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。
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.
作者
郑宇炜
ZHENG Yuwei(The Affiliated Hospital of Qingdao University,Qingdao 266003,China)
出处
《粉煤灰综合利用》
2025年第5期49-54,共6页
Fly Ash Comprehensive Utilization
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
fully recycled coarse aggregate concrete
fly ash
steel fibre
mechanical property
durability
