掺循环流化床底灰的钢管混凝土界面粘结性能

Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash.

作者信息

Liu Lan, He Lei, Cheng Zhi, Wang Xiaoyi, Ma Zhe, Cheng Xinrong

机构信息

School of Science, North University of China, Taiyuan 030051, China.

出版信息

Materials (Basel). 2021 Mar 20;14(6):1529. doi: 10.3390/ma14061529.

DOI:10.3390/ma14061529

PMID:33804760

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8004054/

Abstract

The interface bonding behavior between the steel tube and the concrete of concrete-filled steel tube (CFST) blended with circulating fluidized bed bottom ash (CFB-BA) was investigated in this study. A total of 8 groups of CFSTs stub columns were prepared with different dosage of CFB-BA, water-binder ratio (W/B), and interface bonding length. A series of push-out tests were carried out to acquire the data representing the interface bonding behavior. The results show that the dosage of CFB-BA has a direct effect on interface bonding behavior of CFST. CFB-BA can improve the interface bonding behavior of CFST. The highest ultimate bonding load and strength are achieved when the dosage of CFB-BA is 30%. When the dosage of CFB-BA increases to 50%, its interface bonding behavior decreases, but is still better than that of CFST without CFB-BA. W/B has a negative correlation with the interface bonding behavior of CFST. While the W/B increases, the interface bonding load and strength of CFST decreases. The increase of the interface bonding length can improve the interface bonding load, but cannot improve the interface bonding strength.

摘要

本研究对掺加循环流化床底灰（CFB - BA）的钢管混凝土（CFST）中钢管与混凝土之间的界面粘结性能进行了研究。共制备了8组不同CFB - BA掺量、水胶比（W/B）和界面粘结长度的CFST短柱。进行了一系列推出试验以获取代表界面粘结性能的数据。结果表明，CFB - BA掺量对CFST的界面粘结性能有直接影响。CFB - BA可以改善CFST的界面粘结性能。当CFB - BA掺量为30%时，达到最高极限粘结荷载和强度。当CFB - BA掺量增加到50%时，其界面粘结性能下降，但仍优于未掺CFB - BA的CFST。水胶比对CFST的界面粘结性能呈负相关。随着水胶比的增加，CFST的界面粘结荷载和强度降低。界面粘结长度的增加可以提高界面粘结荷载，但不能提高界面粘结强度。