长龄期混凝土构件强度现场检测对比试验研究  

Long-Term Concrete Structural Strength Field Comparison Test Study

作　　者：康鹏 陈顺超[1] 刘杰[1] 宋帅 聂良鹏 游鹏升 KANG Peng;CHEN Shunchao;LIU Jie;SONG Shuai;NIE Liangpeng;YOU Pengsheng(Southwest Forestry University,Kunming 650224,China;Yunnan Thorounghfare Engineering Testing Co.,Ltd.,Kunming 650200,China)

机构地区：[1]西南林业大学,云南昆明650224 [2]云南通衢工程检测有限公司,云南昆明650200

出　　处：《河南科技》2024年第13期55-60,共6页Henan Science and Technology

基　　金：云南省交通运输厅科技项目(云交科教便〔2020〕91号)。

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。[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,postanchorage 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 rebound method(national strength curve),rebound method(local strength curve),ultrasonic rebound synthesized 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.

关 键 词：长龄期混凝土 抗压强度 无损检测 对比试验 

分 类 号：TU443[建筑科学—岩土工程]