南京理工大学学报（自然科学版）Issue(6)：960-964,5.
结构混凝土用循环再生混凝土粗骨料性能研究
Properties of repeatedly recycled coarse aggregate for structural concrete
摘要
Abstract
To evaluate the feasibility of using the repeatedly recycled concrete as the coarse aggregate for structural concrete,the properties of recycled coarse aggregate prepared by recirculation of five series of natural aggregate concrete mixtures are researched. Their mineral and chemical compositions are analyzed,and the experimental results are graded according to different quality grade standards of coarse aggregate. The results show:with the increase of the recycling number,the apparent density, bulk density and water absorption ratio of the recycled coarse aggregate reduce,and the mass fraction of the attached mortar content and powder content and the crushing value increase. The performance indexes of the second repeatedly recycled coarse aggregate are steady. The mass fraction of CaO increases 49. 7%,the mass fractions of Al2 O3 and SiO2 decrease 33. 90% and 9. 78%,which satisfy the performance requirements of coarse aggregate for structural concrete of RILEM, BS standard of the United Kingdom and GB/T 25177-2010 .关键词
结构混凝土/再生混凝土/粗骨料/表观密度/堆积密度/吸水率Key words
structural concrete/recycled concrete/coarse aggregate/apparent density/bulk density/water absorption ratio分类
建筑与水利引用本文复制引用
朱平华,王新杰,伍君勇,陈春红..结构混凝土用循环再生混凝土粗骨料性能研究[J].南京理工大学学报（自然科学版）,2013,(6):960-964,5.基金项目
国家自然科学基金(51278073) （51278073）
江苏省六大人才高峰项目 （）
常州大学自然科学基金(ZMF1002124) （ZMF1002124）
