PDF全文阅读

郑宇炜

 

（青岛大学附属医院 ，青岛 266003)

摘   要 ：为提高全再生粗骨料混凝土的性能 ，实现废弃混凝土资源最大化利用 ， 以粉煤灰  ( FA) 、钢纤维(SF)  掺量为设计变量 ，开展全再生粗骨料混凝土力学强度 、吸水率 、氯离子渗透深度试验 ，分析 FA 、SF 掺量变化对力学及耐久性能影响。结果表明：再生粗骨料混凝土抗压 、劈裂抗拉强度随 FA 掺量增加先增大后减小，随 SF 掺量增加而增大 ；吸水率 、氯离子渗透深度随 FA 掺量增加先减小后增大 ，随 SF 掺量增加略有增大 ；15% FA 掺量时混凝土性能最佳 ，90 d 30% FA 掺量优于未掺 FA； 双掺 FA 、SF 具有协同效应 ，可提高力学强度并缓解 SF 对耐久性不利影响 ，推荐采用 15% FA + 1 . 0% FS 的掺量组合。研究成果可为全再生粗骨料混凝土的配合比设计提供参考。

关键词：全再生粗骨料混凝土 ；粉煤灰 ；钢纤维 ；力学性能 ；耐久性能

中图分类号：TU528           

文献标志码：A           

文章编号： 1005- 8249   (2025)  05- 0049- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .05 .010

 

ZHENG Yuwei

(The Affiliated Hospital of Qingdao University , Qingdao 266003 , China)

Abstract : In order to improve the performance of fully recycled coarse aggregate concrete and maximize the use of waste concrete resources , the mechanical strength , water absorption , and chloride ion penetration depth tests of fully recycled coarse aggregate concrete were carried out with the mixing amounts of fly ash  (FA)  and  steel fibers  (SF) as  the  design variables to analyze the effects of the changes in the mixing amounts of FA and SF on the mechanical and durability performance . The results  show that : the compressive and split tensile strength of recycled coarse aggregate concrete increases and then decreases with the increase of FA dosage , and increases with the increase of SF dosage;  water absorption , chloride  ion penetration depth decreases and then increases with the increase of FA dosage , and slightly increases with the  increase  of SF dosage; 15%  FA  dosage has  the best performance of the concrete , and 30%  FA dosage in 90  d is better than that of unadulterated FA; the double - dosing of FA and SF has a synergistic effect ,  which can improve the mechanical strength and alleviate the effects of SF dosage . The double mixing of FA and SF has  synergistic  effect , which  can  improve  the  mechanical  strength  and  alleviate  the  unfavorable effect of  SF  on durability , and  it  is  recommended  to  use the mixing combination of  15%  FA  +  1 . 0% FS .  The results of  the research can provide reference for the proportion design of fully recycled coarse aggregate concrete .

Key words :  fully recycled coarse aggregate concrete;  fly ash;  steel fibre;  mechanical property;  durability

作者简介： 郑宇炜  (1972—) ,   男 ，本科 ， 高级工程师 ，研究方向： 医院建筑建设及维护。

收稿日期：2025 - 05 - 15