Life Cycle Assessment of Completely Recyclable Concrete.
Life Cycle Assessment of Completely Recyclable Concrete.
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DOI：
10.3390/ma7086010
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发表时间：
2014-08-21
期刊：
影响因子：
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通讯作者：
De Belie N
中科院分区：
文献类型：
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作者：
De Schepper M;Van den Heede P;Van Driessche I;De Belie N
由于建筑行业使用了地球上50%的原材料，并产生了50%的废物，因此开发更耐用和可持续的建筑材料至关重要。今天，建筑和拆除废物（CDW）主要用于低水平应用，即作为基础的非结合材料，例如，在道路建设中。矿物拆除废物可以回收作为混凝土的碎骨料，但由于吸水率较高，这些碎骨料降低了抗压强度并影响了工作性。为了促进混凝土碎石的使用，完全可回收混凝土（CRC）被设计用于水泥生产中的再生，遵循从摇篮到摇篮（C2C）的原则。通过设计，CRC成为水泥生产的资源，因为CRC的化学成分将与水泥原料的化学成分相似。如果定期使用CRC，将产生一个封闭的混凝土-水泥-混凝土材料循环，这与传统混凝土目前的生命周期完全不同。在对这一CRC的研究中，重要的是要量化对环境的好处，需要进行生命周期评估（LCA），其结果在本文中介绍。据观察，CRC可以显著降低混凝土的全球变暖潜力。
Since the construction sector uses 50% of the Earth’s raw materials and produces 50% of its waste, the development of more durable and sustainable building materials is crucial. Today, Construction and Demolition Waste (CDW) is mainly used in low level applications, namely as unbound material for foundations, e.g., in road construction. Mineral demolition waste can be recycled as crushed aggregates for concrete, but these reduce the compressive strength and affect the workability due to higher values of water absorption. To advance the use of concrete rubble, Completely Recyclable Concrete (CRC) is designed for reincarnation within the cement production, following the Cradle-to-Cradle (C2C) principle. By the design, CRC becomes a resource for cement production because the chemical composition of CRC will be similar to that of cement raw materials. If CRC is used on a regular basis, a closed concrete-cement-concrete material cycle will arise, which is completely different from the current life cycle of traditional concrete. Within the research towards this CRC it is important to quantify the benefit for the environment and Life Cycle Assessment (LCA) needs to be performed, of which the results are presented in a this paper. It was observed that CRC could significantly reduce the global warming potential of concrete.