Environmental life cycle assessment of concrete made with fine recycled concrete aggregates
Environmental life cycle assessment of concrete made with fine recycled concrete aggregates
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细再生混凝土骨料混凝土的环境生命周期评价
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Brito
中科院分区：
文献类型：
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作者：
L. Evangelista;J. Brito
世界上大多数结构都使用混凝土作为主要材料。这是因为混凝土在经济上是可行的，因为它的生产技术要求低，使用方便。然而，人们普遍认为混凝土生产对地球环境有很强的影响。天然骨料的使用是当今混凝土生产中最重要的问题之一，因为它们的资源有限，在一些国家是稀缺的。在葡萄牙，虽然有足够的采石场来满足今后几年粗骨料的需要，但细骨料的供应越来越少，特别是在该国北部。另一方面，由于混凝土结构的生命周期即将结束，迫切需要建立技术上和经济上可行的解决方案来处理拆除碎片，而不是用作道路基础和采石场填充料。本文介绍了部分生命周期评估（LCA）的混凝土由细再生混凝土骨料执行EcoConcrete工具。EcoConcrete是由联合项目组（JPG）在混凝土LCA上推广的一种量身定制的、互动的、学习和交流工具，旨在对混凝土产品的整体环境影响进行定性和量化。它由一个交互式的excel电子表格组成，其中几个环境输入（材料数量，从原产地到生产地点的距离，生产过程）和输出（材料，能源，对空气，水，土壤或废物的排放）被收集在一个生命周期清单中，然后被处理以确定分析混凝土的环境影响（评估），就臭氧层消耗，烟雾或“温室”效应而言。
The majority of worldwide structures use concrete as its main material. This happens because concrete is economically feasible, due to its undemanding production technology and ease of use. However, it is widely recognized that concrete production has a strong environmental impact in the planet. Natural aggregates use is one of the most important problems of concrete production nowadays, since they are obtained from limited, and in some countries scarce, resources. In Portugal, although there are enough stone quarries to cover coarse aggregates needs for several more years, supplies of fine aggregates are becoming scarcer, especially in the northern part of the country. On the other hand, as concrete structures’ life cycle comes to an end, an urgent need emerges to establish technically and economically viable solutions for demolition debris, other than for use as road base and quarry fill. This paper presents a partial life cycle assessment (LCA) of concrete made with fine recycled concrete aggregates performed with EcoConcrete tool. EcoConcrete is a tailor-made, interactive, learning and communications tool promoted by the Joint Project Group (JPG) on the LCA of concrete, to qualify and quantify the overall environment impact of concrete products. It consists of an interactive Excel-spreadsheet in which several environmental inputs (material quantities, distances from origin to production site, production processes) and outputs (material, energy, emissions to air, water, soil or waste) are collected in a life cycle inventory, and are then processed to determine the environmental impact (assessment) of the analysed concrete, in terms of ozone layer depletion, smog or “greenhouse” effect.