硅酸盐通报2025，Vol.44Issue(1)：264-273,10.DOI:10.16552/j.cnki.issn1001-1625.2024.0787
钢纤维自密实再生混凝土的力学性能
Mechanical Properties of Steel Fiber Reinforced Self-Compacting Concrete with Recycled Aggregate
摘要
Abstract
Self-compacting concrete with recycled aggregate(RASCC)with 100％(mass fraction)recycled aggregate(RA)is an environmentally friendly and green building material with high workability,which limits its engineering application due to its lower strength than pure natural concrete.The mechanical properties of RASCC were improved by incorporating steel fiber,and compressive,split tensile and flexural tests were carried out to investigate the optimum steel fiber volume fraction Vf and length-to-diameter ratio Lf/df,and to compare the mechanical properties of RASCC under different RA replacement rates at the optimum Vf and Lf/df.The results show that the effects of Vf and Lf/df on the flowability of steel fiber reinforced self-compacting concrete with recycled aggregate(SFRASCC)are greater than those of RA substitution rate.Compared with RASCC without steel fiber,the best enhancement of cubic compressive strength is achieved at 0.25％Vf,which increases by 20.9％,whereas the best enhancement of split tensile strength and flexural strength is achieved at 0.50％Vf,which increases by 50.0％and 58.3％,respectively.Compared with the RASCC without steel fiber,the best improvement in cubic compressive strength is achieved when Lf/df is 33.3,while the best improvement in split tensile strength and flexural strength is achieved when Lf/df is 63.6.In the case of steel fiber volume fraction and appropriate aspect ratio,it is feasible to use 30％RA or 100％RA to replace the natural aggregate,but it is more environmentally friendly to use the replacement rate of 100％RA.The established formulae for the compressive strength and split tensile strength of SFRASCC cubes can be used for reference.关键词
自密实混凝土/再生混凝土/抗压强度/劈裂抗拉强度/钢纤维Key words
self-compacting concrete/recycled aggregate concrete/compressive strength/split tensile strength/steel fiber分类
建筑与水利引用本文复制引用
余芳,李林柏,姚大立..钢纤维自密实再生混凝土的力学性能[J].硅酸盐通报,2025,44(1):264-273,10.基金项目
国家自然科学基金(51608331) （51608331）
辽宁省科技厅基金(2022-MS-270) （2022-MS-270）
辽宁省教育厅基金(LJKZ0149,LJKZ0151) （LJKZ0149,LJKZ0151）
