钦州地区超声回弹综合法测强曲线研究  

Reseach on ultrasonic rebound intensity curve in Qinzhou area

作　　者：邢心魁[1,2,3] 仇诗庄 覃荷瑛 XING Xinki;QIU Shizhuang;IN Heying(School of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Collaborative Innovation Center for Exploration and Material Development of Non-ferrous Concealed Deposits,Guilin 541004,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西有色金属隐伏矿床勘察及材料开发协同创新中心,广西桂林541004 [3]广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《混凝土》2024年第5期117-121,共5页Concrete

基　　金：国家自然科学基金(51768014);广西创新驱动发展专项(桂科AA20302006)。

摘　　要：采用了钦州地区广泛使用的砂石材料、水泥和水胶比等,预制了4种不同强度等级(C25、C30、C35、C40)的混凝土试块,标准养护28 d后,对试块开展回弹、超声和抗压试验,并对试验结果进行分析。由分析结果可知,全国统一测区超声回弹综合法碎石骨料曲线式在钦州地区使用时误差较大。根据《超声回弹综合法检测混凝土强度技术规程》,采用计算模型——多项式函数f_(cu)^(n)=aV+bR+c与幂函数f_(cu)^(n)=aV^(b)R^(c),对综合法测强回归曲线进行拟合,初步建立钦州地区混凝土抗压强度的测强回归曲线,对实际工程有一定的参考意义。Four concrete specimens of different strength classes,C25,C30,C35 and C40,were prefabricated using the widely used sand and gravel materials,cement and proportion of mixture in Qinzhou area,and after standard curing for 28 days,rebound,ultrasonic and compressive tests were carried out on the test specimens respectively,and it was concluded that the formula of ultrasonic rebound integrated method gravel aggregate curve in the national has a large error when used in Qinzhou area.According to the polynomial function f_(cu)^(n)=aV+bR+c and power function f_(cu)^(n)=aV^(b)R^(c) recommended in the regulation for the fitting of the integrated method strength measurement regression curve,the preliminary establishment of the strength measurement regression curve of the compressive strength of concrete in the Qinzhou area,which has some reference significance to the actual project.

关 键 词：无损检测 强度曲线 超声回弹综合法 回归曲线拟合 

分 类 号：TU528.07[建筑科学—建筑技术科学]