title: Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes.
abstract: 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.
authors.affiliation: Construction Engineering, University of Cordoba, UCO-Ed, Leonardo Da Vinci, Campus of Rabanales, 14071 Cordoba, Spain.
authors.forename: Auxi
authors.initials: A
authors.lastname: Barbudo
authors.forename: Adela P
authors.initials: AP
authors.lastname: Galvín
authors.forename: Francisco
authors.initials: F
authors.lastname: Agrela
authors.forename: Jesús
authors.initials: J
authors.lastname: Ayuso
authors.forename: Jose Ramón
authors.initials: JR
authors.lastname: Jiménez
mesh_terms: D002133:Calcium Sulfate; D003252:Construction Materials / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis; D059027:Recycling; D012037:Refuse Disposal / Q000379:methods*; D012995:Solubility; D013431:Sulfates / Q000032:analysis* / Q000737:chemistry*
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D013431:Sulfates; D002133:Calcium Sulfate