超声回弹综合法检测负温商品混凝土实体抗压强度研究

Study on the Testing of Compressive Strength of Negative Temperature Merchandise Concrete by Ultrasonic-Rebound Combined Method

在寒冷地区冬期负温环境成型的大型实体结构模型上进行超声声速值、回弹值和碳化深度值测试,以芯样抗压强度为拟合因变量,分别建立了负温、转正温后及负温—正温全历程的超声回弹综合法实体测强曲线,对这三类综合法测强曲线的回归误差进行对比分析。最后通过工程检测数据对所建立曲线进行验证对比。结果表明,负温—正温全历程综合法测强曲线具有较高的检测精度,能够用于负温实体混凝土抗压强度的检测。

Ultrasonic speed,rebound values and the deepness of carbonization are acquired from the large scale simulation structure models into which merchandise concrete was pumped at negative temperature in cold area.Taking standard core specimen as dependent variable,Ultrasonic-rebound curves considering the negative temperature period,positive temperature and through temperature histories are established,the regression error of three kinds of curve is analyzed and contrasted.At last,the actual engineering test data are utilized to validate that the ultrasonic-rebound curve is of more effective precision.