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鄭宇煒

 

（青島大學附屬醫院 ，青島 266003)

摘   要 ：為提高全再生粗骨料混凝土的性能 ，實現廢棄混凝土資源最大化利用 ， 以粉煤灰  ( FA) 、鋼纖維(SF)  摻量為設計變量 ，開展全再生粗骨料混凝土力學強度 、吸水率 、氯離子滲透深度試驗 ，分析 FA 、SF 摻量變化對力學及耐久性能影響。結果表明：再生粗骨料混凝土抗壓 、劈裂抗拉強度隨 FA 摻量增加先增大后減小，隨 SF 摻量增加而增大 ；吸水率 、氯離子滲透深度隨 FA 摻量增加先減小后增大 ，隨 SF 摻量增加略有增大 ；15% FA 摻量時混凝土性能最佳 ，90 d 30% FA 摻量優于未摻 FA； 雙摻 FA 、SF 具有協同效應 ，可提高力學強度并緩解 SF 對耐久性不利影響 ，推薦采用 15% FA + 1 . 0% FS 的摻量組合。研究成果可為全再生粗骨料混凝土的配合比設計提供參考。

關鍵詞：全再生粗骨料混凝土 ；粉煤灰 ；鋼纖維 ；力學性能 ；耐久性能

中圖分類號：TU528           

文獻標志碼：A           

文章編號： 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

作者簡介： 鄭宇煒  (1972—) ,   男 ，本科 ， 高級工程師 ，研究方向： 醫院建筑建設及維護。

收稿日期：2025 - 05 - 15