Del Rey Isaac, Ayuso Jesús, Galvín Adela P, Jiménez José R, Barbudo Auxi
Construction Engineering, University of Córdoba, Ed. Leonardo Da Vinci, Campus of Rabanales, Córdoba 14071, Spain.
Materials (Basel). 2016 Nov 17;9(11):931. doi: 10.3390/ma9110931.
Social awareness aims to increase practical skills, such as sustainable development, which seeks to increase the use of different types of waste in construction activities. Although insufficient attention is sometimes given to these actions, it is essential to spread information regarding new studies in the field of waste recycling, which encourages and promotes waste use. Reusing and recycling construction waste in the creation of buildings and infrastructure are fundamental strategies to achieving sustainability in the construction and engineering sectors. In this context, the concept of waste would no longer exist, as waste would become a material resource. Therefore, this study analyses the behaviours of two unbound mixed recycled aggregates (MRA) in the structural layers of an unpaved rural road with low traffic (category T43). The sections were built on inappropriate soil (A-7-6) with a high degree of free swelling. The experimental road consisted of three sections: the first was made with natural aggregates (NA) that were used as a control, the second was composed of MRA in the subbase and NA in the base, and the third section was completely composed of MRA. The materials were characterised in the laboratory. The behaviours of the structural layers in the experimental road were determined by controlling compaction ("in situ" density and moisture) and measuring the deflections and load capacity (deflectometer) during the 18 months after construction. The results show that the sections made with recycled aggregates meet the technical specifications required by General Technical Specifications for Road and Bridge Works (PG-3). Therefore, the water-soluble sulphate content and Los Angeles abrasion coefficient limits can be increased for recycled aggregates without compromising the quality of this type of road with low traffic. To the best of our knowledge, this is the first study regarding the use of unbound MRA made from construction and demolition waste (CDW) in the construction of an unpaved rural road with low traffic on an expansive clay subgrade.
社会意识旨在提高实践技能，比如可持续发展，它力求在建筑活动中增加对不同类型废弃物的利用。尽管有时对这些行动关注不足，但传播有关废弃物回收领域新研究的信息至关重要，这能鼓励并促进废弃物的利用。在建筑和基础设施建设中重复利用和回收建筑垃圾是实现建筑和工程领域可持续发展的基本策略。在这种情况下，废弃物的概念将不复存在，因为废弃物将成为一种物质资源。因此，本研究分析了两种无结合料混合再生骨料（MRA）在低交通量（T43类）未铺砌乡村道路结构层中的性能。这些路段建在膨胀性高的不合适土壤（A - 7 - 6）上。试验道路由三个路段组成：第一个路段使用天然骨料（NA）作为对照，第二个路段底基层采用MRA，基层采用NA，第三个路段完全由MRA组成。这些材料在实验室进行了特性表征。通过控制压实（“现场”密度和含水量）以及在施工后的18个月内测量弯沉和承载能力（弯沉仪）来确定试验道路结构层的性能。结果表明，采用再生骨料的路段符合《公路桥涵施工技术规范》（PG - 3）要求的技术规格。因此，对于再生骨料，可以提高水溶性硫酸盐含量和洛杉矶磨耗系数限值，而不会影响这种低交通量道路的质量。据我们所知，这是第一项关于在膨胀性粘土地基上建设低交通量未铺砌乡村道路时使用由建筑拆除废弃物（CDW）制成的无结合料MRA的研究。
