Upgrading the quality of mixed recycled aggregates from construction and demolition waste by using near-infrared sorting technology

被引：88

作者：

Vegas, Inigo ^{[1
]}

Broos, Kris ^{[2
]}

Nielsen, Peter ^{[2
]}

Lambertz, Oliver ^{[3
]}

Lisbona, Amaia ^{[1
]}

机构：

[1] TECNALIA, Derio 28160, Spain

[2] Flemish Inst Technol Res VITO, Unit Sustainable Mat Management, B-2400 Mol, Belgium

[3] TOMRA Sorting GmbH, D-56218 Mulheim, Germany

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 75卷

基金：

欧盟第七框架计划;

关键词：

Construction and demolition waste (C&DW); Recycling technologies; Near Infrared (NIR); Leaching; Recycled aggregates; CONCRETE; CLASSIFICATION; BEHAVIOR; REMOVAL; MORTAR;

D O I：

10.1016/j.conbuildmat.2014.09.109

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Recycled aggregates of high-purity, guaranteeing optimal technical and environmental performance, are required for high-grade construction applications such as concrete. The main problem constituents causing a decrease in the quality of recycled aggregates to be used in high grade applications are: organic material, gypsum and autoclaved aerated concrete (AAC). This paper studies the potential of Near Infrared (NIR) sorting technology to improve the quality of mixed recycled aggregates. Tests were carried out by using samples of mixed recycled aggregates collected in different EU countries (Germany, Sweden, Spain and Italy). Constituents, total sulphur content, acid soluble sulphates, total heavy metals and metal leaching were determined before and after the use of the NIR sorting technology. The results clearly indicate that the problematic fractions (organic material, gypsum and AAC) in the mixed recycled aggregates can be significantly reduced or even eliminated during the NIR sorting treatment, boosting a greater use of recycled aggregates in high grade applications such as concrete manufacturing. (C) 2014 Published by Elsevier Ltd.

引用

页码：121 / 128

页数：8

共 56 条

[1] Limiting properties in the characterisation of mixed recycled aggregates for use in the manufacture of concrete [J].