回弹超声角测综合法检测混凝土抗压强度研究  

Study on rebound ultrasonic angle measurement comprehensive method to detect compressive strength of concrete

作　　者：王大勇 WANG Dayong(Hebei Concrete Quality Testing Technology Innovation Center,Langfang Yangguang Construction Engineering Quality Testing Co.,Ltd.,Langfang 065000,China;Langfang Construction Engineering Quality Inspection Center,Langfang 065000,China)

机构地区：[1]廊坊市阳光建设工程质量检测有限公司河北省混凝土质量检测技术创新中心,廊坊065000 [2]廊坊市建设工程质量检测中心,廊坊065000

出　　处：《建筑结构》2021年第21期106-110,共5页Building Structure

摘　　要：为提高回弹超声角测综合法对结构混凝土抗压强度的检测精度,在足尺结构模型混凝土柱两相邻侧面测试超声角测法测区声速、相应单面测区回弹值与相应测区直径100mm标准芯样抗压强度。利用所测得的数据回归拟合得到标称能量2.207J中型回弹仪回弹超声角测综合法专用测强曲线,并与以超声对测法测区声速参数回归建立的超声回弹综合法测强曲线进行比较。结果表明,采用超声对测法测区声速参数回归建立的超声回弹综合法测强曲线计算超声角测法测区混凝土抗压强度存在较大误差;建立的标称能量2.207J中型回弹仪回弹超声角测综合法专用测强曲线具有足够检测精度,可用于强度等级C20~C70预拌泵送混凝土抗压强度检测;采用自制的角距仪装置可准确测量超声角测法测点所处位置及二面角角度,然后根据余弦定理精准计算超声角测法测点间距。In order to improve detection accuracy of concrete compressive strength of structure by rebound ultrasonic angle measurement comprehensive method,the sound velocity in the ultrasonic angle measurement area,the rebound value in the corresponding single side measurement area and the compressive strength of the standard core specimen with diameter of 100mm in the corresponding measurement area were tested on the two adjacent sides of the concrete column of full-scale structural models.The special strength curve of rebound ultrasonic angle measurement comprehensive method based on the nominal energy 2.207J rebound hammer was obtained by using the measured data regression fitting,and was compared with the strength curves of the ultrasonic rebound comprehensive method which was established by regressing sound velocity parameters in the measurement area of the ultrasonic contrast measurement method.The results show that if the strength curves of the ultrasonic rebound comprehensive method which was established by regressing sound velocity parameters in the measurement area of the ultrasonic contrast measurement method were used to calculate the concrete compressive strength in the ultrasonic angle measurement area,there would be large error.The special strength curve of rebound ultrasonic angle measurement comprehensive method based on the nominal energy 2.207J rebound hammer has enough detection accuracy,which could be used to detect the compressive strength of pumped concrete with strength grade of C20~C70.The self-made device for measuring angle and distance can accurately measure the position of measuring point of the ultrasonic angle measurement method and the dihedral angle,and then the distance between the measuring points of the ultrasonic angle measurement method can be accurately calculated according to the law of cosine.

关 键 词：回弹超声角测综合法 混凝土 抗压强度 角距仪 测强曲线 检测技术 

分 类 号：TU528􀆰[建筑科学—建筑技术科学]