کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4471812 1315044 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes
چکیده انگلیسی

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.


► Soluble sulphates (from gypsum drywall) are a limiting factor in recycling of C&DW.
► Various samples were artificially prepared with different gypsum percentages.
► The pollution potential due to sulphate and heavy metals is studied.
► We analyze the correlation between solubility and leaching of sulphates.
► As a result, a limiting gypsum amount in a recycled aggregate is suggested.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 32, Issue 6, June 2012, Pages 1229–1235
نویسندگان
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