Estimation Method of Characteristic Value of Concrete Strength in Situ Based on Single Sampling Inspection by Attributes
The rebound method has the advantages of no damage to the structural components,a large number of samples and flexible layout of the test area.However,the mean value and variance of the inspected strength may have a large deviation,so the accuracy of the strength characteristic value of the inspection batch estimated by the sampling inspection by variables is poor.According to the principle of single sampling inspection by attributes,based on the analysis and comparison of sampling characteristic curves,the estimation method of characteristic value of concrete strength of inspection batch is established considering that the acceptance probability of 0.1 unqualified product rate is 50%(the confidence level is 0.5).The comparison of sampling characteristic curves and case analysis show that the estimation results of the proposed method is basically equivalent to that of sampling inspection by variables based on Bayesian method.Suggestions are put forward for optimizing the layout of rebound test area when evaluating the strength of test batch concrete,as well as the core drilling correction method for inspection results of rebound method by sampling inspection by attributes.The proposed method has the characteristics of accurate probability definition,avoiding the assumption of strength distribution type and variance calculation,and reducing the number of core drilling checks.It can be used in engineering quality compliance assessment and existing structure safety assessment.
concrete strengthcharacteristic valuerebound methodcore drilling methodsampling inspection by attributessampling inspection by variables
万方数据
维普
