自密实混凝土（SCC）的发展是提高建筑可持续性的另一种方式，因为其能耗大幅降低。使用再生骨料是一个相对较新的科学领域，然而，关于这种材料在自密实混凝土制造中的研究已经证明，其对于传统结构构件以及高性能和复杂结构构件、密集配筋结构、难以施工的模板和难以振捣的构件都是可行的。本文介绍了一项关于使用粗再生混凝土骨料（CRA）来制备自密实混凝土的原创性研究。将替代率为20%、50%和100%的混凝土与对照混凝土进行比较。这种比较的目的是检验CRA对新鲜SCC及其物理和力学性能的影响。所研究的参数包括材料特性、自密实性、抗压强度以及所得混凝土的抗拉和抗弯强度。结果表明，使用CRA生产SCC是可行的，且特性损失最小。
