预制混凝土梁超声波声速与密实度的关系试验研究  

Experimental Study on Relationship Between Ultrasonic Speed and Compactness of Precast Concrete Girder

作　　者：李学斌 马林 吕启兵[2] 杨心怡 文云杰 李玉[4] 何勇[4] 田晓旺 LI Xuebin;MA Lin;LYU Qibin;YANG Xinyi;WEN Yunjie;LI Yu;HE Yong;TIAN Xiaowang(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Sinohydro Engineering Bureau 7 Corporation Limited,Chengdu 610213,China;China Railway No.3 Engineering Group Co.Ltd.,Taiyuan 030001,China;China Railway First Group Co.Ltd.,Xi’an 710054,China;Shanghai Civil Engineering Co.Ltd.of CREC,Shanghai 201906,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国水利水电第七工程局有限公司,成都610213 [3]中铁三局集团有限公司,太原030001 [4]中国中铁一局集团有限公司,西安710054 [5]中铁上海工程局集团有限公司,上海201906

出　　处：《铁道建筑》2022年第4期73-76,共4页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2020YJ037)

摘　　要：介绍了混凝土超声法的测试原理和方法,分析了影响混凝土超声波声速的因素。通过分析铁路32 m跨度预制简支箱梁混凝土声速试验以及混凝土试件声速、强度测试结果,研究混凝土声速与密实度和强度的关系。结果表明:铁路C50混凝土简支箱梁的超声波声速在4600 m/s以上时,可认为混凝土的密实度较好,其强度可以达到50 MPa的要求。梁体浇筑时应加强预应力管道附近混凝土的振捣施工,保证该区域混凝土的密实度。The principle and method of ultrasonic testing of concrete were introduced.The factors influencing ultrasonic speed of concrete were analyzed.Through the analysis of the test results of concrete sound speed of 32 m precast simple supported box girder and the sound speed and strength of concrete specimens,the relationship between the sound speed and the compactness and strength was studied.The results show that when the ultrasonic speed of railway C50 concrete simply supported box girder is more than 4600 M/s,it can be considered that the compactness of concrete is good,and its strength can meet the requirements of 50 MPa.The construction of concrete vibrating near the prestressed ducts should be strengthened to ensure the compactness of concrete in this area during concrete pouring.

关 键 词：预制梁 超声波 声速 密实度 强度 无损检测 

分 类 号：U448.33[建筑科学—桥梁与隧道工程]