Del Valle-Zermeño R, Chimenos J M, Giró-Paloma J, Formosa J
Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat de Barcelona (UB), Martí i Franqués, 1, 08028 Barcelona, Spain.
Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat de Barcelona (UB), Martí i Franqués, 1, 08028 Barcelona, Spain.
Chemosphere. 2014 Dec;117:402-9. doi: 10.1016/j.chemosphere.2014.07.095. Epub 2014 Sep 1.
The presence of neoformed cement-like phases during the weathering of non-stabilized freshly quenched bottom ash favors the development of a bound pavement material with improved mechanical properties. Use of weathered and freshly quenched bottom ash mix layers placed one over the other allowed the retention of leached heavy metals and metalloids by means of a reactive percolation barrier. The addition of 50% of weathered bottom ash to the total subbase content diminished the release of toxic species to below environmental regulatory limits. The mechanisms of retention and the different processes and factors responsible of leaching strongly depended on the contaminant under concern as well as on the chemical and physical factors. Thus, the immediate reuse of freshly quenched bottom ash as a subbase material in road constructions is possible, as both the mechanical properties and long-term leachability are enhanced.
在未稳定化的新鲜淬火底灰风化过程中，新形成的水泥状相的存在有利于开发具有改善力学性能的粘结路面材料。使用一层叠一层放置的风化底灰和新鲜淬火底灰混合层，通过反应性渗透屏障实现了对浸出重金属和类金属的保留。在总底基层含量中添加50%的风化底灰可将有毒物质的释放降低到环境监管限值以下。保留机制以及负责浸出的不同过程和因素在很大程度上取决于所关注的污染物以及化学和物理因素。因此，新鲜淬火底灰作为道路建设中的底基层材料立即再利用是可行的，因为其力学性能和长期浸出性都得到了提高。
