Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes
- 作者：Auxi Barbudo ; Adela P. Galví ; n ; apgalvin@uco.es ; Francisco Agrela ; Jesú ; s Ayuso ; Jose Ramó ; n Jimé ; nez
- 关键词：Construction and demolition waste ; Recycled aggregate ; Soluble sulphate ; Leaching ; Heavy metals ; Pollution
- 刊名：Waste Management
- 出版年：2012
- 期刊代码：70_0956053x
- 类别：env
- 出版时间：June, 2012
- 卷：32
- 期：6
- 页码：1229-1235
- 文件大小：341 K
摘要
In some recycled aggregates applications, such as component of new concrete or roads, the total content of soluble sulphates should be measured and controlled. Restrictions are usually motivated by the resistance or stability of the new structure, and in most cases, structural concerns can be remedied by the use of techniques such as sulphur-resistant cements. However, environmental risk assessment from recycling and reuse construction products is often forgotten. The purpose of this study is to analyse the content of soluble sulphate on eleven recycled aggregates and six samples prepared in laboratory by the addition of different gypsum percentages. As points of reference, two natural aggregates were tested. An analysis of the content of the leachable amount of heavy metals regulated by European regulation was included. As a result, the correlation between solubility and leachability data allow suggest a limiting gypsum amount of 4.4%on recycled aggregates. This limit satisfies EU Landfill Directive criteria, which is currently used as reference by public Spanish Government for recycled aggregates in construction works.