Abstract

This study had a triple environmental objective. First, to reuse various industrial wastes (i.e., bottom ash, slag, and construction and demolition waste) as coarse aggregates in porous concretes. Second, to develop a material capable of eliminating noise, another environmental pollutant, in acoustic barriers. The third objective was to produce construction materials composed primarily of wastes with no impact on the environment or human health (regarding the leaching of heavy metals). We conducted several tests of recycled porous concretes to determine if they can be used as raw material to produce highway noise barriers. The tests dealt with physical (open void ratio, bulk density) mechanical (compressive strength), acoustic (sound absorption coefficient) and leaching properties. We analyzed the influence of particle size. We found that the source of the waste does not affect the sound absorption properties if the particle size is similar. However, the source of the waste slightly influences the mechanical properties and substantially affects the leaching of the final product. Hence, different wastes can be compounded to manufacture porous concrete if they do not pose problems of heavy metal leaching.

摘要

这项研究有一个三重环境目标。首先，将各种工业废物（即底灰、矿渣、建筑和拆除废物）作为粗骨料再利用到多孔混凝土中。其次，开发一种能够消除声屏障中的另一种环境污染物噪音的材料。第三个目标是生产主要由废物组成的建筑材料，不会对环境或人类健康产生影响（关于重金属的浸出）。我们对再生多孔混凝土进行了多次测试，以确定它们是否可以用作生产高速公路隔音屏障的原材料。测试涉及物理（开放空隙率、体积密度）、机械（抗压强度）、声学（吸声系数）和浸出性能。我们分析了粒度的影响。我们发现，如果颗粒大小相似，废物的来源不会影响吸声性能。然而，废物的来源对机械性能有轻微影响，但对最终产品的浸出有很大影响。因此，如果不同的废物不会造成重金属浸出问题，则可以将它们混合来制造多孔混凝土。