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首页> 外文期刊>Resources, Conservation and Recycling >Use of recycled concrete aggregates from precast block for the production of new building blocks: An industrial scale study
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Use of recycled concrete aggregates from precast block for the production of new building blocks: An industrial scale study

机译：从预制块中使用再生混凝土聚集体进行新建筑块的生产：工业规模研究

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Large amounts of construction and demolition (C&D) waste are generated annually and will increase in the future. Until now, only a small fraction of concrete by-products is re-used as recycled concrete aggregates (RCA) for the manufacture of concrete. In this paper, the feasibility of using RCA obtained from old precast concrete block was investigated for the industrial scale production of new blocks. Concrete building blocks with different substitution rates (0%, 30% and 100%) of natural aggregates (NA) by the same volume fraction of RCA were manufactured in a factory and the mechanical properties and durability of concrete blocks were monitored. The results show that incorporating RCA slightly decreases the compressive strength and impairs the durability of concrete blocks. However, the compressive strength of concrete blocks made with 100% RCA could reach 11.1 MPa after 28 days, which is within the requirement in Belgian codes for this type of block. The concrete blocks produced with 30% and 100% of RCA reached the strength, capillary water absorption, drying shrinkage and freeze-thaw resistance requirements for concrete blocks specified by Belgian codes. A cradle-to-gate life cycle assessment (LCA) was performed on both "classical' blocks with only NA and with substitution of NA by RCA. When considering the additional use of RCA from a nearby C&D waste recycling centre, the substitution of 30% or 100% of NA by RCA led to a reduction in the land use category, in addition to supporting the implementation of the circular economy.
机译：每年生成大量建筑和拆除（C＆D）废物，将来会增加。到目前为止，只有一小部分的混凝土副产物被重新用作再生混凝土聚集体（RCA），用于制造混凝土。在本文中，研究了使用旧预制混凝土块获得的RCA的可行性，用于新块的工业规模生产。在工厂制造通过相同体积分数的不同替代率（0％，30％和100％）的自然聚集体（Na）的混凝土构建块在工厂制造，并监测混凝土块的机械性能和耐久性。结果表明，掺入RCA略微降低抗压强度并损害混凝土块的耐久性。然而，28天后，用100％RCA制造的混凝土块的抗压强度可以达到11.1MPa，这是在比利时代码的这种类型块的要求范围内。用30％和100％的RCA产生的混凝土嵌段达到了比利时守则规定的混凝土块的强度，毛细管吸水，干燥收缩和冻土电阻要求。摇篮到栅极寿命循环评估（LCA）是在“古典”块中进行的，只有NA和RCA替代NA。考虑到附近C＆D废物回收中心的额外使用RCA，替代30除了支持循环经济的实施之外，RCA的％或100％的NA通过RCA导致土地使用类别的减少。

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