Juan-Valdés Andrés, García-González Julia, Rodríguez-Robles Desirée, Guerra-Romero Manuel Ignacio, López Gayarre Fernando, De Belie Nele, Morán-Del Pozo Julia M
Department of Agricultural Engineering and Sciencies, University of León, 24071 León, Spain.
Department of Agriculture and Feeding, University of La Rioja, 26006 Logroño, Spain.
Materials (Basel). 2018 Dec 21;12(1):24. doi: 10.3390/ma12010024.
This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two different mixes were used: the first one was a conventional concrete mix provided by Prefabricados de Hormigón Pavimentos Páramo S.L., one of the collaborating companies in this study, and the other was a mixture in which wt 50% of the natural coarse aggregates were substituted for recycled mixed aggregates ceramic (RMAc). This recycled aggregate is a heterogeneous mixture of unbound aggregates, concrete, ceramic, etc., used as a secondary recycled aggregate and commonly produced in a lot of recycling plants in many European countries. This material was supplied by Tecnología y Reciclado S.L., the other collaborating company. Both mixtures were representative in order to establish the comparative behavior between them, taking into account that smaller percentages of replacement of the natural with recycled aggregates will also produce good results. This percentage of substitution represents a high saving of natural resources (gravel) and maintains a balanced behavior of the recycled concrete, so this new material can be considered to be a viable and reliable option for precast mass concrete paving elements. The characterization of the recycled precast elements, covering mechanical, microstructural, and durability properties, showed mostly similar behavior when compared to the analogous industrially-produced pieces made with conventional concrete.
本研究旨在证明使用再生混凝土生产两种广泛应用于建筑的预制构件（如路缘石和铺路砖）的可行性。该再生混凝土采用再生混合骨料替代50%的天然砾石制成，其中陶瓷含量较高（>30%）。为了证明这种大体积混凝土再生预制构件的质量，使用了两种不同的混合料：第一种是由本研究的合作公司之一Prefabricados de Hormigón Pavimentos Páramo S.L.提供的传统混凝土混合料，另一种是用重量比50%的陶瓷再生混合骨料（RMAc）替代天然粗骨料的混合料。这种再生骨料是未结合骨料、混凝土、陶瓷等的非均匀混合物，用作二次再生骨料，在许多欧洲国家的许多回收厂普遍生产。这种材料由另一家合作公司Tecnología y Reciclado S.L.提供。考虑到用再生骨料替代天然骨料的比例较小也会产生良好的效果，这两种混合料都具有代表性，以便确定它们之间的对比性能。这种替代百分比意味着自然资源（砾石）的大量节约，并保持了再生混凝土的平衡性能，因此这种新材料可被视为预制大体积混凝土铺路构件的可行且可靠的选择。对再生预制构件的特性进行了研究，包括力学、微观结构和耐久性性能，结果表明，与用传统混凝土工业生产的类似构件相比，其性能大多相似。
