流体机械2024，Vol.52Issue(12)：31-38,8.DOI:10.3969/j.issn.1005-0329.2024.12.005
射流压力对混凝土粗骨料分离效率及性质的影响
Effect of jet pressure on the separation efficiency and properties of the recycled coarse aggregate
摘要
Abstract
In order to crush and separate the recycled coarse aggregate(RCA)from the waste concrete(WC),a new method of crushing the concrete and separating the coarse aggregate by using water jet technology was proposed,and the numerical simulation and experimental research on the separation of coarse aggregate from the crushed concrete by water jet were carried out,and the basic properties,2D and 3D morphology,particle shape characteristics and compressive strength of RCA under different jet pressures were explored.The results show that,compared with the mechanical method,the residual adhesion mortar content and needle flake content of water jet RCA are reduced by 53%and 68%,the apparent density is increased by 1.7%,and the porosity and water absorption rate are reduced by 3%and 41%,respectively,which can reach Class I in the national standard.The crushing degree of coarse aggregate by water jet impact is within the acceptable range,and the average particle size of RCA is only about 7%lower than that of natural coarse aggregate.When the RCA is mixed into the recycled aggregate concrete specimen at 30%,40%and 50%respectively,the compressive strength of the waterjet RCA concrete is increased by 5.8%,22.7%and 17.7%respectively compared with the traditional mechanical RCA concrete.This study can provide a theoretical basis for the application of water jet in concrete crushing and reuse.关键词
废弃混凝土/高压水射流/粗骨料分离/再生粗骨料Key words
waste concrete/high-pressure water jets/coarse aggregate separation/recycled coarse aggregate分类
机械制造引用本文复制引用
王泽峰,李雅诗,蒋宇涛,潘超,唐杰..射流压力对混凝土粗骨料分离效率及性质的影响[J].流体机械,2024,52(12):31-38,8.基金项目
湖北省重点研发计划项目(2023BCB044) （2023BCB044）
国家自然科学基金项目(52108169) （52108169）
武汉科技大学"十四五"湖北省优势特色学科(群)项目(2023D0503,2023D0501) （群）
湖北省建设科技计划项目(2022070) （2022070）
