摘要
[目的]由于受到荷载和环境因素的影响,服役时间较长的混凝土结构劣化现象严重.在不破坏结构且不影响其使用的前提下,及时准确测定混凝土强度对评价桥梁的安全性至关重要.[方法]本研究采用回弹法、超声回弹综合法、后锚固法、钻芯法等4种检测方法,在现场检测9个长龄期混凝土构件的混凝土强度,并做对比分析.[结果]回弹法(国家测强曲线)、回弹法(地方测强曲线)、超声回弹综合法(国家测强曲线)、超声回弹综合法(地方测强曲线)、后锚固法与钻芯法的平均误差分别-6.69%、+29.65%、+10.65%、+46.81%、+7.53%.[结论]研究发现,通过采用回弹法与超声回弹综合法得出地方曲线的强度换算值均高于国家曲线的强度换算值.
Abstract
[Purposes]Concrete structures in service for a long period of time suffer serious deterioration due to loads and environmental factors.Without destroying the structure and affecting its use,timely and accurate determination of concrete strength is crucial for evaluating the safety of bridges.[Methods]In this study,four testing methods,namely,rebound method,ultrasonic rebound synthesis method,post-anchorage method,and core drilling method,were used to test the concrete strength of nine long-service concrete members in the field and make comparative analysis.[Findings]The average errors of the re-bound method(national strength curve),rebound method(local strength curve),ultrasonic rebound syn-thesized method(national strength curve),ultrasonic rebound synthesized method(local strength curve),post-anchorage method and core drilling method were-6.69%,+29.65%,+10.65%,+46.81%and+7.53%respectively.[Conclusions]It was found that the strength conversion values of the local curves derived by using the rebound method and the ultrasonic rebound synthesis method were higher than those of the national curves.
基金项目
云南省交通运输厅科技项目(云交科教便[2020]91号)
NETL
NSTL
万方数据