摘要
为探讨将废弃混凝土反复循环再生用作结构混凝土粗骨料的可行性,试验研究了5个系列普通混凝土经二次循环制备的再生混凝土粗骨料性能。分析了其矿物与化学成分,并依据不同的粗骨料质量等级标准对试验结果进行了等级评定。结果表明:随着循环次数增加,再生混凝土粗骨料表观密度、堆积密度与吸水率降低,压碎值、吸附的砂浆质量分数与微粉质量分数增大;第二次循环再生混凝土粗骨料性能指标趋于稳定,化学成分中CaO质量分数增大了49.7%,SiO2与Al2O3质量分数降低了33.90%与9.78%,满足RILEM、英国BS标准和国标GB/T 25177—2010中结构混凝土用粗骨料性能要求。
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 Al2O3and SiO2decrease 33. 90% and 9. 78%,which satisfythe performance requirements of coarse aggregate for structural concrete of RILEM,BS standard of the United Kingdom and GB / T 25177-2010.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2013年第6期960-964,共5页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(51278073)
江苏省六大人才高峰项目
常州大学自然科学基金(ZMF1002124)
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
structural concrete
recycled concrete
coarse aggregate
apparent density
bulk density
water absorption ratio
