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CHARACTERIZATION OF BRAZILIAN CONSTRUCTION AND DEMOLITION WASTE COARSE RECYCLED AGGREGATE


This article aims to apply the combination of heavy media and hand sorting in representative samples of Brazilian CDW aggregates from two different recycling plants and to characterize relevant fractions by chemical, mineralogical and physical tests. Three national CDW coarse recycled aggregates were sampled, sieved, separated in four heavy media classes (d < 1.9; 1.9 < d < 2.2;2.2 < d < 2.5;d > 2.5 g/cm~3), sorted by hand sorting and chemically, mineralogically and physically characterized. The results show that Brazilian mixed coarse recycled aggregates are mainly constituted of silicates. The presence of Portland cement was secondary. All studied samples do not comply with RILEM aggregate specification for concrete > 50 MPa. In heavy media separation, tectosilicates (rocks and natural gravels) are separated when d > 2.5 g/cm~3. A mixture of tectosilicates, phyllosilicates and carbonates from cement-based and ceramic particles mainly composes the other heavy media classes. The hand sorting method sorts recycled aggregates only by its phase. As a result, cement-based and ceramic particles have significant physical aggregate property variability. Using both methods guarantee best results in terms of homogeneity of physical aggregate properties. For all studied samples, it was possible to establish a correlation between the amount of binders and the aggregate bulk specific gravities.......

【作者名称】: Sergio C. Angulo, Carina Ulsen, Priscila M. Carrijo, Raquel M. Silva, Vanderley M. John, Henrique Kahn
【作者单位】: Department of Civil Construction, Escola Politecnica, University of Sao Paulo, Brazil
【关 键 词】: construction and demolition waste, recycled aggregates, heavy media separation, hand sorting, normalization, quality control
【会议名称】: RILEM Proceedings PRO 40; International RILEM Conference on the Use of Recycled Materials in Buildings and Structures vol.1; 20041108-11; Barcelona(ES)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 101,629,258
【摘要长度】: 1,405
【会议地点】: Barcelona(ES)
【会议组织】: Department of Civil Construction, Escola Politecnica, University of Sao Paulo, Brazil
【会议时间】: 2004
【上篇论文】: 外文会议 - STRUCTURAL STEEL - THE PREFERRED CHOICE FOR BUiLDABSLITY
【下篇论文】: 外文会议 - Meeting Multiple Challenges on a Small Site with Advanced Membrane Filtration and Granular Activated Carbon

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